Adsorption of phosphate on tidal flat surface sediments from the Yangtze Estuary

被引：59

作者：

Liu, M ^{[1
]}

Hou, L ^{[1
]}

Xu, S ^{[1
]}

Ou, D ^{[1
]}

Yang, Y ^{[1
]}

Zhang, B ^{[1
]}

Liu, Q ^{[1
]}

机构：

[1] E China Normal Univ, Minist Educ, Open Lab Urban Environm Proc, Dept Geog, Shanghai 200062, Peoples R China

来源：

ENVIRONMENTAL GEOLOGY | 2002年 / 42卷 / 06期

关键词：

adsorption; China; phosphate; surface sediments; Yangtze Estuary;

D O I：

10.1007/s00254-002-0574-3

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Adsorption of phosphate (PO4-P) by sediments of nine sites taken from the Yangtze Estuarine and coastal tidal flats were studied in a laboratory. The results indicate that the process of phosphorus adsorption onto sediments mainly occurred within 0-10 h, and then reached a dynamic equilibrium. This experimental finding has shown maximum adsorption rates (ad-R) occurred within 0-0.5 h, ranging from 10.40-56.40 mg/kg h with regional differences. The adsorption rates were obviously related to concentrations of fine particles (<63 mum) in the sediments. Adsorption isotherm curves were fitted to the modified Langmuir equation. Adsorption capacities (ad-C) varied from 26.32 to 204.08 mg/kg, and showed good affinities for Fe 31 and TOC concentrations: The adsorption efficiency (ad-E) of phosphate on sediments ranged from 21.55 to 248.30 L/kg, showing a close correlation with TOC concentrations. A correlation between environmental factors and phosphate adsorption is presented in this experiment. Phosphate adsorption is susceptible to changes in pH, temperature and salinity conditions.

引用

页码：657 / 665

页数：9

共 35 条

[1] A MECHANISTIC MODEL FOR DESCRIBING THE SORPTION AND DESORPTION OF PHOSPHATE BY SOIL [J].