一次性纸杯中重金属铅的含量测定

摘要

首次建立一次性纸杯中重金属铅的含量测定方法。取一定量的一次性纸杯炽灼灰化，残渣用水定容，取不同体积与硫代乙酰胺作用形成颜色梯度，与不同体积的标准铅与硫代乙酰胺作用形成颜色梯度比较，从而计算重金属的含量范围。该法操作简单、准确、可靠，重金属铅的检测限为百万分之二；该法适合测定纸杯中重金属铅含量。结果表明，试验中纸杯的重金属铅含量超标。%To establish a determination method for heavy metal Pb in paper cups .Igniting and ashing the paper cup of a certain quantity ,and dissolving the residue to a certain volume with water ,making the solution with various volume react with thiacetamide and color gradient can be formed ,comparing with which standard Pb ’ reaction ,accordingly to determine the content interval of heavy metals .The method is simple ,accurate and reliable.The limit of quantitation is 2 ppm.It can be used for the determination of heavy metal Pb in paper cups.The result of determination can be showed that heavy metal is excessive in paper cups .