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Wyszukujesz frazę "elemental compositions" wg kryterium: Wszystkie pola


Wyświetlanie 1-2 z 2
Tytuł:
Geographical variations in elemental compositions of two pesticidal plants from three agro-ecosystems in Nigeria and their wood protection potentiality
Autorzy:
Eguakun, Funmilayo Sarah
Adedeji, Gabriel Adetoye
Elufioye, Taiwo Olayemi
Egubogo, Azuka Chinedum
Powiązania:
https://bibliotekanauki.pl/articles/962663.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Opis:
Lawsonia inermis and Lagenaria breviflora are important tropical pesticidal plants with some potential for industrial wood protection uses. However, little is known about their elemental composition of wood protection importance. In this study, three agro-ecosystems: Guinea savannah (A), Dry rainforest (B), and Fresh water swamp forest (C) were selected and from each zone Lawsonia inermis leaves and Lagenaria breviflora fruits were collected and extracted. Six most important elements: arsenic (As), boron (B), chromium (Cr), copper (Cu), lead (Pb) and zinc (Zn) used to formulate outlawed standard wood preservatives, were quantitatively analysed by the spectrophotometric method. Data were analysed using analysis of variance (ANOVA) and t-test at α 0.05. All the elements were present in both plants, with chromium being most copious. Arsenic concentrations were in the range of 1.05±0.04 to 1.19±0.02 mg kg-1 for L. inermis and 1.16±0.05 to 1.34±0.10 mg kg-1 for L. breviflora. Boron ranged from 1.59±0.09 to 1.75±0.06 mg kg-1 for L. inermis and 2.15±0.24 to 3.00±0.14 mg kg-1 for L. breviflora. Chromium ranged from 28.94±0.21 to 44.15±0.13 mg kg-1 for L. inermis and 0.63±0.05 to 21.55±0.47 mg kg- 1 for L. breviflora. Copper ranged from 2.55±0.17 to 11.35±0.17 mg kg-1 for L. inermis and 9.94±0.21 to 15.83±0.17 mg kg-1 for L. breviflora. Lead ranged from 21.36±0.44 to 22.86±0.11 mg kg-1 for L. inermis and 19.41±0.33 to 32.50±0.47 mg kg-1 for L. breviflora. Zinc ranged from 2.35±0.19 to 21.85±0.19 mg kg-1 for L. inermis and 6.18±0.10 to 7.10±0.14 mg kg-1 for L. breviflora. Lawsonia inermis and Lagenaria breviflora from Dry rainforest had significantly high pesticidally relevant elements, producing extracts that could be best explored as bio-preservatives for wood protection. Further research covering all the agro-ecosystems with individual and extract synergising tests against wood degrading agents are suggested.
Źródło:
Journal of Elementology; 2017, 22, 4
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elemental composition and rough source apportionment of fine particulate matter in air in Cracow, Poland
Autorzy:
Samek, L.
Gdowik, A.
Ogarek, J.
Furman, L.
Powiązania:
https://bibliotekanauki.pl/articles/208112.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
elemental compositions
X-ray fluorescence method
source apportionment
source contributions
Cracow
metoda fluorescencji rentgenowskiej
Kraków
koncentracja pyłów zawieszonych
źródła emisji zanieczyszczeń
Opis:
Samples of PM2.5 fraction (particles with aerodynamic diameter ≤2.5 mu m) of air particulates were collected in winter 2011 and summer 2012 in Cracow, Poland. The concentrations of PM2.5 were 50 ±23 mu g/m3 (wintertime) and 16 ± 6 mu g/mV (summertime). The energy dispersive X-Ray fluorescence method was used for the determination of the concentrations of PM2.5-related elements. Principal component analysis and multilinear regression analysis were used to determine source contributions to ambient concentrations of PM2.5. In wintertime, the sources of air pollution were identified as municipal emission, steel and ferrous industry (49.2%), traffic (37.8%) and other, not identified sources (13%), whereas during summer, they were traffic (53%), steel and ferrous industry (18%), and not identified sources (29%).
Źródło:
Environment Protection Engineering; 2016, 42, 1; 71-83
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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