Partition coefficients of bisphenol A and 17β-estradiol onto sediment measured by batch experiment and field-based determination
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摘要: 基于实测的水体和沉积物中双酚A(BPA)和17β-雌二醇(E2)浓度,计算了目标污染物在沉积物和水相的分配系数(Kd)和有机碳归一化系数(Koc),在最佳的批试验条件下,模拟天然水体中BPA和E2的初始浓度,测定目标污染物在沉积物-水相中的分配行为,同时探讨了沉积物有机质对BPA和E2分配行为的影响。结果表明:批试验条件下得到的BPA的lg Kd(1.40)和lg Koc(3.51)与天然环境下得到的lg Kd(1.63~2.84)和lg Koc(2.66~4.66)相当;在批试验条件下得到的E2的lg Kd(1.10)和lg Koc(3.51)低于基于现场检测得到的lg Kd(4.77)和lg Koc(5.21),表明E2在批试验条件下的lg Kd和lg Koc并不能很好地描述在天然环境下的分配行为。BPA的Kd与沉积物中有机碳浓度呈正相关,有机碳浓度越高,沉积物对BPA的吸附能力越强。有机碳对E2的吸附影响并不显著。Abstract: The partition coefficient (Kd) and organic carbon normalized partition coefficient (Koc) of bisphenol A (BPA) and 17β-estradiol (E2) between the sediments and water were calculated based on the concentration of BPA and E2 in the natural riverine water. Batch experiments with field-measured concentration levels were performed to investigate distribution behavior of BPA and E2 in the sediment-water interface. The results showed that lg Kd (1.40) and lg Koc (3.51) of BPA derived from batch experiments were in the range of lg Kd (1.63-2.84) and lg Koc (2.66-4.66) obtained from field-based measurement in natural aquatic environment. The lg Kd (1.10) and lg Koc (3.51) values of E2 originated from batch experiments were lower than those from field-based measurement, indicating that the results from batch experiments could not properly describe distribution behavior of E2 in the natural environment to some extent. Organic matter in sediment had a positive correlation with sorption capacity of BPA onto sediment, whereas insignificant impact on sorption behavior of E2.
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Key words:
- endocrine disrupting compounds /
- riverine water /
- sediment /
- partition coefficient
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