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目前,猪肝中铅含量主要采用的是湿法消解-标准曲线法进行定量测定[1],即通过标准物质与被测样品之间吸光值的比较进行定量。该法具有配制简单、测试速度快等优点,但由于标准曲线的基质与被测样品的基质存在差异,所以采用标准曲线法测定不可避免的存在一定的基质效应,影响检测结果的准确性。标准加入法可以在一定程度上降低基质效应的影响,对于低含量的样品,标准加入法可以有效地提高测定的准确度[2]。本文结合2种方法的特点,对猪肝中铅
At present, the main content of lead in pig liver is the wet digestion - the standard curve method for quantitative determination [1], that is, through the comparison of the absorbance between the standard and the sample to be quantified. The method has the advantages of simple preparation and fast testing speed. However, due to the difference between the matrix of the standard curve and the matrix of the sample to be tested, the determination of the standard curve method inevitably has some matrix effect and affects the accuracy of the detection result. The standard addition method can reduce the effect of the matrix effect to a certain extent. For the low content of the sample, the standard addition method can effectively improve the determination accuracy [2]. This article combines the characteristics of two methods of pig liver lead