农药有效成分含量不足和农药有效成分滥用是农药质量不合格的最主要问题,但是缺乏农药的快速现场分析方法。采用傅里叶近红外光谱技术结合偏最小二乘法(PLS),定量分析了乳油中有效成分高盖的含量,模型的决定系数R^2大于0.9999,SEC小于0.019,SEP小于0.030;同时对影响模型的因素进行了研究,并用实际样品进行了验证。结果表明:近红外光谱技术可以准确地定量分析农药乳油中有效成分含量,仪器分辨率、助剂含量变化对模型的影响不显著。近红外光谱法测量商品农药制剂中有效成分的含量,方便快速,特别适合现场、在线分析,对生产企业的连续在线检测、监督部门进行农药质量控制和农产品安全具有重要意义。
The main problem of disqualification of the agrochemicals is the insufficiency and abuse of its active ingredient,but lacking of the rapid and on the site analysis method.In the present thesis,the content of haloxyfop-r-methyl in the emulsifiable concentration was analyzed quantitatively by the FT-NIR spectroscopy combined with partial least square (PLS) method.The calibration models of haloxyfop-r-methyl were developed,the determination coefficients (R^2) of the calibration models were no less than 0.999 9,the SEC were less than 0.019,and the SEP were less than 0.030.Meanwhile,the factors affecting the calibration model were studied and the validation was done by the actual sample.The result indicated that the method of near-infrared spectroscopy can predict the content of the active ingredient in emulsifiable concentration accurately;while the resolution of the instrument and the content of addition agent will not affect the prediction precision of the calibration model remarkably.Therefore,it is a feasible,convenient and quick method to analyze the active ingredient in the commodity agrochemicals by near-infrared spectroscopy,which has an important significance in the on-line determination,analysis on site in the enterprise and the rapid quantitative analysis of agrichemicals in the department of quality monitoring.