Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "Heavy Metal" wg kryterium: Temat

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 410
Tytuł:
Crosslinked poly(hydroxybutyl acrylate-co-acrylamide) based hydrogels : synthesis, characterization, and performance evaluation in heavy metal removal
Hydrożele na bazie usieciowanego poli(akrylanu hydroksybutylo-co-akrylamidu) : synteza, charakterystyka i ocena zdolności do usuwania metali ciężkich
Autorzy:
Abdallah, Zahraa Saadi
Mohammed, Ameen Hadi
Powiązania:
https://bibliotekanauki.pl/articles/24202779.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
superabsorbent polymer
hydroxybutyl acrylate
acrylamide
adsorption properties
heavy metal ions removal
polimery superchłonne
akrylan hydroksybutylu
akryloamid
właściwości adsorpcyjne
usuwanie jonów metali ciężkich
Opis:
By radical polymerization, two series of superabsorbent hydrogels of hydroxybutyl acrylate and acrylamide copolymers, poly(HBA-co-AAm), were obtained. In the first series, the ratio of hydroxybutyl acrylate to acrylamide was optimized with a constant amount of methylene bisacrylamide (MBA) as a cross-linking agent. In the second series, the amount of MBA was changed at a fixed monomer ratio. The structure of the copolymers was confirmed by the FTIR method. Swelling parameters and mechanical properties were tested. Hydrogels with a high Young’s modulus and a high degree of swelling were selected for the study of adsorption properties towards Co2+, Ni2+ and Cd2+ ions. The influence of basic factors such as adsorbent dose, exposure time and pH on adsorption efficiency was also investigated. The ability to adsorb heavy metal ions changed as follows: Co2+> Ni2+> Cd2+.
Metodą polimeryzacji rodnikowej otrzymano dwie serie superchłonnych hydrożeli kopolimerów akrylanu hydroksybutylu i akryloamidu, poli(HBA-co-AAm), otrzymano. W pierwszej serii optymalizowano stosunek akrylanu hydroksybutylu do akryloamidu przy stałej ilości metylenobisakryloamidu (MBA) jako czynnika sieciującego. W drugiej serii przy ustalonym stosunku monomerów zmieniano ilość MBA. Strukturę kopolimerów potwierdzono metodą FTIR. Zbadano parametry pęcznienia oraz właściwości mechaniczne. Do badań właściwości adsorpcyjnych w stosunku do jonów Co2+, Ni2+ i Cd2+ wytypowano hydrożele o wysokim module Younga i wysokim stopniu pęcznienia. Zbadano również wpływ podstawowych czynników, takich jak dawka adsorbentu, czas ekspozycji i pH na efektywność adsorpcji. Zdolność do adsorpcji jonów metali ciężkich zmieniała się następująco: Co2+> Ni2+> Cd2+.
Źródło:
Polimery; 2023, 68, 2; 86--92
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Removal Performance of Bio-Sorption on Sunflower Seed Husk for Copper and Lead Ions from Aqueous Solutions
Autorzy:
Abdulhusain, Noor Alaa
Mokif, Layla Abdulkareem
Powiązania:
https://bibliotekanauki.pl/articles/24201773.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
heavy metal
industrial wastewater
adsorption capacity
sunflower seed husk
Opis:
This study was concerned with the feasibility of using sunflower seed husk (waste material from the food industry) as a low-cost and available sorbent material to remove copper and lead ions. Sunflower seed husk was used for the biosorption of heavy metal ions (Pb(II) and Cu(II)) from aqueous solutions. The properties of natural adsorbent were characterized using Fourier transform infrared spectroscopy (FTIR). Pb(II) and Cu(II) adsorption were investigated in batch experiments through several influencing operating parameters, including contact time, sorbent dosage, initial pH, and initial concentration. The Pseudo-first-order and pseudo-second-order models were also applied to the experimental data to determine the adsorption kinetics. The results showed that adsorption of both ions fitted well by pseudo-Second-order, with determination coefficient R2 = 0.99, for both ions with SSE (1.628, 1.345) for Pb(II) and Cu(II), respectively.
Źródło:
Journal of Ecological Engineering; 2023, 24, 5; 110--117
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Proximate Analysis of Five Commercially Sold Maggi as Condiments in Gwagwalada, North Central, Nigeria
Autorzy:
Adeeko, E. L.
Shittu, G. A.
Adeeko, T. O.
Umar, M.
Powiązania:
https://bibliotekanauki.pl/articles/1075587.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
bioaccumulation
bouillon
condiments
heavy metal
mineral elements
proximate
Opis:
Determination of the proximate, nutritionally valuable mineral in five samples of food seasonings label as, A, B, C, D, & E food condiments readily consumed in Nigeria were obtained from Gwagwalada Central Market Abuja. Investigating the concentrations of some mineral elements such as, iron (Fe), zinc (Zn), and two heavy metals, cadmium (Cd) and lead (Pb) were carried out using AA320N Atomic Absorption Spectrophotometer (AAS) after acid digestion with 2:1 HNO3/HClO4. The result shows that all samples contained high levels of protein (13.63% ±0.53%) with mean value moisture, ash, fat, fiber, and carbohydrate for all samples levels being (3.94%±0.64%), (57.51% ±4.27%), (5.11% ±0.20%), (0.02% ±0.00%) and (18.41% ±0.41%) respectively. Sample D has high Fe concentration with (0.04 ±0.01 μg/g) and Sample B & C has low Fe concentration with (0.01 ±0.00 μg/g). Sample D & E has high Zn concentration with (0.03 ±0.01 μg/g) and sample A, B & C has low Zn concentration with (0.02 ±0.01 μg/g). In cadmium, sample A has the high concentration (0.03±0.01μg/g), sample B & D has the low Cd concentration (0.02 ±0.00 μg/g). Sample D had the high Pb concentration (0.05 ±0.00 μg/g), sample C had the low Pb concentration (0.02±0.01 μg/g). In conclusion, Fe, Zn, Cd and Pb were both present in low concentrations in all the samples analyzed. The presence of Cd and Pb in the food seasonings even at low concentration could prove fatal through bioaccumulation. The low level of the toxic metals, Pb and Cd indicates that these products meet the safe limits specified by most food standards.
Źródło:
World Scientific News; 2019, 122; 183-192
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Blood lead determinants and the prevalence of neuropsychiatric symptoms in firearm users in Mexico
Autorzy:
Aguilar Madrid, Guadalupe
Téllez-Cárdenas, Liliana
Juárez-Pérez, Cuauhtémoc A.
Haro-García, Luis C.
Mercado-García, Adriana
Gopar-Nieto, Rodrigo
Cabello-López, Alejandro
Powiązania:
https://bibliotekanauki.pl/articles/2177065.pdf
Data publikacji:
2015-11-12
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
neuropsychiatric symptoms
occupational exposure
lead exposure
blood lead
firearms
heavy metal toxicity
Opis:
Objectives To identify blood lead predictors and the prevalence of neuropsychiatric symptoms in firearm users of public security in Mexico. Material and Methods A cross-sectional study was performed on 65 males. We obtained socio-occupational data and determined venous blood lead (blood (B), lead (Pb) – BPb), as well as neuropsychiatric symptoms using the Q-16 questionnaire. A multiple linear regression model was constructed to assess determinants of BPb. Results The mean age in the study group was 34.8 years (standard deviation (SD) = 6.9, range: 21–60); the mean number of years spent in the company amounted to 14 years (SD = 8.5, range: 1–48). Twenty percent of the respondents (N = 13) used leaded glazed clay pottery (lead (Pb), glazed (G), and clay pottery (C) – PbGC) in the kitchen. During practice they fired a mean of 72 shots (SD = 60, range: 20–250), and during their whole duration of employment 5483 shots (SD = 8322.5, range: 200–50 000). The mean BPb was 7.6 μg/dl (SD = 6.8, range: 2.7–51.7). Two caretakers from the firing range had 29.6 μg/dl and 51.7 μg/dl BPb. The subjects who had shooting practice sessions ≥ 12 times a year reported a greater percentage of miscarriages in their partners (24% vs. 0%). Twelve percent of the respondents showed an increase in neuropsychiatric symptoms. The BPb multiple linear regression model explained R² = 44.15%, as follows: those who had ≥ 12 practice sessions per year – β = 0.5339 and those who used PbGC – β = 0.3651. Conclusions Using firearms and PbGC contributes to the increased BPb in the studied personnel. The determinants of BPb were: shooting practices >12 times a year and using PbGC. Blood lead concentrations reported in the study, despite being low, are a health risk, as evidenced by the prevalence of neuropsychiatric symptoms.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2016, 29, 2; 219-228
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Histological Damage at Gonad of Faunus ater (Gastropod Mollusk) Obtained from Heavy Metal Contaminated River
Autorzy:
Agustina, Rahmi
Sarong, M. Ali
Yulianda, Fredinan
Suhendrayatna, -
Dewi, Ervina
Powiązania:
https://bibliotekanauki.pl/articles/952451.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
Bale River
Reuleng River
heavy metal
Faunus ater
gonads
Opis:
The cause of the histological damage of Faunus ater (gastropod mollusk) gonad has been identified in the samples from two rivers, namely Bale River and Reuleng River which flow through residential, agricultural and industrial areas. The heavy metal concentration within the tissue of Faunus ater was analyzed with Atomic Absorption Spectrophotometer (Shimadzu AA 630). Meanwhile, the histological damage on gonads was observed microscopically. Afterwards, the damage levels obtained from the two respective rivers were compared and analyzed with t-test. The results confirm the histological damage that occurred in the gonads of Faunus ater collected from the two rivers. The gonadal damage of female Faunus ater from both rivers was found not to be significantly different, observed by the number of developed and damaged oocytes. It was also found that the gonads of male Faunus ater collected from Bale Riverl, have higher quantity of spermatogenic cells, in which they experience greater necrosis than the ones from Reuleng River.
Źródło:
Journal of Ecological Engineering; 2019, 20, 8; 114-119
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modification of industrial divinyl rubber by oxidative chlorophosphorylation and assess-ment of metal ion removal efficiency of obtained polymer sorbent
Autorzy:
Akhmedov, V. M.
Alfadul, S.
Maharramov, A. M.
Azizov, A. A.
Alosmanov, R. M.
Buniyad-Zadeh, I. A.
Powiązania:
https://bibliotekanauki.pl/articles/778480.pdf
Data publikacji:
2015
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Divinyl rubber
modification by chlorophosphorylation
nature and distribution of phosphoric functionalities in the polymer matrix
heavy metal ions
sorption
Opis:
The main goal of this study was the preparation of materials containing phosphoric functionalities on the base of industrial polymer - divinyl rubber and the assessment of their removal efficiency of heavy metals from aqueous solutions. The new method concerns the oxidative chlorophosphorylation of divinyl rubber by PCl3 with the following modification of obtained inter-mediates to create -PO(OH)2, -OPO(OH)2&enspgroups in the polymer chain. The obtained modified polymers get some new properties such as complex formation and capability for ion exchange. The nature and distribution of phosphoric functionalities in the polymer were studied by the methods of NMRand FTIR- spectroscopy, thermal analysis and scanning electron microscopy. The sorption properties of synthesized polymers towards some cations (Cu+2, Ni+2, Co+2 and Zn+2) from water solutions have been tested. It has been shown that the metal removal efficiency of prepared material depends on pH of medium, initial concentration and type of metal ions
Źródło:
Polish Journal of Chemical Technology; 2015, 17, 2; 112-118
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ecological risk assessment of heavy metals in soil developed on coastal marine sediment along coastal area in Anantigha, Calabar, Nigeria
Autorzy:
Aki, E. E.
Isong, I. A.
Powiązania:
https://bibliotekanauki.pl/articles/1076124.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
ecological risk factor
geo-accumulation Index
heavy metal
pollution load index marine sediment
Opis:
Coastal areas in Anantigha are utilized as dumpsite for industrial and domestic wastes including effluent from local industries and inhabitants of the area despite their usage for crop cultivation. Thus, the present study was designed to assess the concentration, pollution load and ecological risk of heavy metal in Anantigha coastal area. Standard pollution indices such as contamination factor (Cf), degree of contamination, pollution load index (PLI), enrichment factor (EF), geo-accumulation index (Igeo) and ecological risk index were deployed to assess the level of heavy metals contamination in the area. The results showed that the sediment was acidic under dried conditions and low in conductivity. The mean concentration levels of all the heavy metals were lower than their mean background values except for Al. The orders of dominance for concentration of heavy metals were: Al>Fe>Mn>Cu>Zn (Station 1) and Al>Fe>Mn>Zn>Cu (Stations 2, 3 and 4). Analyzed data showed that the sediments in the area are contaminated with Al with Igeo result showing station 2 and 4 been moderately to heavily contaminated with Al while station 4 was heavily contaminated with aluminium. Station 1 had low degree of contamination, whereas station 2 and 4 had moderate degree of contamination, and station 3 showed considerable degree of contamination. The PLI result indicates unpolluted condition and the area were not enriched by the studied heavy metals as shown by EF values. Hence, the sediment in Anantigha coastal marine area was classified as having low ecological risk factor. However, the levels of these metals are not static; there is tendency for increase as a result of increased human input and activities. Hence, there is a need for regular soil testing.
Źródło:
World Scientific News; 2019, 116; 1-24
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geochemical fractionation of heavy metals in sediments of the Red Sea, Saudi Arabia
Autorzy:
Al-Mur, B.A.
Powiązania:
https://bibliotekanauki.pl/articles/48293.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
geochemistry
heavy metal
surface sediment
speciation
bioavailability
sediment
Red Sea
Saudi Arabia
Źródło:
Oceanologia; 2020, 62, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial and temporal distribution of heavy metals in coastal core sediments from the Red Sea, Saudi Arabia
Autorzy:
Al-Mur, B.A.
Quicksall, A.N.
Al-Ansari, A.M.A.
Powiązania:
https://bibliotekanauki.pl/articles/48599.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Red Sea
Saudi Arabia
heavy metal
spatial distribution
temporal distribution
pollution
coastal sediment
sediment core
Opis:
Jeddah is the most industrialized city on the west coast of Saudi Arabia and is under increasing influence of human activities. Heavy metals data were obtained from four near-coast Red Sea sediment cores in close proximity to Jeddah. Chromium, manganese, iron, copper, zinc, and lead were analyzed from depth-resolved sections of each core via heavy acid digestion and inductively coupled plasma-mass spectrometry (ICP-MS). The average concentrations of all four sites were 245.96 mg kg1, 478.45 mg kg1, 8506.13 mg kg1, 251.82 mg kg1, 623.09 mg kg1, and 362.75 mg kg1, respectively. The depth-resolved results showed that highest concentrations of Mn, Cu, and Pb were found in the top 15 cm of the core profile distributions compared to other depth sub-samples. Heavy metal concentrations in core sediments are increased near central Jeddah and have become higher in recent years. The results of enrichment factor calculations indicate little anthropogenic supply of Mn and Cr while Pb, Zn, and Cu show strong anthropogenic input. The Pollution Load Index was higher in the two sites closer to central Jeddah where power and desalination plants and wastewater release are known. This indicates that the area has suffered from heavy metal pollution compared to other non-industrialized sites in the Red Sea. Heavy metal contaminations due to anthropogenic activity should be taken into account to protect the Red Sea during future growth. The results of this work should be considered as a baseline for heavy metals monitoring in the sediments of the Red Sea coast near Jeddah, Saudi Arabia.
Źródło:
Oceanologia; 2017, 59, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Health risk assessment of heavy metals in irrigation water, soil and vegetables from different farms in Riyadh district, Saudi Arabia
Autorzy:
Alturiqi, A.S.
Albedair, L.A.
Ali, M.H.H.
Powiązania:
https://bibliotekanauki.pl/articles/1192504.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
heavy metal
vegetables
dietary intake
health risk
HQ
THQ
ILCR
Opis:
The safety and security of different foodstuffs are considered important and have a high priority in global sustainable development. The contents of Fe, Mn, Cu, Zn, Ni, Pb and Cd were estimated in edible parts of 60 vegetable samples, irrigation water and agricultural soil collected from 5 farms in suburban areas around Riyadh district, Saudi Arabia. Also, soil pollution indices, pollution load index and contamination factor (PLI, CF), bioaccumulation factor (BAF), non-carcinogenic and carcinogenic risk indices (HQ, THQ, and ILCR) were estimated. The content of heavy metals in irrigation water and soil was within the recommended permissible levels, except for Cd in soil, which exceeds permissible levels. The trend of metal concentrations in both agricultural soil and vegetables was found in the order: Fe > Mn > Zn > Cu > Ni > Pb > Cd. Cluster analysis of the metal content in vegetables showed a tendency towards the accumulation of heavy metals in the order of leaves > roots > fruits > flowers > tuber. The BAFs values found were < 1.0, HQs values for Fe, Mn, Cu, Zn and Ni were found to be < 1, while the estimated HQs for Pb and Cd were > 1, posing greater risk to the health of adults and children. THQ values were higher for children compared to adults. ILCR values for Cd showed a serious issue, as it exceeds the threshold risk limit (>10−4) in all parts of the investigated vegetables in all sampling sites.
Źródło:
Journal of Elementology; 2020, 25, 4; 1269-1289
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ecological assessment of heavy metals in the grey mangrove (Avicennia marina) and associated sediments along the Red Sea coast of Saudi Arabia
Autorzy:
Alzahrani, D.A.
Selim, E.-M.M.
El-Sherbiny, M.M.
Powiązania:
https://bibliotekanauki.pl/articles/47854.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
mangrove
Avicennia marina
marine ecosystem
heavy metal
sediment
pollution index
principal component analysis
ecological assessment
Saudi Arabia
Red Sea
Źródło:
Oceanologia; 2018, 60, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Miasto w przestrzeni językowo-kulturowej polskiej muzyki metalowej z lat osiemdziesiątych XX wieku
The city in the linguistic-cultural area of Polish metal music from the 1980s
Autorzy:
Antas, Anna
Powiązania:
https://bibliotekanauki.pl/articles/445528.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
Tematy:
subculture
subculture of heavy metal listeners
city
conceptualization of the city
Opis:
The purpose of this article is to draw attention to the linguistic and cultural manner of conceptualizing the city in the lyrics of the Polish metal songs from the 1980s. After the analysis of the lyrics of nearly 300 songs, it could be argued that the city is evaluated mostly in a negative way, which is manifested by the linguistic means that are used to describe it. The gathered lyrics depict it as the “city of evil” and the “city of dread”. Inhabitants of the city are described by means of metonymy and personification hence cities “die” or “fall asleep”. There are also lots of expressionistic accounts that concern destruction of the city as the result of a nuclear disaster. The research material also contains citations that present the city as a loud, untidy and noisy place which overwhelms and besets the human.
Źródło:
Annales Universitatis Paedagogicae Cracoviensis. Studia Poetica; 2014, 2; 169-182
2353-4583
2449-7401
Pojawia się w:
Annales Universitatis Paedagogicae Cracoviensis. Studia Poetica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heavy metals in beach deposits, bottom sediments of a Baltic fishing port and surface water
Metale ciężkie w osadach plażowych, osadach dennych oraz w wodzie powierzchniowej bałtyckiego portu rybackiego
Autorzy:
Antonowicz, J.P.
Grobela, M.
Opalinska, M.
Motala, R.
Powiązania:
https://bibliotekanauki.pl/articles/85185.pdf
Data publikacji:
2017
Wydawca:
Akademia Pomorska w Słupsku
Tematy:
heavy metal
beach deposit
bottom sediment
Baltic Sea
fishing port
surface water
Opis:
Concentrations of metals, i.e. As, Cd, Cu, Mn, Ni, Pb, Zn were analysed in bottom deposits of a marine port in Ustka and within the adjacent beach sections. Metal concentrations within the port channel may be ordered in terms of increasing values as: Cd < As < Ni < Zn < Cu < Pb < Mn. Heavy metal concentrations detected in port sediments were much higher than those in beach deposits. Samples of surface waters were also collected from the port channel, harbour basins and nearby beaches and selected physico-chemical indexes were determined, including heavy metal concentrations.
Wykonano analizy stężenia metali As, Cd, Cu, Mn, Ni, Pb, Zn w osadach dennych portu morskiego w Ustce oraz w sąsiadujących odcinkach plaży. Stężenia metali w obszarze kanału portowego tworzyły stężeniowy szereg rosnący: Cd < As < Ni < Zn < Cu < Pb < Mn. Uzyskane stężenia metali ciężkich w osadach portowych były znacznie wyższe niż w osadach plażowych. Z kanału portowego, basenów portowych oraz w pobliżu plaż pobrano również próbki wody powierzchniowej, w których przeanalizowano stężenie wybranych parametrów fizykochemicznych, w tym metali ciężkich.
Źródło:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 2017, 21
1643-0115
Pojawia się w:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Treatment of Laboratory Wastewater by Using Fenton Reagent and Combination of Coagulation-Adsorption as Pretreatment
Autorzy:
Arita, Susila
Agustina, Tuty Emilia
Ilmi, Nurul
Pranajaya, Violanda Dwi Wulandari
Gayatri, Rianyza
Powiązania:
https://bibliotekanauki.pl/articles/2173343.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
laboratory wastewater
fenton reagent
coagulation
adsorption
heavy metal
Opis:
Laboratory wastewater contains organic and inorganic compounds that are harmful to the environment when disposed of without prior treatment. Besides the high COD and BOD values, the laboratory wastewater also contains metals such as iron (Fe), zinc (Zn), copper (Cu), chromium (Cr), and lead (Pb) which is categorized as dangerous waste material and can pollute the groundwater. Although the quantity of wastewater produced by the laboratory is relatively small, it has a real impact on the environment around the laboratory. However, the wastewater has to be treated properly before being discharged into the environment. The aim of the research was to study the laboratory wastewater treatment by using Fenton’s reagent with coagulation and adsorption pretreatment. In the pretreatment with coagulation, three types of coagulants are used, namely PAC (Poly Aluminum Chloride), ACH (Aluminum Chlorohydrate) and Aluminum Sulfate (AS) with their respective concentrations of 10–80 ppm. The highest percentage of average pollutant removal of 58.21% was found when 80 ppm of AS was applied. The pretreatment was continued by adsorption with activated carbon and zeolite adsorbents within 60–120 minutes of mixing time. It was detected that the most optimum adsorbent was activated carbon with average pollutant removal of 50.22% within 1 hour of mixing time. Processing was extended by utilized Fenton’s reagent using a variation of the molar ratio between 1:100 and 1:400. It was obtained that the best molar ratio to degrade the laboratory wastewater is 1:300 with an average removal of pollutant of 43.45%. As a result of laboratory wastewater treatment using combine Fenton’s reagent and coagulation-adsorption pretreatment, an average pollutant removal of 90.81% was obtained. The final content of COD, BOD, TSS, as well as Cu and Pb metal has met the environmental quality standard.
Źródło:
Journal of Ecological Engineering; 2022, 23, 8; 211--221
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heavy metals hazards from Nigerian spices
Autorzy:
Asomugha, R.N.
Udowelle, N.A.
Offor, S.J.
Njoku, C.J.
Ofoma, I.V.
Chukwuogor, C.C.
Orisakwe, O.E.
Powiązania:
https://bibliotekanauki.pl/articles/871490.pdf
Data publikacji:
2016
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
food product
food contamination
food contaminant
spice
heavy metal
hazard
risk assessment
public health
Nigeria
Opis:
Background. Natural spices are commonly used by the people in Nigeria. They may be easily contaminated with heavy metals when they are dried and then pose a health risk for the consumers. Objective. The aim of this study was to determine the levels of heavy metals in some commonly consumed natural spices namely Prosopis Africana, Xylopia aethiopica, Piper gineense, Monodora myristica, Monodora tenuifolia and Capsicum frutescens sold in the local markets of Awka, Anambra state, South East Nigeria to estimate the potential health risk. Results. The range of heavy metal concentration was in the order: Zn (14.09 – 161.04) > Fe (28.15 – 134.59) > Pb (2.61 – 8.97) > Cr (0.001 – 3.81) > Co (0.28 – 3.07) > Ni (0.34 – 2.89). Pb, Fe and Zn exceeded the maximum allowable concentrations for spices. The Target Hazard Quotient (THQ) of the spices varied from 0.06 – 0.5. Estimated daily intakes (EDI) were all below the tolerable daily intake (TDI). The lead levels in Prosopis africana, Xylopia aethiopica, Piper gineense, Monodora myristica and Capsicum frutescens which are 8-30 times higher than the WHO/FAO permissible limit of 0.3 mg/kg. Conclusions. Lead contamination of spices sold in Awka (south east Nigeria) may add to the body burden of lead. A good quality control for herbal food is important in order to protect consumers from contamination.
Źródło:
Roczniki Państwowego Zakładu Higieny; 2016, 67, 3
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 410

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies