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Resolution of matrix effects on analysis of total and methyl mercury in aqueous samples from the Florida Everglades

Fresenius' Journal of Analytical Chemistry

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, , , ,

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Abstract

Aqueous samples from the Florida Everglades present several problems for the analysis of total mercury (HgT) and methyl mercury (MeHg). Constituents such as dissolved organic carbon (DOC) and sulfide at selected sites present particular challenges due to interferences with standard analytical techniques. This is manifested by 1) the inability to discern when bromine monochloride (BrCl) addition is sufficient for sample oxidation for HgT analysis; and 2) incomplete spike recoveries using the distillation/ethylation technique for MeHg analysis. Here, we suggest ultra-violet (UV) oxidation prior to addition of BrCl to ensure total oxidation of DOC prior to HgT analysis and copper sulfate (CuSO4) addition to aid in distillation in the presence of sulfide for MeHg analysis. Despite high chloride (Cl-) levels, we observed no effects on MeHg distillation/ethylation analyses. ?? Springer-Verlag 1997.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Resolution of matrix effects on analysis of total and methyl mercury in aqueous samples from the Florida Everglades
Series title:
Fresenius' Journal of Analytical Chemistry
Volume
358
Issue:
3
Year Published:
1997
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Fresenius' Journal of Analytical Chemistry
First page:
392
Last page:
396
Number of Pages:
5