作物和土壤中DEHP测定的前处理

Pretreatment for the Test of DEHP in Crops and Soil

介绍农田土壤和农作物样品中微量ＤＥＨＰ测定的前处理方法。该法选用三氯甲烷为抽提液，加入吸水剂进行革取、抽提和浓缩。与北京、丹麦和美国等测试方法相比较，革取时间为０．５—０．７ｈ，缩短了２—１１ｈ；溶剂用量为７５—９０ｍｌ，节省溶剂１１０—１２００ｍｌ；操作简便、分离效果好；样品中ＤＥＨＰ的回收率除棉花籽实外，其余均达９０％左右，变异系数约土３％。该法适宜在酞酸酯监测中推广应用。

This paper deals with the pretreatment method for testing DEHP from farm soil and crops with CHCl3 as a solvent and with the absorbent. Campared with those from Beijing, Denmark and United States of America, this method took a short extracting time of 0.5-0.7h, 2-11 h shorter than others, and the solvent of 75-90 ml, 110-1200 ml less than others. This method is easy to use and has a high effective separation. There was a DEHP recovery rate of about 90%, except for cotton seeds. The coefficient of variability was less than f 3 %. It's very suitable to test phthalic acid esters.