کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10528954 | 960763 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Development and complete validation of a method for the determination of dimethyl mercury in air and other media
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
The rigorous validation of a previously developed research method for the determination of dimethyl mercury ((CH3)2Hg) in environmental samples is presented. During atmospheric analysis, (CH3)2Hg was trapped on Carbotrap⢠and analyzed by thermal desorption, isothermal GC separation, and cold vapor atomic fluorescence spectrometry (CVAFS). Water samples were analyzed after direct purging of 100 mL aliquots onto Carbotrapâ¢, while sediment and tissue samples were digested with 10 mL of 25% KOH in methanol at 60 °C and diluted to 40 mL with methanol. An ambient air-spiking manifold, which allowed simultaneous replicate sampling, was constructed in a room controlled for temperature and humidity. (CH3)2Hg was introduced into the feed airflow (0.4 m3 minâ1) from a well-calibrated diffusion cell, to obtain a concentration of approximately 5.5 ng mâ3 as Hg. Samples were collected onto Carbotrap⢠columns, and the total volumes quantified by integrating mass flow meters. Trapping efficiency was investigated over a range of sampler flow rates (0.05-0.25 L minâ1), volumes (2-200 L), collection temperatures (15-42 °C) and relative humidity levels (10-70%). Method detection limits (MDLs), analytical precision and accuracy were quantified for all media. Carbotrap⢠was found to be the best choice as a sampling media, whereas Tenax⢠was found to be inadequate due to high breakthrough (>70%). This study verified that the method is sufficiently precise, accurate and robust for field sampling at mercury contaminated sites. No interferences were observed from elevated levels of potential co-contaminants, Hg0 (125 ng mâ3) and H2S (1.27 ppmv).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 546, Issue 1, 1 August 2005, Pages 92-101
Journal: Analytica Chimica Acta - Volume 546, Issue 1, 1 August 2005, Pages 92-101
نویسندگان
Nicolas S. Bloom, Angela K. Grout, Eric M. Prestbo,