催化过氧化氢氧化镍-铬蓝黑R络合物光度法测定水体中痕量汞  

Spectrophotometric determination of trace mercury in water based on hydrogen peroxide catalyzing the oxidation reaction of nickel-palatine chrome black complex

作　　者：滑照军[1] 湛敏[1,2] 

机构地区：[1]重庆大学化学化工学院,重庆400044 [2]重庆大学三峡库区生态环境教育部重点试验室,重庆400045

出　　处：《分析试验室》2009年第12期22-25,共4页Chinese Journal of Analysis Laboratory

基　　金：国家自然科学基金(20877105)项目资助

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2.00 mL4 g/L聚乙烯醇(PVA)作表面活性剂,5.00 mL H2O2(1+9)溶液可氧化1.00 mL0.001 mol/L Ni2+溶液与1.00 mL0.400 g/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571 nm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。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.

关 键 词：分光光度法 汞 铬蓝黑R 镍 H2O2 

分 类 号：O657.3[理学—分析化学]