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建立了一种快速测定缓释尿素中吡唑类硝化抑制剂(DL-1)的方法—液液萃取-气相色谱法。从5种有机溶剂中选出三氯甲烷作为DL-1的萃取剂,并采用盐析的方法将萃取率提高。本文采用内标法,通过SE 30柱,氢火焰离子化检测器(FID)定量检测三氯甲烷萃取相中DL-1。萃取率为96.08%~98.10%,平均萃取率为97.33%;回收率为87.96%~90.54%;RSD为0.089%~1.6%,本法测定缓释尿素中的DL-1含量快速、灵敏,便于产品的质量监控。
A rapid method for the determination of pyrazole nitration inhibitor (DL-1) in sustained-release urea was established by liquid-liquid extraction and gas chromatography. Trichloromethane was chosen as the extractant of DL-1 from five organic solvents and the extraction rate was increased by salting out. In this paper, DL-1 in chloroform extract was detected quantitatively by SE 30 column and hydrogen flame ionization detector (FID) using internal standard method. The extraction rate was 96.08% -98.10%, the average extraction rate was 97.33%, the recovery rate was 87.96% -90.54%, the RSD was 0.089% -1.6%. The determination of DL-1 in slow-release urea by this method was rapid and sensitive Product quality control.