Quantitative determination method of crystal form II in crystal forms for chlorothalonil pesticide

The invention discloses a quantitative determination method of a crystal form II in crystal forms for chlorothalonil pesticides, which adopts an X-ray powder diffraction method to determine the content of the chlorothalonil crystal form II, uses 2theta = 26.6 +/-0.2 degrees as a quantitative characteristic peak of the chlorothalonil crystal form II, and uses absolute intensity of the quantitative characteristic peak as a quantitative parameter to determine the content of the chlorothalonil crystal form II. And establishing a standard curve of the content of the chlorothalonil crystal form II and the quantitative characteristic peak intensity, and determining the content of the crystal form II in the chlorothalonil sample according to the standard curve. The method is high in accuracy, rapid and convenient, and the quality of chlorothalonil can be effectively guaranteed. 本发明公开了一种百菌清农药用晶型中晶型Ⅱ的定量测定方法，该方法采用X射线粉末衍射法测定百菌清晶型Ⅱ的含量，以2θ=26.618±0.2°作为百菌清晶型Ⅱ的定量特征峰，以该定量特征峰的绝对强度为定量参数，建立百菌清晶型Ⅱ的含量与该定量特征峰强度的标准曲线，根据该标准曲线测定百菌清样品