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分光光度法测定制冷剂中的总铬 被引量:2

Spectrophotometric Determination of Total Chromium in the Refrigerant
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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.
作者 周培 束影
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
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  • 1K Tanno. The corrosion inhibition of carbon steel in lithium bromide solution by hydroxide and molybdate at moderate temperatures[J]. Corrosion Science, Vo134, 1993, 1453-1461.
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  • 3郭建伟,梁成浩.溴化锂吸收式制冷机的腐蚀与常用缓蚀剂[J].制冷,1999,18(2):22-26. 被引量:10
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  • 5高若梅,刘鸿皋,赵志强.近十年吸光光度法测定痕量铬的进展[J].理化检验(化学分册),1995,31(5):304-307. 被引量:18

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