School of Chemical & Environmental Engineering, China University of Mining & Technology-Beijing, Beijing, 100083, PR China.
School of Chemical & Environmental Engineering, China University of Mining & Technology-Beijing, Beijing, 100083, PR China.
Environ Pollut. 2020 Aug;263(Pt A):114548. doi: 10.1016/j.envpol.2020.114548. Epub 2020 Apr 10.
Two typical polycyclic musks (PCMs), namely 1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethylcyclopenta-(g)-2-benzopyran (HHCB) and 7-acetyl-1,1,3,4,4,6-hexamethyl-1,2,3,4-tetrahydronaphthalene (AHTN), were determined in 63 surface water and 42 sediment samples collected from the North Canal River watershed, an urban catchment located in the megacity Beijing, China. Concentrations of HHCB and AHTN were 13.2 ng/L-395 ng/L and 2.98 ng/L-232 ng/L in surface water, while 4.10 ng/g-818 ng/g and 1.21 ng/g-731 ng/g in sediments. The results showed that PCM concentrations in the North Canal River watershed were at the high end when compared to that in other regions in China and worldwide. A watershed-wide annual mass budget showed that HHCB (∼150 kg/year) and AHTN (∼80 kg/year) mainly originated from urban wastewaters. Both PCMs were eliminated primarily by outflowing water (72 kg/year and 43 kg/year for HHCB and AHTN, respectively) and due to losses to the atmosphere (40 kg/year and 26 kg/year for HHCB and AHTN, respectively). An assessment of ecological risks posed by HHCB and AHTN to aquatic organisms in the North Canal River watershed was performed by using a tiered ecological risk assessment. The results showed that PCMs were unlikely to pose an ecological risk at the watershed scale (the probability of the incidence of adverse effect was <3.5% at the 99% protection level). However, according to the results from the risk quotient method, the tributaries draining wastewater effluents should be hotspots that warrant further research in future.
在中国特大城市北京的北运河流域，采集了 63 个地表水和 42 个沉积物样本，测定了其中两种典型的多环麝香（PCM），即 1,3,4,6,7,8-六氢-4,6,6,7,8,8-六甲基环戊并-[g]-2-苯并吡喃（HHCB）和 7-乙酰基-1,1,3,4,4,6-六甲基-1,2,3,4-四氢化萘（AHTN）的浓度。HHCB 和 AHTN 在地表水中的浓度范围分别为 13.2ng/L-395ng/L 和 2.98ng/L-232ng/L，在沉积物中的浓度范围分别为 4.10ng/g-818ng/g 和 1.21ng/g-731ng/g。结果表明，与中国其他地区和全球其他地区相比，北运河流域 PCM 浓度处于较高水平。流域范围内的年质量预算表明，HHCB（约 150kg/年）和 AHTN（约 80kg/年）主要来源于城市污水。这两种 PCM 主要通过流出的水（HHCB 和 AHTN 分别为 72kg/年和 43kg/年）和向大气中的损失（HHCB 和 AHTN 分别为 40kg/年和 26kg/年）而被消除。采用分级生态风险评估方法，对北运河流域水体生物中 HHCB 和 AHTN 带来的生态风险进行了评估。结果表明，在流域尺度上，PCM 不太可能造成生态风险（在 99%保护水平下，不利影响发生的概率<3.5%）。然而，根据风险商数法的结果，排放废水的支流可能是热点，需要在未来的研究中进一步关注。
