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汞的水相光度测定虽然已有报导,但并不多。文献首次合成2—(5—Br—2—吡啶偶氮)—5—二氨基苯酚(简称5—Br—PADAP)以来,很多分析工作者应用该试剂对近20种金属离子进行了光度测定,摩尔吸光系数多数在10~5数量级。本文探讨了该试剂用于光度法测定汞的可能性。实验证明,在非离子表面活性剂TrironX—100(简称TX—100)存在下,汞与5—Br—PADAP反应生成了可溶于水的桔红色络合物。
Although the aqueous mercury photometry has been reported, but not much. In the literature for the first time since the synthesis of 2- (5-Br-2-pyridylazo) -5-diaminophenol (referred to as 5-Br- PADAP), many analysts use this reagent to photometric determination of nearly 20 kinds of metal ions, Most of the molar extinction coefficient in the order of 10 to 5. This article explores the possibility of using this reagent for the spectrophotometric determination of mercury. Experiments show that in the presence of non-ionic surfactant TrironX-100 (TX-100), mercury reacts with 5-Br-PADAP to form a water-soluble orange complex.