钼制品中低含量钨测定方法的改进  

Improvement on Method for Determination of Low Content Tungsten in Molybdenum Product

作　　者：王长基[1] 

机构地区：[1]赣州华兴钨制品有限公司,江西赣州341000

出　　处：《江西冶金》2007年第5期38-39,43,共3页Jiangxi Metallurgy

摘　　要：方法基于在pH8—9的溶液中，使钨和Fe（OH）3共沉淀与钼分离，然后以盐酸溶解沉淀，再以NaOH沉淀Fe（OH）3，此时钨留在溶液中与Fe^3＋分离，最后以三氯化钛为还原剂，在盐酸介质中，钨与硫氰酸盐生成黄绿色络合物，于波长430nm处比色测定。该方法准确度和精密度都较好，结果令人满意。In the solution of pH value 8 -9 ,tungsten and Fe^3＋ are coprecipitated,and separated from molybdenum ion,then deposition is dissolved by hydrochloric acid, subsequently iron hydroxide deposited after adding sodium hydroxide solution ,hence tungsten iron is remained in the solution separated from Fe^3＋. Ultimately,using titanium trichloride as reducing agent ,tungsten and isothiocyanate are formed green yellow chelate at the presence of hydrochloric acid, which is detected with colorimetry at the wave length of 430 nm. The method has behave well with high accuracy and precision.

关 键 词：共沉淀 三氯化钛 二氯化锡 显色时间 

分 类 号：O657.3[理学—分析化学]