硫氰酸盐光度法测定高温合金钢中钼、钨  

Determination of Molybdsnum and Tungsten in High - Temperature Alloy Steel by Thiocyanate Salt SPectrophotometry

作　　者：陈万明[1] 伍盈盈[1] 

机构地区：[1]贵州工业职业技术学院化学与材料工程学院,贵州贵阳550008

出　　处：《贵州工业职业技术学院学报》2012年第4期35-38,共4页GUIZHOU SCIENCE AND TECHNOLOGY PROFESSIONAL COLLEGE

摘　　要：硫氰酸盐光度法是测定钼、钨的经典方法。试样经溶解后，用氯化亚锡作还原剂，在硫酸介质中，Mo（VI）被还原为Mo（V），然后与SCN-形成显桔红色配合物，而钨不被还原，用强还原剂（如三氯化钛）钼可被还原到更低价，而不与SCN-显色：而钨被还原为五价与SCN-显色；因此在同一溶液中测定钨、钼。本文就该法的测定做进一步的阐述。Thiocyanate salt photometric method was the classical method to determine molybdsnum and tungsten. After dissolving the gample, stannous chloride is used as a reduetant, in sulfuric acid medium, Mo（ VI ）was reduced to Mo（ V）, then forms an orange -red complexeswith SCN, W would not be restored; Mo can be lower reduction by strong reducing agent （such as three chlorinated titanium）, but showed no color with SCN- ： and W was reduced to five price with the SCN- showed color. So in the same solution,W and Mo can be determined. The further explanation of determination was presented in the paper.

关 键 词：高温合金钢硫氰酸盐光度法 钼 钨 

分 类 号：O657.31[理学—分析化学]