石墨探针收集/石墨探针炉原子吸收法直接测定APM中痕量铅

Direct Determination of Trace Lead in Atmospheric Particulate Matter by Graphite Probe Furnace Atomic Absorption Spectrometry after Collection with Graphite Probe Filters

研究一种直接收集并测定大气微粒物质（ＡＰＭ）中痕量有害元素铅的新方法．石墨探针直接收集ＡＰＭ后，用石墨探针炉原子吸收法直接测定收集在探针上的ＡＰＭ中痕量铅．方法特征量为４４．００ｐｇ，检出限（３σ）为４８．３６ｐｇ，相对标准偏差为３．２２％，铅浓度与峰面积吸光度在０—２５０μｇ／Ｌ范围内呈线性关系，测定标准参比材料，其回收率为９４．４２％—９９．１４％，并成功地测定了大气微粒物质中痕量铅的含量．

A new analytical method for direct collection and determination of trace toxic lead in atmospheric particulate matter(APM) has been investigated.After the APM was collected with graphite probe filters,the trace lead in APM was directly determined by graphite probe furnace atomic absorption spectrometry.The characteristic mass of lead was 44 00pg and the detection limit(3 σ ) was 48 36pg with RSD of 3 22%.The peak area is linear with concentration of lead in the range of 0-250μg/L.The results of analysis for Standard Reference Material(SRM)No.1648(USA) showed a recovery of 94 42%-99 14%.This method has been successfully applied to the determination of trace lead in APM.