本文以铅、镉为研究对象,建立一种食用菌中重金属元素的检测方法,并通过相关能力验证项目评估检测方法的适用性.参照国家标准GB 5009.268-2016,采用微波消解仪和电感耦合等离子体质谱仪(Inductively coupled plasma mass spectrometer,ICP-MS)对食用菌样品进行检测.检测结果显示,铅、镉,在0～40 μg/L表现出良好的线性关系(R≥0.999).食用菌能力验证样品测定结果显示,编号155样品,铅含量为0.221 mg/kg,镉含量为0.102mg/kg;编号069样品,铅含量为1.11 mg/kg,镉含量为0.393 mg/kg.能力验证反馈结果显示,编号155样品,铅、镉的|Z|值分别为0.17、0.86;编号069样品,铅、镉的|Z|值分别为0.55、0.97.能力验证结果为满意,表明实验室已具备食用菌中铅、镉的检测能力,可以开展相应的检测服务.
Analysis proficiency testing results on determination of lead and cadmium in edible fungi
This paper focuses on lead and cadmium as research objects,and establishes a method for detecting heavy metal elements in edible fungi.The method is evaluated by relevant proficiency testing projects to assess its applicability.The edi-ble fungi samples are detected using a microwave digestion system and an inductively coupled plasma mass spectrometer(ICP-MS)according to the national standard GB 5009.268-2016.The detection results show that lead and cadmium exhibit good linear relationships within the range of 0-40 µg/L(R≥ 0.999).The results of the edible fungi proficiency testing sam-ples show that sample 155 has a lead content of 0.221 mg/kg and a cadmium content of 0.102 mg/kg;sample 069 has a lead content of 1.11 mg/kg and a cadmium content of 0.393 mg/kg.The feedback results of the proficiency testing show that sample 155 has a lead|Z|value of 0.17 and a cadmium|Z|value of 0.86;sample 069 has a lead|Z|value of 0.55 and a cadmium|Z|value of 0.97.The proficiency testing results are satisfactory,indicating that the laboratory has the ability to detect lead and cadmium in edible fungi and can provide corresponding detection services.
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