偶氮胂Ⅲ光度法同时测定硅钡合金中钡和钙

Simultaneous Determination of Barium and Calcium in Silicon Barium Alloy by Spectrophotometry with Arsenazo Ⅲ

用偶氮胂 为显色剂 ,在 p H7.0下 ,以 Ba- ASA - Zn- Phen多元配合物形式测定 Ba,并用 EGTA掩蔽 Ca,消除对 Ba的干扰 ;在 p H10时测定 Ca,并用硫酸铵消除 Ba对 Ca的干扰。此法经过简单分离后 ,可同时测定硅钡合金中 Ba和

Bi and Ca in silicon barium alloy were simultaneous determined by spectrophotometry with arsenazo Ⅲ.Ba was determined by Ba\|ASA Ⅲ\|Zn\|Phen at pH7.0 and Ca was determined by Ca\|ASA Ⅲ at pH10.The interference of Ba and Ca was studied,the effect of Ba on Ca can be eliminated by (NH 4 ) 2 SO 4 and that of Ca on Ba can be eliminated by EGTA.