中文摘要：

采用催化过氧化氢氧化Ni（Ⅱ）-铬蓝黑R络合物光度法测定汞，通过优化对比实验，确定最佳反应条件为在pH4．12的HAc-NaAc缓冲溶液中，以2．00mL4g／L聚乙烯醇（PVA）作表面活性剂，5．00mLH2O2（1＋9）溶液可氧化1．00mL0．00lmol／LNi^2＋溶液与1．00mL0．400g/L铬蓝黑R溶液反应生成的Ni（II）-铬蓝黑R络合物，75℃水浴加热，汞对该反应具有明显催化作用。在波长571nm处催化体系和非催化体系的吸光度差值最大。Hg（Ⅱ）在0．1～2．0μg/L范围内符合朗格-比尔定律，检出限为3．2×10^-9g／L。经实际水体样本论证，本法可用于自然水体中痕量汞的直接测定。

英文摘要：

A new catalytic kinetic spectrophotometric determination of trace mercury（ 11 ） based on its catalytic oxidizing discoloration reaction of nickel（ II ）-palatine chrome black complex by 5.00 mL of 3.0% hydrogen peroxide with 2.00 mL of 0.4% pelyvinyl alcohol （PVA） as an activating agent in the presence of acetic acid-sodium acetate buffer solution of pH 4.12. The maximum absorbance difference of catalytic system and non-catalytic system appears at 571 um. The beer＇s law is well obeyed in the range of 0.1 - 2 μg/L for mercury, and the detection limit is 3.2 × 10^-9 g/L. The method is free from interference of common ions after extraction separation, and it has been applied to the determination of trace amounts of mercury in water.