微波消解-石墨炉原子吸收光谱法测定ABS中铅、铬含量

摘要

采用微波消解为前处理手段，用石墨炉原子吸收光谱法测定了丙烯腈-丁二烯-苯乙烯共聚物（ABS）中铅、铬含量。对前处理条件，如消解温度、恒温时间、消解体系等进行了优化，实现了对ABS的完全消解。结果表明，方法检出限为：铅0．03mg／kg、铬0．02mg／kg；测定结果相对标准偏差小于7％；铅、铬元素的加标回收率在93％～103％之间。%A method was proposed to analyze the quantity of the lead and chromium in acrylonitrile- butadiene-styrene copolymer （ABS） using microwave digestion and atomic absorption spectrum. The pretreatment was optimized including temperature, digestion procedure and proportion of acids, in order to digest the materials completely. It was found that the detection limits for Pb and Cr were 0. 03 and 0.02 mg/kg, respectively. The relative standard deviations for Pb and Cr were all less than 7 % and the recovery was between 93% and 103 %.