锌试剂与微量汞反应的分光光度研究及环境学意义  

Spectrophometric Study of the Reaction of Zincon with Trace Mercury and Its Environmental Significance

作　　者：庄稼[1] 迟燕华[1] 张仰刚 董发勤[1] 

机构地区：[1]西南工学院材料科学与工程系,四川绵阳621002

出　　处：《岩石矿物学杂志》2000年第4期363-368,共6页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金项目!(批准编号 :495 0 2 0 2 5 )资助

摘　　要：本文研究了在 pH =6.70的缓冲溶液 (KH2 PO4 -NaOH)中锌试剂与汞生成的蓝色配合物。在最大吸收处吸光度与汞离子的含量成线性关系 ,配合物的吸收峰值为λmax=545nm ,比锌试剂本身吸收峰值 4 90nm位移 55nm ,配合物的表观摩尔吸光系数εε =2 .8× 10 5L·mol- 1·cm- 1。汞离子的标准工作曲线在 0 .1～ 2 5μg·mL- 1的范围内 ,符合朗伯 -比耳定律。最低检测浓度为 0 .0 1μg·mL- 1,同时 ,研究了测定该配合物的基本条件。实验表明 ,此反应灵敏度较高 ,稳定性和重现性好 ,操作方便 ,可用于环境中的生物体内微量汞的测定。Interaction between the zincon (zinc reagent) and trace mercury in pH 6.70 buffer solution (the system KH 2PO 4_NaOH) gives rise to a purplish red complex compound. There is a linear relation between the absorptivity and the Hg 2+ content at the maximum absorption. The peak of the absorption spectrum is λ max =545 nm, which has a bathochromic shift of about 55 nm relative to zincon (the peak of zincon is λ max =490 nm). The apparent molar absorptivity is 2.8×10 5 L·mol -1 ·cm -1 . The standard curve is in the range of 0.1～25 μg·mL -1 , obeying the Lamber_Beer law, and the detection limit is 0.01 μg·mL -1 for Hg 2+ at same conditions, basic conditions of determination were studied. The reaction is fast, senstive and easy to operate and shows a good reproducibility. It can be applied in the determination of trace mercury in industrial waster water, soil, minerals and organisms.

关 键 词：锌试剂 分光光度法 微量汞 环境学 共存离子 

分 类 号：X502[环境科学与工程—环境工程] O657.32[理学—分析化学]