上海城市污泥中HBCD的浓度及土地施用累积水平

Concentration Distribution of HBCD in Sewage Sludge and Accumulative Effect of Land Application in Shanghai

利用索氏提取、凝胶渗透色谱及高效液相色谱/质谱联用方法分析了上海市27个污水处理厂最终污泥中六溴环十二烷(HBCD)的浓度及分布情况。结果表明,污泥中HBCD的浓度范围为0.103～37.220 ng/g干重,平均值为4.700 ng/g干重,与世界其他地区相比,污染水平较低。在其中17个样品中,γ-HBCD是主要成分(44.7%～76.3%),在其他10个样品中,α-HBCD所占比例最高(49.6%～90.6%)。据估算,上海市通过污泥每年排放HBCD的量为1.5 kg。污泥如未经处理直接进行土地施用,土壤中HBCD的残留浓度会高出近似背景区一个数量级。

The concentrations of hexabromocyclododecane （HBCD） in dewatered sludge samples from 27 wastewater treatment plants in Shanghai were determined by using Soxhlet extraction, gel permeation chromatography and high-performance liquid chromatography coupled with tandem mass spectrometry. The mean concentration of total HBCD in 27 dewatered sludge samples was 4. 700 ng/g dry weight （dw） with a range from 0. 103 to 37. 220 ng/g dw, which was much lower than data reported worldwide. α-HBCD dominated in 17 sludge samples with 44.7% to 76.3%, while α-HBCD dominated in the remaining samples with 49.6% to 90.6%. The annual discharge of HBCD via dewatered sludge in Shanghai was estimated to be 1.5 kg. Furthermore, the concentration of HBCD in the soil amended with untreated sewage sludge was an order of magnitude higher than that in background soils.