Abstract:The impacts of citric acid on sorption of pentachlorophenol (PCP) by three typical zonal soils in China, including yellow-brown soil, brown-red soil, and red soil, were investigated by a batch experimental technique. The sorption isotherm of PCP by soils can be well described by Freundlich equation. The sorption capacity of PCP by three test soils was in the order of yellow-brown soil > brown-red soil 3 red soil, which was positively correlated to the soil organic matter contents (foc). The presence of citric acid dramatically affected the PCP sorption. The sorption capacity of PCP by brown-red soil and red soil increased firstly and decreased thereafter with the increment of citric acid concentrations from 0 to 100 mmol/L. The addition of citric acid significantly enhanced the sorption of PCP in yellow-brown soil. However, the enhancement tended to weaken with the presence of citric acid at higher concentrations. It was observed that the pH values lowered and dissolved organic matter (DOM) concentrations enlarged in the equilibrium solution with the increase of added citric acid concentrations. The sorption of PCP by soil enhanced at the lower pH value and weakened by the higher DOM concentration in solution.
孙瑞, 凌婉婷, 党红交, 孙冰清. 柠檬酸对土壤吸附五氯酚的影响[J]. 中国环境科学, 2011, 31(8): 1321-1326.
SUN Rui, LING Wan-Ting, DANG Hong-Jiao, SUN Bing-Qing. Effect of citric acid on the sorption of pentachlorophenol in soils.. CHINA ENVIRONMENTAL SCIENCECE, 2011, 31(8): 1321-1326.