4-硝基-4'-磺酰胺基苯基重氮氨基偶氮苯的合成及其与汞(Ⅱ)显色反应的研究

Synthesis of a new chromogenic reagent 4-nitryl-4′-sulphonamidobenzenediazoaminoazobenzene and study on its color reaction with mercury(Ⅱ)

合成了新显色剂4-硝基-4'-磺酰胺基苯基重氮氨基偶氮苯(NSADAA),并研究了其在Triton X-100存在下与Hg(Ⅱ)的显色反应。在pH9.0～11.0缓冲范围内,NSADAA与Hg(Ⅱ)形成摩尔比2∶1的红色配合物,其最大吸收波长为518nm,表观摩尔吸光系数ε=1.50×105L·mol-1·cm-1,Hg(Ⅱ)的质量浓度在0～0.8μg/mL范围内遵守比耳定律。方法可用于测定废水中微量Hg(Ⅱ)。

The synthesis of a new chromogenic reagent 4-nitryl-4＇-sulphonamidobenzenediazoa-minoazobenzene （NSADAA） and its color reaction with mercury （ Ⅱ） in the presence of triton X-100 was stuidied. The reagent can react with mercury （ Ⅱ） to form a red complex with a molar ratio of 2 ： 1 in a medium of pH 9.0 - 11.0. Its apparent molar absorptivity is 1.50 × 10^5L·mol^-1·cm^-1 at the maximum absorption of 518 nm. Beer＇s law is obeyed in the concentration range of 0 - 0.8 μg/mL for Hg（ Ⅱ ）. The method has been applied to the determination of trace mercury in waste water with satisfactory results.