Gong Jian, Huang Youda, Huang Wen, Ran Yong, Chen Diyun
Guangdong Provincial Key Laboratory of Radionuclide Pollution Control and Resources, School of Environmental Science and Engineering, Guangzhou University, Guangzhou, China.
State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China.
Environ Toxicol Chem. 2016 Oct;35(10):2474-2482. doi: 10.1002/etc.3419. Epub 2016 Jun 30.
Multiphase partitioning of endocrine-disrupting chemicals (EDCs) in the Pearl River (China) were investigated. The colloidal concentrations for 4-tert-octylphenol, 4-nonylphenol, bisphenol A (BPA), and estrone (E1) were in the ranges of 0.2 ng/L to 0.8 ng/L, 23.2 ng/L to 108 ng/L, 2.3 ng/L to 97.6 ng/L, and not detectable (nd) to 0.32 ng/L, respectively; for truly dissolved concentrations, the ranges were 0.5 ng/L to 5.4 ng/L, 39 ng/L to 319 ng/L, 13.7 ng/L to 91.2 ng/L, and nd to 1.2 ng/L, respectively. Positive correlations of EDCs with colloidal organic carbon (COC) were observed. The in situ COC normalized partitioning coefficients (log K ) for 4-tert-octylphenol (5.35 ± 0.42), 4-nonylphenol (5.69 ± 0.50), and BPA (5.51 ± 0.77) were within the ranges reported by other studies, whereas they were 1 to 2 orders of magnitude higher than their particulate/truly dissolved phase partition coefficients (log KOCint), revealing much strong sorption of EDCs by aquatic colloids. Moreover, colloid-bound percentages of 4-tert-octylphenol, 4-nonylphenol, and BPA ranged, respectively, from 6.9% to 36.4%, from 16.7% to 63.1%, and from 3.6% to 52.4%; their estimated mass fractions were 0.29 ± 0.21, 0.38 ± 0.26, and 0.39 ± 0.33, respectively. Obviously the colloid-bound fractions are significant. Furthermore, a medium risk of estrogenic effects was estimated from the truly dissolved concentrations of EDCs in the Pearl River, which was lower than the estimated high risk according to the conventionally dissolved concentrations. It is suggested that the presence of colloids be incorporated into future water quality prediction and ecological risk assessment. Environ Toxicol Chem 2016;35:2474-2482. © 2016 SETAC.
对中国珠江中内分泌干扰物（EDCs）的多相分配进行了研究。4-叔辛基苯酚、4-壬基苯酚、双酚A（BPA）和雌酮（E1）的胶体浓度范围分别为0.2 ng/L至0.8 ng/L、23.2 ng/L至108 ng/L、2.3 ng/L至97.6 ng/L以及未检出（nd）至0.32 ng/L；对于真正溶解的浓度，范围分别为0.5 ng/L至5.4 ng/L、39 ng/L至319 ng/L、13.7 ng/L至91.2 ng/L以及nd至1.2 ng/L。观察到EDCs与胶体有机碳（COC）呈正相关。4-叔辛基苯酚（5.35±0.42）、4-壬基苯酚（5.69±0.50）和双酚A（5.51±0.77）的原位COC归一化分配系数（log K）在其他研究报道的范围内，然而它们比其颗粒/真正溶解相分配系数（log KOCint）高1至2个数量级，这表明水生胶体对EDCs的吸附要强得多。此外，4-叔辛基苯酚、4-壬基苯酚和双酚A的胶体结合百分比分别为6.9%至36.4%、16.7%至63.1%和3.6%至52.4%；它们的估计质量分数分别为0.29±0.21、0.38±0.26和0.39±0.33。显然，胶体结合部分是显著的。此外，根据珠江中EDCs的真正溶解浓度估计存在中等程度的雌激素效应风险，这低于根据传统溶解浓度估计的高风险。建议在未来的水质预测和生态风险评估中纳入胶体的存在情况。《环境毒理学与化学》2016年；35：2474 - 2482。© 2016 SETAC。
