摘要
文章利用二苯碳酰二肼试剂在酸性条件下与六价铬反应，生成二苯碳酰二肼铬，化合物呈紫红色．在波长540nm处有最大吸收峰。对制冷机中溴化锂溶液中的总铬进行测定，对总铬测定则采用先氧化，使铬全部转化为六价，然后再与二苯碳酰二肼反应。实验测定铬范围为O．020-0．20mg／L，精密度±5％。样品回收率98％～102％，对样品稍加处理便能测定，方法简便。
In the paper, spectrophotometric determination of chromate in lithium bromide refrigerant has beenstudied. With diphenylcarbazide as color reagent, and under appropriate test conditions, the content of chromate in lithium bromide refrigerant has been determined with satisfactory result. Recovery rate as highas 98 %-102 % has been obtained with identifying tags. So the method of determination is simple,speedy, accurate and reliable.
出处
《广东化工》
CAS
2012年第17期146-146,148,共2页
Guangdong Chemical Industry
关键词
溴化锂
铬酸盐
分光光度法
二苯碳酰二肼
lithium bromide
chromate
spectrophotometry
diphenylcarbazide
