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本文以金属—酸还原体系为基础,较为详细地试验了在不同氢化介质(酸)条件下,锌粒作还原剂氢化物分离砷的效果和行为,试验结果表明,砷化氢(AsH_3)在盐酸介质中有很快的逸出速度,若以一定的盐酸—硫酸混酸作氢化介质,用锌粒作还原剂也能达到与用硼氢化钾作还原剂等效的快速、定量分离砷的目的,且精密度较之用硼氢化钾作还原剂更佳。结合研究砷锑钼蓝显色条件、拟定了快速测定微量砷的分析方法,砷锑钼三元杂多酸在波长750nm处有最大吸收,表观摩尔吸光系数砷含量在0～30μg/10ml范围内符合比尔定律。可应用于钢铁、岩石、土壤及一些矿物样品中0.00x～3.00%砷的测定。
In this paper, based on the metal-acid reduction system, the effect and behavior of zinc particles as reductant hydride in separation of arsenic under different hydrogenation media (acid) conditions were tested in detail. The experimental results showed that arsenic hydride Hydrochloric acid medium has a fast escape rate, if a certain hydrochloric acid - sulfuric acid mixed acid as a hydrogenation medium, with zinc particles as a reducing agent can also be used with potassium borohydride as a reducing agent equivalent to rapid and quantitative separation of arsenic purposes , And the precision is better than potassium borohydride as reductant. Arsenic antimony molybdenum ternary heteropolyacid has been developed for the determination of trace arsenic. The maximum absorption at a wavelength of 750 nm and the apparent molar absorptivity of arsenic range from 0 to 30 μg / 10 ml Be consistent with Bill’s law. It can be applied to the determination of 0.00x ~ 3.00% arsenic in steel, rock, soil and some mineral samples.