采用钯基体改进剂石墨炉原子吸收法测定纺织品中的可萃取铅

纺织品标准中对铅的限量极为严格,但萃取汗液基体成分复杂,背景吸收干扰强烈,为解决纺织品中的可萃取铅检测的困难,建立了一种采用基体改进剂的石墨炉原子吸收光谱法,测定纺织品中的可萃取铅。通过比较两种基体改进剂,优化实验条件,确定了以钯-硝酸镁为基体改进剂、灰化温度1 200℃、原子化温度2 300℃的实验条件。结果表明,以钯-硝酸镁为基体改进剂更能有效降低纺织品可萃取铅的基体干扰,并且具有良好的精密度(2.6%~3.3%)和准确度(加标回收率94.3%~105.6%)。

Determination of Trace Extractable Lead from Textiles by GFAAS Using Pd Matrix Modifier

A method for the determination of trace extractable lead in artificial acid sweat from ecological textiles by graphite furnace atomic absorption spectrometry（GFAAS）is described.Using（NH4）2H2PO4 and Pd（Cl）2-Mg（NO3）2 matrix modifiers were compared,ash temperature and atomization temperature were optimized.The results showed that using Pd（Cl）2-Mg（NO3）2 matrix modifier,1 200 ℃ ash temperature and 2 300 ℃ atomization temperature was an effective way to inhibit volatile1ead and reduce background signals.Under the optimum experimental conditions,the method precision was 2.6%~3.3%,and the recovery rate can reach 94.3%~105.6%.