摘要
重金属铅含量的监测已成为天然农产品核桃重点检测指标之一。本文采用湿法消解-石墨炉原子吸收光谱法测定核桃中的Pb含量。在最优前处理条件和最佳仪器条件下,实验对20个不同产区(均为四川)核桃样品中的铅含量进行了测定,方法在0.00~200.00 ng/mL质量浓度范围内呈良好的线性关系,仪器检出限为0.005 mg/L。质控样品测定值的相对极差为9.93%,满足GB5009.12—2023所规定的精密度要求;质控样品测定值的相对误差为-7.50%~-16.25%,表明方法准确,测定结果可靠。
The monitoring of heavy metal lead content has become one of the key detection indicators for natural agricultural products such as walnuts.This article uses wet digestion graphite furnace atomic absorption spectroscopy to determine the Pb content in walnuts.Under the optimal pre-treatment and instrument conditions,the lead content in walnut samples from 20 different production areas(all from Sichuan)was determined.The method showed good linearity in the concentration range of 0.00~200.00 ng/mL,and the instrument detection limit was 0.005 mg/L.The relative range of the measured values of the quality control samples is 9.93%,which meets the precision requirements specified in GB5009.12-2023.The relative error of the measured values of the quality control samples is-7.50%~-16.25%,indicating that the method is accurate and the measurement results are reliable.
作者
刘强
牟春燕
黄礼丽
毛川
Liu Qiang;Mu Chunyan;Huang Lili;Mao Chuan(Sichuan Vocational College of Chemical Technology,Luzhou Sichuan 646300,China;Luzhou Research Institute of Forestry Science,Luzhou Sichuan 646099,China)
出处
《山西化工》
CAS
2024年第8期91-93,共3页
Shanxi Chemical Industry
