气相色谱法检测面粉中磷化氢残留量

Determination of Phosphine in Flour by Gas Chromatography

中文关键词:  气相色谱法,磷化氢

英文关键词:gas chromatography,hydrogen phosphide

中文摘要:

      通过顶空气相色谱外标法快速、准确的测定粮食中残留的磷化氢含量.采用Porapak-Q 填充柱，火焰光度检测器（FPD）进行分析测定.当磷化氢浓度在2.5～25.0 ng/mL范围内时，呈现良好线性关系（R²=0.9999）.磷化氢含量为0.01和0.10 μg/g时的平均加标回收率分别为93.7 ％和96.5 ％.此方法的操作简便，稳定性好，对同一浓度样品6次平行测定的RSD为0.9％.根据样品的质量，此方法的检出限可达到0.001 μg/g，可作为粮食中磷化氢残留量快速测定.

英文摘要:

      Content of PH3 in food supplies is determined by external method of gas chromatography promptly and accurately. In this study, FPD and Porapak-Q packed column were used. Good linearity was achived (R²=0.9999) when content of PH3 is between 2.5~25.0 ng/mL. standard addition recovery of PH3 was 91.1% ~95.2 and 96.1%~97.4% when its content was 0.01 μg/g and 0.10 μg/g respectively. Comparing to traditional method, this method is more simple and stable and has been proved as a kind of relible method to determine the content of PH3 promptly, RSD of 6 parallel determinations of the same sample could be as low as 0.9%. Determination limit of this method could amount to 0.001 μg/g depending on the quality of samples.