巯基棉吸附分离－DBC偶氮胂光度法测定钢铁中痕量铋

Spectrophotometric Determination of TRace Bismuth in lron and Steel with DBC－Arseazo by Sulfhydryl Cotton Separation

本文提出了在０．１５ｍｏ１／ＬＣ１介质中用巯基锦吸附分离钢铁中痕量铋，用３。０ｍｏｌ／３。０ｍｏ１／ＬＨＣ１洗脱，在０．６ｍｏ１／ＬＨＣ１Ｏ４介质中Ｂｉ（Ⅲ）与ＤＢＣ－偶氮胂形成蓝色络合物，络合比为１：２，Ｂｉ量在０～２０μ／２５ｍ１比尔定律，表观摩尔吸光系数为７．８４×１０￣４。方法适用于不含高钨、高铌的各类钢中痕量铋的测定，检测限可以达到０．００００％。

In 0．15mol／L HClO_4 medium DBC－arsenazo reagent reacts with of trace amounts bismuth in iron and steed is re-ported in this paper .In 0．6mol／L HClO_4 medium DBC -arsenazo reagent reagent reacts with Bi （Ⅲ）to form a blue complex .The molar ratio of Bi（Ⅲ）to DBC－arsenazo is found to be 1:2 .The absorption peak of the complex is at 630nm .The molarabsorptivity is 784 ×10~4．Beer’s law is obeyed for 0－20 μg／25ml of bismuth This method is applied to determination of trace bismuth in steel and superalloy .