The effects of soil pH and organic matter contents on the vertical migration of 4 priority controlled phthalic acid esters (PAEs) in soil was studied by the simulation leaching experiments.The soil pH was set as 5, 6, 7, 8, 9 and organic matter content 10, 20, 30, 40, 50 g/kg, respectively.In the soil column, the upper layer of soil was PAEs polluted soil (3 cm) and the clear soils (20 cm) without PAEs were under the PAEs polluted soil.The results showed that the total content of 4 PAEs was lowest in PAEs polluted soil and the clear soil when soil pH was 9.1, and the total leaching rate was highest (98.0%).There was no difference in the migration of DMP, DBP and DOP in polluted soil with various soil pH;however, DOP was liable to migrate in strong alkaline soil.The content of 4 PAEs in the clear soil was all higher in soil of pH 6.2.DMP and DEP were easy to migrate and their contents were high in deeper soil.By comparison, DBP和DOP were not easy to migrate and their contents were high in upper soil.The total content of 4 PAEs was lowest in PAEs polluted soil and the clear soil when soil organic matter was 9.9 g/kg, and the total leaching rate was highest (82.4%).There was no difference in the migration of DMP, DBP and DOP in various soil organic matter of polluted soil, but DOP was liable to migrate in soils of low organic matter.DEP, DBP and DOP were not easy to migrate with higher content in clear soil of 30.6~50.4 g/kg organic matter.%以4种优先控制邻苯二甲酸酯类(PAEs)为研究对象,设置土壤pH值为5.2、6.2、7.0、8.3、9.1,有机质含量为9.9、21.2、30.6、41.7、50.4 g/kg,采用土柱淋滤模拟实验,土柱上层为PAEs污染土(3 cm),下层为不含PAEs的清洁土(20 cm),研究了土壤酸碱性和有机质含量对PAEs纵向迁移的影响.结果表明,土壤pH值为9.1时淋滤后污染和清洁土中4种PAEs总含量最低,总淋出率最高,可达98.0%;污染土中邻苯二甲酸二甲酯(DMP)、邻苯二甲酸二乙酯(DEP)、邻苯二甲酸二丁酯(DBP)的迁移不受土壤pH值影响,但邻苯二甲酸二辛酯(DOP)在强碱性土壤中更易迁移;清洁土中各PAEs均是在pH为6.2时的含量较高,其中DMP和DEP在土壤底层含量最高,但DBP和DOP在土壤上层含量最高.土壤有机质含量为9.9 g/kg时4种PAEs总含量最低,淋出率最高,达82.4%;不同有机质条件下污染土中DMP、DEP和DBP的迁移没有差异,DOP在低有机质含量土壤中更易迁移;总体上有机质含量为30.6~50.4 g/kg的清洁土柱DEP、DBP、DOP的含量更高,不易迁移.
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