进口铜精矿中砷和汞的快速测定

Rapid Determination of Arsenic and Mercury in Imported Copper Concentrates

中文关键词:  铜精矿；砷；汞  原子荧光分光光度法

英文关键词:copper concentrates  arsenic  mercury  AFS

中文摘要:

      试料经盐酸、硝酸溶解，添加硫脲和抗坏血酸预还原砷，以2%盐酸为载流，1%硼氢化钠和0.5%氢氧化钾溶液为还原剂，在氢化物发生器中，砷与硼氢化钠、盐酸反应生成砷化氢，汞则成为汞蒸气，用氩气导入石英炉原子化器中原子化，以空心阴极灯为激发光源，于原子荧光光谱仪上测量砷和汞的荧光强度。砷的标准偏差为0.0096%；汞的标准偏差为0.00015%，结果准确度较好。方法前处理快速，试剂消耗少，过程简单。

英文摘要:

      The testing materials are dissolved in hydrochloric acid and nitric acid. Thiourea and ascorbic acid are added to the solution to reduce pentavalent arsenic to trivalent arsenic. Arsenic reacts with potassium borohydride and hydrochloric acid and generates arsine in the hydride generator using 2% hydrochloric acid as the carrier and 1% sodium borohydride containing 0.5% potassium hydroxide as the reducing agent. Meanwhile, mercury becomes vapor. Arsine and mercury vapor are directed into a quartz furnace atomizer to be atomized by argon. The fluorescence intensity of arsenic and mercury are measured by an atomic fluorescence spectrometer through the excitation of hollow cathode lamps. The relative standard deviation of arsenic is 0.0096% and the one of mercury is 0.00015%, and the accuracy is favorable. The pre-treatment of the method is rapid and the reagent consumption is less resulting in a simple process.