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    Wyświetlanie 1-6 z 6
    Tytuł:
    Exposure to Methyl Methacrylate and Its Subjective Symptoms Among Dental Technicians, Tehran, Iran
    Autorzy:
    Golbabaei, F.
    Mamdouh, M.
    Jelyani, K. N.
    Shahtaheri, S. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/90960.pdf
    Data publikacji:
    2005
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    methyl methacrylate
    dental technicians
    dental laboratories
    health symptoms
    time-weighted average concentration
    peak concentration
    zagrożenia chemiczne
    służba zdrowia
    usługi stomatologiczne
    pyły
    narażenie zawodowe
    Opis:
    Exposure to methyl methacrylate (MMA), total dust and health symptoms were investigated in 20 dental laboratories located in Tehran, Iran. Time-weighted average (TWA) of MMA and peak concentrations were determined, using XAD-2 tubes followed by GC-ID analysis. Total dusts were evaluated gravimetrically. Health symptoms were asked using a questionnaire. TWA for technicians with direct and indirect exposure to MMA were 327.28 ± 79.42 and 282.9 ± 41.84 mg/m3, respectively. Peak concentration of MMA for those technicians were 337.0 ± 36.81 and 328.88 ± 45.40 mg/m3, respectively. There were no significant differences between TWA of MMA and peak concentration in different weekly workdays; however, within-day variations were observed (P < .05). TWA of MMA and peak concentration correlation with the laboratory volume were 0.61–0.65. Dust exposure of technicians was 2.35 ± 2.70 mg/m3. Cough and skin dryness were the common health symptoms. Smoking and asbestos exposure history were factors influencing cough prevalence (p < .05). It is concluded that the current Short-Term Exposure Limit (STEL) is not low enough to protect technicians against the adverse effects caused by MMA.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2005, 11, 3; 283-289
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sample Preparation Followed by High Performance Liquid Chromatographic (HPLC) Analysis for Monitoring Muconic Acid as a Biomarker of Occupational Exposure to Benzene
    Autorzy:
    Shahtaheri, S. J.
    Ghamari, F.
    Golbabaei, F.
    Rahimi-Froushani, A.
    Abdollahi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/91059.pdf
    Data publikacji:
    2005
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    benzene
    muconic acid
    sample preparation
    solid-phase extraction
    biological monitoring
    chromatography
    Opis:
    Factors affecting solid phase extraction (SPE) of trans,trans-muconic acid (ttMA), as a benzene biomarker, including sample pH, sample concentration, sample volume, sample flow rate, washing solvent, elution solvent, and type of sorbent were evaluated. Extracted samples were determined by HPLC-UV (high performance liquid chromatography-ultraviolet). The analytical column was C18, UV wave length was 259 nm, and the mobile phase was H2O/methanol/acetic acid run at flow rate of 1 ml/min. A strong anion exchange silica cartridge was found successful in simplifying SPE. There was a significant difference between recoveries of ttMA when different factors were used (p < .001). An optimum recovery was obtained when sample pH was adjusted at 7. There was no significant difference when different sample concentrations were used (p > .05). The optimized method was then validated with 3 different pools of samples showing good reproducibility over 6 consecutive days and 6 within-day experiments.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2005, 11, 4; 377-388
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solid Phase Extraction for Evaluation of Occupational Exposure to Pb (II) Using XAD-4 Sorbent Prior to Atomic Absorption Spectroscopy
    Autorzy:
    Shahtaheri, S. J.
    Khadem, M.
    Golbabaei, F.
    Rahimi-Froushan, A.
    Ganjali, M. R.
    Norouzi, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/90822.pdf
    Data publikacji:
    2007
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    lead
    sample preparation
    atomic absorption spectroscopy
    Opis:
    Lead is an important constituent widely used in different industrial processes. For evaluation of workers’ exposure to trace toxic metal of Pb (II), solid-phase extraction (SPE) was optimized. SPE using mini columns filled with XAD-4 resin was developed with regard to sample pH, ligand concentration, loading flow rate, elution solvent, sample volume, elution volume, the amount of resins, and sample matrix interferences. Lead ions were retained on a solid sorbent and then eluted, followed by a simple determination of analytes with flame atomic absorption spectrometery. The obtained recoveries of metal ions were greater than 92%. This method was validated with 3 different pools of spiked urine samples; it showed a good reproducibility over 6 consecutive days as well as 6 within-day experiments. This optimized method can be considered successful in simplifying sample preparation for a trace residue analysis of lead in different matrices when evaluating occupational and environmental exposures is required.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2007, 13, 2; 137-145
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of Headspace Solid Phase Microextraction Procedure for Trace Analysis of Toluene
    Autorzy:
    Heidari, H. R.
    Shahtaheri, S. J.
    Golbabaei, F.
    Alimohammadi, M.
    Rahimi-Froushani, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/90998.pdf
    Data publikacji:
    2008
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    headspace
    solid phase microextraction
    gas chromatography
    toluene
    Opis:
    This study describes optimization of headspace solid phase microextraction followed by gas chromatography equipped with a flame ionization detector for toluene at trace level in spiked urine. The parameters affecting the extraction and gas chromatographic determination of analytes were studied: extraction time and temperature; desorption time and temperature; addition of NaCl; and pH, volume and agitation of the sample. Optimized headspace extraction was carried out at 30 °C for 6 min in the presence of 0.2 g⋅m–1of NaCl in the sample solution. Also, sample volume and sample pH were optimized at 5 ml and 7 (neutral pH), respectively. Desorption of the analytes was carried out at 250 °C for 60 s. The optimized procedure was validated with 3 different pools of spiked urine; it showed good reproducibility over 6 consecutive days and 6 within-day experiments. The study also determined the accuracy, linearity and detection limits of this method.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2008, 14, 4; 395-405
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pulmonary Functions of Welders in Gas Transmission Pipelines in Iran
    Autorzy:
    Golbabaei, F.
    Khadem, M.
    Ghahri, A.
    Babai, M.
    Hosseini, M.
    SeyedSomea, M.
    Dinari, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/90327.pdf
    Data publikacji:
    2013
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    fume
    pulmonary functions
    pulmonary symptoms
    welding
    spirometric test
    funkcje płuc
    spawanie
    badanie spirometryczne
    Opis:
    This study evaluated the influence of welding on pulmonary functions in welders. Spirometry tests were performed before and after work shift in 91 welders and 25 clerks (control group). We examined forced vital capacity (FVC), forced expiratory volume in 1 s (FEV1), FEV1/FVC ratio and forced expiratory flow 25%–75%(FEF 25–75). Significant differences were found for FVC and FEV1/FVC between welders and the control group in pre- and post-shift measurements (p < .001). In welders, smoking and nonsmoking habit had no significant effects on any pulmonary indices before or after shift. Work experience and fume concentrations also had no significant effects on the majority of spirometric indices (p > .05). Most welders had at least 1 of the respiratory symptoms. Significant differences were found between pre- and post-shift indices (as percentage of predicted values calculated with spirometer) and between the welders engaged in some welding tasks and the control group before work shift. This study documented work-related changes in pulmonary functions in the welders and marked drops in these functions without symptoms in some welders.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2013, 19, 4; 647-655
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluating Workers’ Exposure to Metalworking Fluids and Effective Factors in Their Dispersion in a Car Manufacturing Factory
    Autorzy:
    Andani, A. M.
    Golbabaei, F.
    Shahtaheri, S. J.
    Foroushani, A. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/90086.pdf
    Data publikacji:
    2014
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    metalworking fluid
    occupational exposure
    temperature
    air velocity
    total mist
    thoracic mist
    obróbka metali
    ryzyko zawodowe
    narażenie zawodowe
    temperatura
    Opis:
    Introduction. Metalworking fluids (MWFs), which are widely used in metalworking operations, can cause different adverse effects, e.g., dermal and respiratory disorders, and cancer. Evaluating workers’ exposure to MWF mists and the effective factors in their dispersion were the purpose of this study. Materials and Method. Seventy-five out of 300 workers working in metalworking workshops were randomly selected. MWF concentrations were measured with the National Institute for Occupational Safety and Health (NIOSH) 5524 method. Air temperature and velocity were also determined as the predicted effective parameters on the level of exposure. Results. The results indicated that exposure to MWF mists in one workshop was higher than in the other ones (p < .05). The findings also showed that temperature was an effective factor in the dispersion of MWF mists (p < .05). Discussion. The exposure of almost all workers was under the threshold limit value of 5 mg/m 3, but it was over the value recommended by NIOSH of 0.5 mg/m 3. Air temperature was an effective factor in workers’ exposure (r = .576).
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2014, 20, 2; 273-280
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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