Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7674344 | Spectrochimica Acta Part B: Atomic Spectroscopy | 2015 | 6 Pages |
Abstract
Ultra-traces of methylmercury at the sub-ppt level can be magnified in the foodweb and is of concern. In environmental monitoring a routine robust analytical method is needed to determine methylmercury in water. The development of an analytical method for ultra-trace speciation analysis of methylmercury (MeHg) in water samples is described. The approach is based on HPLC-CV-AFS with on-line preconcentration of water samples up to 200Â mL, resulting in a detection limit of 40Â pg/L (ppq) for MeHg, expressed as Hg. The unit consists of an optimized preconcentration column filled with a sulfur-based sorption material, on which mercury species are preconcentrated and subsequently eluted, separated and detected via HPLC-CV-AFS (high performance liquid chromatography-cold vapor atomic fluorescence spectrometry). During the method development a type of adsorbate material, the pH dependence, the sample load rate and the carry-over were investigated using breakthrough experiments. The method shows broad pH stability in the range of pHÂ 0 to 7, without the need for buffer addition and shows limited matrix effects so that MeHg is quantitatively recovered from sewage, river and seawater directly in the acidified samples without sample preparation.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Christoph-Cornelius Brombach, Bin Chen, Warren T. Corns, Jörg Feldmann, Eva M. Krupp,