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研究了Ｋ＿４〔Ｆｅ（ＣＮ）＿６〕－硫脲－Ｈ＿２ＳＯ＿４测定痕量汞的催化显色新体系。Ｈｇ（Ⅱ）的浓度在０～１．０２μｇ／２５ｍＬ范围内遵守Ｂｅｅｒ定律，间接摩尔吸光系数ε′＿（６１５）＝６．６×１０￣５Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１）．回收率９０．２％～１０２．０％，变异系数２．０８％。该法用于饮料等食品中痕量汞的测定获得令人满意的结果。
A new catalytic chromogenic system for the determination of trace mercury with K_4 [Fe (CN) _6] -thiourea-H_2SO_4 was studied. Beer’s law was obeyed for the concentration of Hg (Ⅱ) in the range of 0 ~ 1.02μg / 25mL. The indirect molar absorptivity ε ’_ (615) = 6.6 × 10 ~ 5L · mol ~ (-1) · cm ~ 1). The recoveries ranged from 90.2% to 102.0% with a coefficient of variation of 2.08%. The method for the determination of trace mercury in beverages and other foods obtained satisfactory results.