用双硫腙法测定汞,主要的干扰元素是铜,消除汞测定中铜干扰的方法,已有很多报道,综合起来,可分为三类:一是汞被双硫腙萃取前将铜分离,如蒸馏法①、离子交换法②、充气法③等;二是在汞、铜都被双硫腙萃取后,反萃取将其分离,如用碘化物、溴化物或硫代硫酸盐的硫酸溶液进行反萃取④⑤;三是加入适当的掩蔽剂,如在PH3—5时加入 Determination of mercury by dithizone method, the main interference element is copper, to eliminate mercury in the determination of copper interference method has been reported in many ways, can be divided into three categories: First, the mercury was extracted before the separation of dithizone copper , Such as distillation ①, ion exchange ②, inflatable ③, etc .; the second is mercury, copper are extracted by dithizone, stripping their separation, such as with iodide, bromide or thiosulfate sulfuric acid The solution is back-extracted ④ ⑤; Third, add appropriate masking agent, such as added at PH3-5