作　　者： ; ; ; ; (林晓杨）; (李云松）;

机构地区： 广东出入境检验检疫局

出　　处： 《光谱学与光谱分析》 2009年第11期3150-3153,共4页

摘　　要： 纺织品萃取汗液中痕量Pb是生态纺织品标准重点限制项目,然而,由于生态纺织品标准中对Pb的限量极为严格,而且萃取汗液基体成分复杂,高浓度NaCl基体的背景吸收干扰强烈,使得纺织品萃取汗液中痕量Pb一直是生态纺织品检测的一个难点。文章采用石墨炉原子吸收光谱法(GFAAS)直接测定生态纺织品萃取汗液中的痕量元素Pb。通过对NH4H2PO4,NH4NO3,Pd(NO3)2,Ni(NO3)2,抗坏血酸等单个或混合基体改进剂进行筛选,并对石墨炉原子化工作条件和基体改进剂用量进行优化。试验结果表明,加入5μL50g·L-1NH4NO3与100mg·L-1Pd溶液(1∶1)混合试剂,可以有效地抑制Pb的挥发,降低背景信号。仪器检出限可达到0.7μg·L-1,方法精密度RSD为3.2%,实际纺织品样品加标回收率为95.5%～105%之间。 Extractable trace level lead in artificial sweat solution from ecological textiles is a key item limited by eco-textile standard. But the content of this extractable Pb is not so easy to determine for the strict limit of eco-textile standard,the complicatedness of extractable solution matrix and the strong background interference of NaCl. In the present paper 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. Based on a number of experiments by using different single and mixed matrix modifiers including （NH4）2H2PO4,NH4NO3,Pd（NO3）2,Ni（NO3）2 and ascorbic acid,an effective modifier and its quantity were selected and the graphite furnace operating parameters were optimized. Experimental test results revealed that adding 5 mL （1∶1） mixed solution of 50 g·L^-1 ammonium nitrate and 100 mg·L^-1 palladium regent was an effective way to inhibit volatile lead and reduce background signals. The detection limit could reach a low level of 0.7 μg·L^-1. The relative standard deviation was 3.2%. Under the optimum experimental conditions,the recoveries ranged between 95.5% and 105%.

关 键 词： 石墨炉原子吸收光谱法 生态纺织品 痕量

领　　域： [理学] [理学]