邻苯二甲酸酯在黄河沉积物上的吸附特性

Adsorption of Phthalate Esters on Sediments of Yellow River

文章利用反相高效液相色谱技术研究了黄河兰州段沉积物对水中邻苯二甲酸二甲酯(DMP)的吸附动力学,以及DMP、邻苯二甲酸二乙酯(DEP)、邻苯二甲酸正二丙酯(DnPrP)和邻苯二甲酸二丁酯(DBP)在沉积物上共存的等温吸附行为,探讨了助溶剂甲醇、离子强度等对吸附的影响。结果表明,在一定的浓度范围内,DMP在沉积物上的吸附速率先快后慢;DMP、DEP在沉积物上的等温吸附行为符合线性方程,而DnPrP、DBP的吸附等温线以Freundlich方程拟合最佳;沉积物对DMP的吸附容量还随着离子强度和溶液中甲醇百分比含量的增大而降低。

Adsorption kinetics of dimethyl phthalate （DMP） and adsorption isotherms of DMP, diethyl phthalate （DEP）, di-n-propyl phthalate （DnPrP） and dibutyl phthalate （DBP） on sediments in Lanzhou section of Yellow River were studied with reverse-phase high performance liquid chromatography. Influence of ionic strength and solvent methanol on adsorption behavior was investigated. Results showed that adsorptive rates of DMP were quick at the beginning and then became slow gradually in a certain concentration range. Adsorption isotherms for DMP, and DEP were linear while isotherms for DnPrP and DBP were well fitted Freundlich equation. It was found that the adsorptive capacities of DMP at the sediment decreased with increasing ionic strength and content of solvent methanol.