原子荧光光度法测定纺织品中痕量铅

Determination of Trace Lead in Textiles by Atomic Fluorescence Spectrophotometry

铅是一种有蓄积性的有害元素,对人体健康有严重影响,被列为纺织品中的重要检测项目。对于纺织品中痕量铅的检测,试验方法是纺织品经微波消解后,用原子荧光光度计对其铅含量进行检测,样品做3个平行样,验证结果的重复性,分析原子荧光光度计的仪器检出限,确定此方法的检测低限,并对仪器精密度、准确度进行方法验证以此证明试验的准确性。结果表明:用原子荧光光度计测纺织品中的痕量铅,校准曲线在0~10μg/L的范围内具有良好的线性关系,仪器检出限为0.31 ppb,独立结果的相对标准偏差为0.77%,方法精密度为1.85%,加标回收率为92.03%~101.96%。

Lead is an accumulative element, which has a serious impact on human health and is listed as an important testing item in textiles. For the determination of trace lead in textiles, atomic fluorescence spectrophotometer was used to detect lead content of textiles after microwave digestion. Three parallel samples were taken to verify the repeatability of the results. The detection limit of atomic fluorescence spectrophotometer was analyzed to determine the detection lower limit, and the precision and accuracy of the instrument were verified to prove the accuracy of the experiment. The results showed that the calibration curves of trace lead in textiles were linear in the range of 0-10 μg/L by atomic fluorescence spectrophotometer. The detection limit of the instrument was 0.31 ppb, the relative standard deviation of independent results was 0.77%, the precision of the method was 1.85%, and the recoveries were 92.03%-101.96%.