分析土壤内农药的主要困难是从土样內得到最高的萃取率和净化萃取液用有机溶剂直接萃取农药,通常的萃取率不是很高的,因为在萃取过程中含有大量的干扰物,许多研究者在选择萃取剂时,未考虑到土壤的类型,因此所得的资料有很大的差异.土壤作为一个整体,它吸附农药的程度与其所含粘土矿物质、腐植质的成分、矿物质的分散度等其它因子有关。 The main difficulty in analyzing pesticides in soils is to obtain the highest extraction rates from the soil samples and to purify the extracts. Direct extraction of pesticides with organic solvents usually does not result in very high extraction rates due to the large amount of interfering substances present in the extraction process. Many studies When selecting extractants, the type of soil is not taken into consideration, and the resulting data vary widely. The degree to which the soil, as a whole, adsorbs pesticides is related to the content of clay minerals, humic substances, and minerals Degree and other factors.