State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
State Environmental Protection Key Laboratory of Ecological Effect and Risk Assessment of Chemicals, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
Environ Sci Pollut Res Int. 2021 May;28(20):25207-25217. doi: 10.1007/s11356-021-12421-y. Epub 2021 Jan 16.
In this study, the distribution of phthalate esters (PAEs) in twenty surface sediment and five core sediment samples in Taihu Lake, China, was investigated, and their ecological risks were assessed. Of the 10 PAE congeners, five PAEs including diethyl phthalate (DEP), dimethyl phthalate (DMP), di-n-butyl phthalate (DBP), di-iso-butyl phthalate (DIBP), and bis(2-ethylhexyl) phthalate (DEHP) were identified and quantified, and the rest 5 PAEs were below the limits of quantification. The concentrations of the total PAEs (ΣPAEs) in surface sediments and core sediments varied from 1.12 × 10 to 18.71 × 10 ng/g and 0.23 × 10 to 5.22 × 10 ng/g, respectively. The dominant PAEs were DBP and DIBP, contributing 85.90% to the ΣPAEs. Overall, the highest concentrations of ΣPAEs occurred in northern lake, followed by eastern lake and western lake, and southern lake was the least polluted area. The spatial distribution of ΣPAEs in sediments showed that the PAE distribution pattern was influenced by the riverside environment. The historical trend of the past 100 years was reconstructed in the core sediment via a Pb dating technique. The vertical profile of the PAE congeners indicated that concentrations of PAEs started to increase since the 1990s in northern core sediments. It was estimated that the inventories of ΣPAEs in Taihu Lake was 4868.01 t. The potential ecological risk assessment by hazard quotient (HQ) method revealed that DBP posed a moderate risk due to its relatively high concentrations, with DIBP posed a low risk, while DEP, DMP, and DEHP exhibited no risk to the aquatic system.
本研究调查了中国太湖 20 个表层沉积物和 5 个柱状沉积物样品中邻苯二甲酸酯（PAEs）的分布，并评估了其生态风险。在所分析的 10 种 PAE 同系物中，鉴定和定量了其中的 5 种，包括邻苯二甲酸二乙酯（DEP）、邻苯二甲酸二甲酯（DMP）、邻苯二甲酸二丁酯（DBP）、邻苯二甲酸二异丁酯（DIBP）和邻苯二甲酸二（2-乙基己基）酯（DEHP），其余 5 种 PAE 低于定量限。表层沉积物和柱状沉积物中总 PAEs（ΣPAEs）的浓度范围分别为 1.12×10-18.71×10ng/g 和 0.23×10-5.22×10ng/g。主要的 PAE 是 DBP 和 DIBP，占 ΣPAEs 的 85.90%。总体而言，ΣPAEs 的浓度在北部湖区最高，其次是东部湖区和西部湖区，南部湖区的污染程度最低。沉积物中 ΣPAEs 的空间分布表明，PAE 的分布模式受湖滨环境的影响。通过 Pb 年代测定技术，在柱状沉积物中重建了过去 100 年的历史趋势。PAE 同系物的垂直分布表明，自 20 世纪 90 年代以来，北部柱状沉积物中 PAEs 的浓度开始增加。据估计，太湖中 ΣPAEs 的储量为 4868.01t。通过危害商（HQ）方法进行的潜在生态风险评估表明，由于其相对较高的浓度，DBP 构成了中度风险，而 DIBP 构成了低风险，而 DEP、DMP 和 DEHP 对水生系统没有风险。
