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2．5～25．0ng／mL范围内时，呈现良好线性关系（R^2=0．9999）．磷化氢含量为0．01和0．10μg／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0．001μg／g，可作为粮食中磷化氢残留量快速测定．
Content of PH3 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 （Rz =0. 9999） when content of PH3 is between 2.5-25.0 ng/mL, standard addition recovery of PH3 was 91.1%--95.2 and 96.1%-97.4% when it＇s content was 0. 01 μg/g and 0. 10μg/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 PHs 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.
出处
《分析测试技术与仪器》
CAS
2008年第2期92-95,共4页
Analysis and Testing Technology and Instruments
关键词
气相色谱法
磷化氢
gas chromatography
hydrogen phosphide
