根据聚氨酯泡沫塑料的性质,先采用无水乙醇浸泡,再用HCl煮沸的方式对其进行预处理,并通过火焰原子吸收法测定金.实验确定了聚氨酯泡沫塑料在无水乙醇中最佳浸泡时间为4 h,该方法金回收率在95 %以上.通过对国家标准物质和实验室控制样品的测定表明,测定结果与推荐值吻合,其相对标准偏差(RSD)为0.58 %~3.70 %.该方法操作简单,测定结果稳定,能够满足地质样品中金的分析测试要求.
According to the properties of polyurethane foam plastics,the paper pre-treated the foam plastics by first soaking them in absolute ethyl alcohol and then boiling them in hydrochloric acids,and determined the gold by flame atomic absorption spectroscopy.The results showed that the optimal time for absolute ethyl alcohol immersion in foam pretreatment was 4 hours and the gold recovery of the method was above 95 %.Through the determination of different national standard substances and laboratory control samples,the results are consistent with the standard value and the relative standard deviations were 0.58 %-3.70 %.Therefore,the method is simple to operate,with consistent determination results,and can meet the requirements of geological sample analysis.
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