Dithizone derivatives as sensitive wtr soluble chromogenic reagents for the ion chromatographic determination of inorganic and organo-mercury in aqueous matrices

摘要

Water-soluble sulfonate an th novel carboxylate analogues of dithizone,combined with ion interaction chroma-tography on a Dionex Acclaim 120 C_18 silica column(250X4.6 mm id) with an eluent consisting of 10 mM tetrabutylammonium bromide and 60:40 methanol:water,have been developed as highly sensitive chromogenic ligands for the quantitative isocratic determination of inorganic and organo-mercury compouds in aqueous matrices in under 12 min.Using an optimised post column reagent system containing 0.65 mM dye,0.5% Triton x-100 and 50mM sodium hydroxide,good linearity (0-7.5 mg L~-1 R~2>0.999),reproducibility using peak area measurements (RSD 0.69-1.38%,n=8),and limits of detection (4-12mug L~-1) were achieved for methyl mercury,inorganic mercury and phenyl mercury.