Institute of Applied Radiation of Shanghai, Shanghai University, Shanghai, 201800, People's Republic of China.
Environ Sci Pollut Res Int. 2015 Aug;22(16):11993-2000. doi: 10.1007/s11356-015-4336-7. Epub 2015 Apr 15.
Concentrations of hexabromocyclododecanes (HBCDs) were determined in surface sediments of Shanghai, China. The concentrations of total HBCD diastereoisomers (ΣHBCD) ranged from 0.01 to 13.70 ng g(-1) dry weight (dw) with a mean value of 3.41 ng g(-1) dw, which was up to several orders of magnitude lower than those reported for sediments from European countries. The ΣHBCD concentrations in sediments from chemical/textile industrial or densely populated areas were generally higher than those from rural or less chemical/textile industrialized areas in Shanghai. A high proportion of α-HBCD was observed in sediment samples and was significantly higher than that of commercial HBCD products. This might be due to thermal isomerization from γ-HBCD to α-HBCD and slower degradation rate of α-HBCD compared to γ-HBCD in anaerobic conditions. The mass inventory of ΣHBCD in surface sediments of Shanghai was estimated at 164.4 kg, representing a significant source of HBCDs to the Shanghai environment. This indicates that further study on potential transfer of HBCDs from sediments to aquatic organisms and ecological risk assessments is required.
在中国上海的表层沉积物中测定了六溴环十二烷（HBCDs）的浓度。总 HBCD 非对映异构体（ΣHBCD）的浓度范围为 0.01 至 13.70ng g(-1) 干重（dw），平均值为 3.41ng g(-1) dw，与欧洲国家沉积物中的浓度相比，低了几个数量级。在上海，来自化工/纺织工业区或人口密集区的沉积物中ΣHBCD 的浓度通常高于来自农村或化工/纺织业欠发达地区的沉积物。在沉积物样品中观察到高比例的α-HBCD，明显高于商业 HBCD 产品中的含量。这可能是由于γ-HBCD 在热异构化作用下生成α-HBCD，以及在厌氧条件下α-HBCD 的降解速度比γ-HBCD 慢。上海表层沉积物中ΣHBCD 的质量库存估计为 164.4kg，这表明 HBCDs 是上海环境中的一个重要来源。这表明需要进一步研究 HBCDs 从沉积物向水生生物的潜在转移以及生态风险评估。
