Methyl mercury dithizonate

Blood, urine, hair, fish (total, methyl Hg) Total digestion of sample with nitric, perchloric, and sulfuric acids Methyl mercury in hair digestion with HCI and extraction into benzene. Methyl mercury in blood, fish, and urine digestion with KOH and extraction into dithizone solution, cleaned up via extractions. Total CVAAS, methyl mercury GC/ECD 0.5 ng No data Akagi et al. 1995... 

Diethyldithiocarbamate, pyrrolidin-1 -yldithioformate, and diphenylthiocarbazone (dithizone), as three mercury chelate forming reagents, were used for the preconcentration of ultratrace amounts of inorganic mercury and methyl mercury in silica Cig minicolumn as the solid sorbent. Sample FI online sorbent extraction was coupled with continuous cold vapor atomic absorption spectrometry (CVAAS) for detection. The results showed the superiority of the carbamate type reagents over the dithizone for the online formation and preconcentration of the corresponding mercury chelate. The detection limit was found to be 16 ng/L of mercury. The structures of these organic chelate modifiers are shown in Scheme 17. 

Transformation of methylmercury chloride to methyImercury dithizonate. Concentrate 10ml of a benzene solution of methyl-mercury chloride to 0,1ml by evaporation of part of the solvent under reduced pressure. There is an obvious loss of the mercury compound by this concentration. Add a 0,4% dithizone solution in benzene until a green coloration is obtained. 

The crystal structures of methyl- and phenyl-mercury(II) dithizonates have been determined as part of a study on the photochroism of such compounds.149 In both structures the chelate is planar, with an irregular three-coordination at the metal including N and S of the ligand. The article provides a short structural review of dithizone complexes. 

Organomercury(ll) ions (e.g., methyl-, ethyl-, and phenylmercury) also react with dithizone and have been determined by this method [26,27]. Mercury(II) can be determined in the presence of organomercury(II) compounds [28]. Organomercury(II) compounds, isolated with dithizone, can be separated by liquid-phase chromatography [29]. 

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