Abstract:The occurrence of typical endocrine-disrupting chemicals (EDCs) binding to colloids in the two rivers of Pear River system, and their partitioning between colloidal and water soluble phases were studied with the applications of cross-flow ultrafiltration, solid phase extraction and gas chromatography-mass spectrometry. It was found that the concentrations of 4-nonylphenol (NP), bisphenol A (BPA) and estrone (E1) ranged in 23.2~108ng/L, 2.3~97.6ng/L, n.d. (not detected)~0.32ng/L, with mean values of 70ng/L, 31.4ng/L and 0.3ng/L, respectively. 17β-estradiol (E2), diethylstilbestrol (DES), 17α-ethynylestradiol (EE2) and estriol (E3) were not detected in all samples. There was no obvious variation of EDC concentrations between the surface and bottom water samples, except for the samples collected from Shilong. Moreover, it was observed that NP and BPA concentrations were both positively correlated with the colloidal organic carbon (COC) contents and the absorbance of UV (UV254), suggesting that COC was a key factor controlling the distribution of colloid-bound phenolic xenoestrogens, and the interaction between COC and these chemicals was related with the aromaticity. It was estimated that the percentage of colloid-bound EDCs varied 21%~67%
for NP, 4%~74 % for BPA, and 24%~26% for E1, respectively. Additionally the colloidal organic carbon normalized
partition coefficients (Kcoc) for NP (10(5.69±0.50)) and BPA (10(5.51±0.77)) were one order of magnitude higher than their suspended particle-water partition coefficients (Koc), indicating the powerful affinity of colloids played a critical role in partition, transportation and transformation of EDCs in the aquatic environment.
龚剑, 黄文, 杨娟, 冉勇, 陈迪云, 杨余, 吴翠琴, 占永革. 珠江河流胶体中的典型内分泌干扰物[J]. 中国环境科学, 2015, 35(2): 617-623.
GONG Jian, HUANG Wen, YANG Juan, RAN Yong, CHEN Di-Yun, YANG Yu, WU Cui-Qin, ZHAN Yong-Ge. Occurrence of colloid-bound endocrine-disrupting chemicals in the Pearl River, China. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(2): 617-623.