摘要
试样以盐酸硝酸溶解后，在氨水-柠檬酸铵氨性（PH8．9～9．7）介质中，Cu^2＋与BCO生成蓝色络合物，借此可进行光度法分析铜。用硫酸加热冒白烟使试样完全溶解后，加盐酸使可能生成的五价锑还原。使其生成较不易水解的（SbCl6）^3-络离子，并消除砷的干扰，再以KMnO4标准溶液滴定将三价锑氧化为五价锑，滴定终点由高锰酸钾本身的红色指示。借锑价态变化测定锑含量取得了较好的效果。
After samples are dissolved in hydrochloric acid or nitric acid, in ammoniac medium of ammonia -ammonium citrate , Cu^2＋ and BCO form blue complex, with which photometric method is used to analyze copper. After the samples are completely dissolved with sulphuric acid to heat them and make them show white smoke, hydrochloric acid is added to reduce the likely formed quinquevalent antimony and cause it to form hard -hydrolyzed （SbCl6）^3- complex ion and clear up arsenical disturbance. Then KMnO4 standard solution is used to titrate and oxidize trivalent antimony to quinquevalent antimony, the titrating endpoint being the red indication of potassium permanganate proper. Valent state change used to determine the content of antimony brings better results.
出处
《莱钢科技》
2006年第5期43-44,50,共3页
Laigang Science & Technology
关键词
锡基合金轴承合金
光度法
铜
锑价态变化
KMnO4标准溶液
锑
tin-base bearing alloy
photometric method
copper
antimony＇s valent change
KMnO4 standard solution
antimony
