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[目的]研究在同柱条件下甲氰.乐果20%乳油中乐果和甲氰菊酯分离测定方法,为企业生产的质量控制和质检机构质量检测提供参考。[方法]以5%OV-101色谱柱固定相,邻苯二甲酸正戊酯为内标物,利用FID检测器通过程序升温方法对甲氰.乐果20%乳油中2种组分进行气相色谱分离和测定。[结果]甲氰.乐果20%乳油中2种组分、杂质得到有效分离,乐果和甲氰菊酯的标准偏差分别为0.049、0.045;变异系数分别为0.30%、1.07%;回收率分别为99.43%~101.07%、99.50%~100.67%;线性相关系数分别为0.999 6、0.999 8。[结论]采用该方法测定甲氰.乐果20%乳油2种有效成分的质量分数,分离效果好,准确度、精密度高,线性关系好,符合定量分析要求。
[Objective] The study aimed to study the separation and determination of dimethoate and dimethoate 20% EC in the same column for the quality control of the production and quality inspection of quality inspection agencies. [Method] With 5% OV-101 column stationary phase and n-pentyl phthalate as internal standard, the two components of cyanogen dimethoate 20% EC were gas-phase by FID detector Chromatography and determination. [Result] The results showed that the two components and 20 kinds of dimethoate dimethoate and the impurities were effectively separated. The standard deviations of dimethoate and fenpropathrin were 0.049 and 0.045, respectively, and the coefficients of variation were 0.30% and 1.07% respectively. The recovery Respectively 99.43% ~ 101.07%, 99.50% ~ 100.67%; the linear correlation coefficients were 0.999 6,0.999 8 respectively. [Conclusion] The method was used to determine the mass fraction of two active ingredients of methyl cyanogen dimethoate 20% EC, good separation effect, high accuracy, high precision and good linearity, in line with the quantitative analysis requirements.