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本研究选用甲醇作为萃取溶剂,对塑料样品进行超声提取,选用C18 1.7μm×2.1×100 mm色谱柱,用超高效液相色谱对样品中亚乙基硫脲进行分离,串联二极管阵列和质谱联用仪进行分析测试。在优化的前处理和仪器分析条件下,亚乙基硫脲分析时间为3 min,线性范围为0.01~1 mg/L,PDA和MS两种检测器的线性相关系数均大于0.999,检出限达到1 mg/kg,相对标准偏差3.94%,加标回收率为92%~109%。本方法前处理方法简便,仪器分析快捷、准确,满足SVHC对于亚乙基硫脲的检测要求。
In this study, methanol was selected as the extraction solvent for ultrasonic extraction of plastic samples. The C18 1.7 μm × 2.1 × 100 mm column was used for the separation of ethylenethiourea in the sample by ultra performance liquid chromatography. The tandem diode array and mass spectrometry Use the instrument for analysis and testing. Under optimized conditions of pretreatment and instrumental analysis, the analysis time of ethylenethiourea was 3 min and the linear range was 0.01-1 mg / L. The linear correlation coefficients of PDA and MS were both greater than 0.999. The detection limits Reached 1 mg / kg, the relative standard deviation of 3.94%, spiked recoveries of 92% to 109%. The pretreatment method of the method is simple, the instrument analysis is quick and accurate, and meets the detection requirements of ethylene thiourea by SVHC.