Journal of the Brazilian Chemical Society | |
Methodology optimization and application for measurement of gaseous elemental mercury in the amazon atmosphere | |
Marins, Rozane V.1  Lacerda, Luiz D.1  Universidade Federal do Ceará, Fortaleza, Brazil1  Almeida, Marcelo D.1  Universidade Federal Fluminense, Niterói, Brazil1  Paraquetti, Heloisa H. M.1  | |
关键词: gaseous elemental mercury (GEM); atmospheric mercury; Amazon atmosphere; methodology optimization; | |
DOI : 10.1590/S0103-50532008000700010 | |
学科分类:化学(综合) | |
来源: SciELO | |
【 摘 要 】
The aim of this study was to optimize a semi-automatic methodology using commercial pure gold cartridges (Tekran Inc.) to quantify gaseous elemental mercury (GEM) in the Amazon atmosphere. The detection limit was 0.020 ± 0.006 ng Hg. This corresponds to detection limits varying from 0.2 to 0.4 ng Hg m-3, for field sample volumes ranging between 0.1 and 0.05 m3. The similarity between the 9 tested cartridges was evaluated. Under sampling flow rates varying between 0.4 and 2.0 L min-1 no difference among cartridges was observed. The maximum retention capacity of the cartridge (breakthrough) was not reached in experiments with flow rates of 1 or 2 L min-1, and with Hg concentration of 25 ng m-3 and maximum air volume of 150 L. Water condensation on the gold surface showed to be a problem, but that was solved by heating the sample cartridge at 60 ºC during sampling.
【 授权许可】
Unknown
【 预 览 】
Files | Size | Format | View |
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RO201912050580499ZK.pdf | 383KB | download |