摘要
合成了新试剂三氮烯NPCPDT,即1-（4-硝基苯基）-3-（5-氯吡啶）.研究了NPCPDT与汞（Ⅱ）的显色反应.结果表明,在pH为1.5的Na2B4O7-NaOH介质中,在TX-100存在下,Hg（Ⅱ）与NPCPDT形成稳定的1：2型配合物,在440nm处有一最大正吸收,在530nm处有一最大负吸收,表观摩尔吸光系数为2.45×10^5L/mol·cm,Hg（Ⅱ）的量在0～12μg/25ml内符合比尔定律.本法灵敏度高,选择性好,用于测定废水和环境水样中的微量汞,获得了满意结果.
A new chromogenic reagent NPCPDT, 1-（4-nitrophenyl）-3-（5-chloropyridy） was synthesized in this paper. A color reaction of mercury （ Ⅱ ） with NPCPDT was studied. The experimental results showed that, in the Na2BaOT-NaOH medium at pH 11.5, in the presence of TX-100, mercury （ Ⅱ ） reacts with NPCPDT to form a stable complex which has maximum absorption at 530nm. The molar ration of Hg to NPCPDT is 1：2, The molar absorptivity is 2.45 × 10^5L/mol· cm by dual-wavelengh of 440nm and determination wavelengh of 530nm, Beer＇s law was obeyed in the range of 0 - 12μg Hg（ Ⅱ ） in 25ml solution. This method which shows high sensitivity and good selectivity was applied to the determination of trace mercury in waste water and environmental water sample with satisfactory results.
出处
《中国环境监测》
CAS
CSCD
北大核心
2006年第2期24-26,共3页
Environmental Monitoring in China
