珠江口典型河段内分泌干扰物的空间分布及风险评价

选择珠江口典型河段为研究对象,调查上覆水和沉积物中5种典型内分泌干扰物(EDCs)4-辛基酚(4-t-OP)、4-壬基酚(4-NP)、双酚A(BPA)、三氯生(TCS)和三氯卡班(TCC)的空间分布特征,并利用风险商值法(RQ)对其上覆水及沉积物进行风险评价.结果表明,5种EDCs在珠江河流上覆水和沉积物样品中均有检出,水体中4-t-OP、4-NP、BPA、TCC、TCS的水体质量浓度分别为:49.19~512.82、112.66~717.31、23.54~2189.88、1.90~120.99、1.51~54.75 ng·L~(-1).沉积物中4-t-OP、4-NP、BPA、TCC、TCS的沉积物质量分数分别为:56.60~1606.56、69.52~6524.35、18.55~522.45、1.54~179.66、0.71~130.92 ng·g-1.5种EDCs在沉积物和上覆水中的空间分布基本遵循上游到下游逐渐减少的趋势.4-t-OP、4-NP、BPA、TCC和TCS的风险商(RQ)在上覆水和沉积物中的范围分别为0.03~4.20和0.026~149.28.对生态健康产生极大压力.沉积物来源、粒度分布和有机质含量均对EDCs在沉积物中的富集有影响,且主要影响因素为沉积物有机质含量.

Spatial distribution and risk assessment of endocrine disrupting chemicals in the typical station of Pearl River

Five endocrine disrupting chemicals (EDCs) including 4-octyl phenol, 4-(4-t-OP) Nonylphenol (4-NP), Bisphenol A (BPA), Triclosan (TCS) and Triclocarban (TCC) were investigated in overlying water and sediment of Pearl River to assess its ecological risk. The concentrations of 4-t-OP, 4-NP, BPA, TCC, TCS in the surface water of Pearl River was 49.19~512.82, 112.66~717.31, 23.54~2189.88, 1.90~120.99, 1.51~54.75 ng·L^-1, respectively. The concentrations of 4-t-OP, 4-NP, BPA, TCC, TCS in the sediment of Pearl River was 56.60~1606.56, 69.52~6524.35, 18.55~522.45, 1.54~179.66, 0.71~130.92 ng·g^-1, respectively. From upstream to downstream, the content of 5 representative EDCs in the sediments and overlying water were gradually reduced. The risk quotient (RQ) of 4-t-OP, 4-NP, BPA, TCC, TCS in overlying water and sediment were 0.03~4.20 and 0.026~149.28, which shows high pressure on ecology health. The sediment sources, grain size distribution and organic matter content have influence on the enrichment ability of EDCs in sediment, among which the organic matter content was the main influential factor.