QuEChERS-气相色谱-质谱法测定糙米中氯唑磷含量的不确定度评定

Uncertainty evaluation for determination of isazofos residues in brown rice by QuEChERS-gas chromatography-mass spectrometry

中文关键词:  氯唑磷  气相色谱-质谱法  不确定度  糙米

英文关键词:isozofos  gas chromatography-mass spectrometry  uncertainty  brown rice

中文摘要:

      目的 评定QuEChERS-气相色谱-质谱法测定糙米中氯唑磷残留方法的不确定度。方法 以糙米为例, 对QuEChERS-气相色谱-质谱法测定糙米中氯唑磷残留的不确定度进行评定, 包含标准溶液配制、样品称量、测量精密度(重复性)、测量准确性(回收率)等引入的不确定度。结果 糙米中氯唑磷的含量为0.0890 mg/kg时, 测定结果的扩展不确定为0.00829 mg/kg, k=2。结论 测量结果的不确定度主要来源为标准系列溶液的配制, 在实际检测工作中, 可通过增大移取标液体积和增大定容体积, 提高检测质量。

英文摘要:

      Objective To evaluate the uncertainty for the determination of isazofos residues in brown rice by QuEChERS-gas chromatography-mass spectrometry. Methods In the case of brown rice, the uncertainty of the determination of isazofos residues by QuEChERS-gas chromatography-mass spectrometry was evaluated, including the uncertainty of the standard solution preparation, uncertainty introduced in the measurement repeatability, uncertainty of the introduction of measurement recovery, and uncertainty introduced in sample weighing. Results When the content of isazofos in brown rice was 0.0890 mg/kg, the extended uncertainty was 0.00829 mg/kg with k=2. Conclusion The main source of uncertainty in measurement results is the preparation of standard series of solutions. Therefore, in the actual testing work, the detection quality can be improved by increasing the volume of the standard solution and the constant volume.