五种不同类型土壤中有机化合物土壤吸附系数的预测

Prediction of Soil Adsorption Coefficients of Organic Compounds in a Wide Range of Soil Types by Soil Column Liquid Chromatography

为了验证土壤柱液相色谱法测定农药的土壤吸附系数的普遍适用性和预测的准确性,采用了5种组成及性质差异较大、具有一定代表性的土壤样品,对在甲醇 水流动相条件下测定的保留因子与土壤吸附系数间的相关性进行了研究。结果表明,土壤柱液相色谱法是预测农药的土壤吸附系数的一种有效方法,适于多种类型土壤中农药土壤吸附系数的预测。

Using the methanol-water mixtures as mobile phases of soil column liquid chromatography (SCLC), prediction of soil adsorption coefficients (K_d) by SCLC was validated in a wide range of soil types. The correlations between the retention factors measured by SCLC and soil adsorption coefficients measured by batch experiments were studied for five soils with different properties, i.e., Eurosoil 1~#, 2~#, 3~#, 4~# and 5~#. The results show that good correlations existed between the retention factors and soil adsorption coefficients for Eurosoil 1~#, 2~#, 3~# and 4~#. For Eurosoil 5~# which has a pH value of near 3, the correlation between retention factors and soil adsorption coefficients was unsatisfactory using methanol-water as mobile phase of SCLC. However, a good correlation was obtained using a methanol-buffer mixture with pH 3 as the mobile phase. This study proved that the SCLC is suitable for the prediction of soil adsorption coefficients.