摘要
以黄河泥沙为例,用SPE HPLC MS MS的方法分析了双酚A在泥沙上的吸附规律及其影响因素.结果表明,由于黄河泥沙碳酸盐含量较高,双酚A的等温吸附规律不能用线性吸附方程和Freundlich吸附方程来描述;去除泥沙中碳酸盐后,泥沙对双酚A的吸附量增加,且其吸附规律可用线性吸附方程和Freundlich吸附方程来描述.泥沙总有机质含量和可溶态有机质含量都会影响双酚A的吸附,沉积物和悬浮物对双酚A的吸附量分别与其可溶态有机质含量负相关;由于价态不同,钙离子和钾离子对双酚A的吸附影响规律相反,随着钙离子浓度的增加双酚A吸附量亦增加,而随着钾离子浓度的增加双酚A吸附量却减少.
Bisphenol A (BPA) is widely used for the production of epoxy resins and polycarbonate plastics, and is also found in many wastewaters or surface waters. Besides mixing within the water column, BPA is subject to biodegradation, adsorption to soils and suspended solids and sediments, and possibly photodegradation. Adsorption of BPA on sediments sampled from several representative hydrologic stations of the Yellow River was studied, and factors that may affect the sorption of BPA were analyzed using the LC-MS/MS after solid-phase extraction. The results show that neither linear nor Freundlich isotherms is fit to the experimental data due to the high carbonate content in sediments (6%～17.5%). To analyze the effect of the carbonate on the BPA adsorption, carbonate in the sediment was eliminated using the method reported by Loeppert et al. BPA has greater adsorption after the elimination of the carbonate in the sediment, and the adsorption of BPA on the treated sediment can be described by both the linear and the Freundlich isotherms. The adsorption of BPA is related to the total organic matter and dissolved organic matter, and negative correlation is observed between adsorption amounts and dissolved organic carbon proportions for the suspended solids and sediments respectively. The effects of Ca^(2+) and K^+ on the adsorption of BPA were also analyzed, and it was found somewhat different because of their different valences. The adsorption amount of BPA increases with increasing Ca^(2+) and decreases with increasing K^+ within the ion concentration range of 0～4?mmol·L^(-1). The adsorption proportion of BPA decreases with increasing water-sediment ratio. However, the adsorption proportion for suspended solid declined faster than that for bottom sediments from San Menxia, whilst both reach to nearly the same value as the water-sediment ratio exceeds 75.
出处
《环境科学学报》
CAS
CSCD
北大核心
2004年第6期975-981,共7页
Acta Scientiae Circumstantiae
基金
国家重点基础研究发展规划资助项目(G1999043603)
