Li Jing
Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
Int J Environ Res Public Health. 2014 Nov 28;11(12):12441-53. doi: 10.3390/ijerph111212441.
The magnitude and ecological relevance of metal pollution from the upstream of water sources after emergency pollution events was investigated by applying a set of complementary sediment quality assessment methods: (1) geochemical assessment based on background value (the geoaccumulation index); (2) comparisons with sediment quality guidelines (SQGs); (3) an evaluation of the combined pollution according to the risk index (RI); and (4) investigation of the chemical patterns of target heavy metals (Cd, Zn, Cr, Pb, Ni). The geoaccumulation indices (Igeo) suggested that the magnitude of heavy metal pollution of the sediment of Yanghe River decreased in the order of Cd > Zn > Pb > Cr > Ni. Risk analysis also suggested that Cd and Zn concentrations were sufficiently elevated as to cause adverse biological effects in this study area. According to the RI values, 27% of total sampling sites showed considerable ecological risk for the water body, and 53% of total sampling sites showed very high ecological risk for the waterbody. Sediment-bound Cd was found to be predominantly associated with the exchangeable phase of the sediment (25%-68%), while Cr, Ni, Zn and Pb showed the strongest association with the residual fractions (60%-92%, 53%-67%, 24%-85% and 35%-67%, respectively).
通过应用一套互补的沉积物质量评估方法，研究了突发污染事件后水源地上游金属污染的程度及其生态相关性：（1）基于背景值的地球化学评估（地积累指数）；（2）与沉积物质量基准（SQGs）进行比较；（3）根据风险指数（RI）评估复合污染；（4）调查目标重金属（镉、锌、铬、铅、镍）的化学形态。地积累指数（Igeo）表明，洋河沉积物中重金属污染程度依次为镉>锌>铅>铬>镍。风险分析还表明，在本研究区域，镉和锌的浓度升高到足以造成不利的生物效应。根据RI值，27%的采样点对水体显示出相当大的生态风险，53%的采样点对水体显示出非常高的生态风险。发现沉积物结合态镉主要与沉积物的可交换相相关（25%-68%），而铬、镍、锌和铅与残留态的相关性最强（分别为60%-92%、53%-67%、24%-85%和35%-67%）。
