原子荧光光谱法测定固体废弃物——氧化皮中的砷

建立了固体废弃物——氧化皮中砷的测定方法。氧化皮粉末样品经盐酸溶解,在溶液中添加硫脲和抗坏血酸预还原砷,以盐酸(2+98)为载流,硼氢化钠(10g/L)和氢氧化钾(5g/L)混合溶液为还原剂,砷与硼氢化钠、盐酸反应生成砷化氢,砷化氢利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,测量砷产生的荧光强度。测试氧化皮中砷含量的相对标准偏差为不大于4.8%,检出限为0.12μg/L,回收率为97%～103%,结果准确度较好。方法具有试剂消耗少、快速、检出限低的优点。

Determination of Arsenic in Mill Scale Solid Waste by Atomic Fluorescence Spectrometry

A new analytical method for the established. Mill scale powder materials were were added to the solution to reduce arsenate. determination of arsenic in a mill scale solid waste is dissolved by hydrochloric acid. Thiourea and ascorbic acid Arsenic reacts with sodium borohydride and hydrochloric acid to generate arsine using 2% hydrochloric acid as carrier and the mixed solution containing 10 g/L sodium borohydride and 5 g/L potassium hydroxide as reducing agent. Arsine was introduced by argon gas stream into a quartz furnace atomizer to be atomized. The intensity of arsenic fluorescence excited by the hollow cathode lamps was measured. The relative standard deviation of arsenic is not more than 4. 8%. The detection limit is 0.12 /~g/L. And the recovery rate is between 97% and 103%. And the accuracy is better. The method has the advantages of less reagent consumption, rat）iditv and lc~w~r ct~＊~t~,~n 1;m~