tailieunhanh - A home – made purge and trap – thermos desorption - gas chromatograph coupled with atomic fluorescence detector for the determination of ultra – trace methylmercury

The trap was then heated to release volatile compounds including ethylmethylmercury into a GC-AFS for separation and detection. The instrumental detection limit was pg Hg/L. The method can therefore be applied for the determination of methylmercury in water samples at ultra – trace. | A home – made purge and trap – thermos desorption - gas chromatograph coupled with atomic fluorescence detector for the determination of ultra – trace methylmercury 94 SCIENCE AND TECHNOLOGY DEVELOPMENT JOURNAL: NATURAL SCIENCES, VOL 2, ISSUE 3, 2018 A home – made purge and trap – thermos desorption - gas chromatograph coupled with atomic fluorescence detector for the determination of ultra – trace methylmercury Le Thi Huynh Mai, Nguyen Cong Hau, Huynh Quan Thanh, Nguyen Van Dong* Abstract—A hyphenated system for terrestrial ecosystems through mining process, the methylmercury based on a gas chromatograph (GC) use of mercury in precious metal extraction, the coupled with an atomic fluorescence spectrometric burning of fossil fuels (., coal, oil, natural gas), (AFS) detector equipped with an online purge and and its use in products (., paint, electronic trap as a preconcentrator was made. Operating parameters for the whole system were optimized and devices) and by industrial activities (chlor-alkali analytical performances of the system are verified by plants, as a catalyst) [1]. In natural water, the main quality control chart for stability. Organomercurial Hg species are elemental (Hg0), inorganic (Hg2+) compounds in an aqueous sample were in-situ and alkylmercury compounds such as ethylated and purged to a trap in-line with a monomethylmercury [CH3Hg+], dimethylmercury separation device instead of conventional off-line [(CH3)2Hg], and aryl compounds [., solvent extraction. A 100 mL aqueous sample containing methylmercury in an impinger was phenylmercury]. Monomethylmercury is mixed with sodium tetraethylborate at pH . The commonly referred to as methylmercury (MeHg) forming volatile ethylmethylmercury was purged for [2]. Methylmercury is by far the most toxic and 30 minutes with the assistance of an Ar flow and most commonly occurring organic mercury trapped into a Tenax sorbent. The trap was then .