济南市大寺河沿岸土壤重金属污染风险评价及溯源解析

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Risk Assessment and Source Apportionment of Heavy Pollution Metals in Riparian Soils of Dasi River in Jinan City

YANG Zhengshui 1 ， YANG Liyuan’， DAI Jierui²， WANG Hongjin 2 ， LIU Enfeng？

（1.School of Water Conservancy and Environment，University of Jinan，Jinan 25oO22，Shandong，China; 2. Shandong Institute of Geological Survey， Jinan 25Oo14，Shandong，China; 3.School of Geography and Environment， Shandong Normal University，Jinan 25O358，Shandong，China）

Abstract：To studythecharacteristicsand sourcesof heavymetalpolutioninthesoil along DasiRiverin Jinan City，68 soil sampling points were arranged along Dasi River，andthe soil contents of heavy metal elementsof As，Cd，Cr，Cu， Hg，Ni， Pb ，and Zn were respectively analyzed.The polution level of metals in soil was evaluated byusing the geoaccumulation index and potential ecological risk index，andthe sources of heavymetal polution were analyzed by using the positive definite matrix factor（PMF）analysis.The results show thatthe contents of the selected eight elements are lower thanthe screening values of soil polutionriskof agriculturalland insoil environmental qualitystandards.Theaverage contents of As，Cd，Hg and Zn are higher than those of in soil of Jinan City，indicating different enrichment trends and variability. The element order of the geo-accumulation index from high to low is Cd，As，Zn， Hg ，Cr，Cu， Pb ，Ni. The soilsin the study area are predominantly contaminated by Hg and Cd ，and there are also pollutions of Cu ，Pb and Zn to varyingdegrees.Thecomprehensive potentialecologicalriskindexis109.35，ndicating thatthecomprehensive ecological risk is low.Natural sources，natural-industrial sources，agricultural sources，transportationsourcesand comprehensive sources are the main sources of heavy metals in soil，with a contribution rate of 29.1%， 22.5% ， 10.1% ， 22% and 16.3% ， respectively.ThesoilalongDasiRiver iscurrentlyinanunpollutedorslightlypolutedstate，nd theenvironmentalquality is good.

Keywords：heavymetalelement；pollutioncharacteristics；positivedefinitematrixfactor；source apportionment;DasiRiver

城市河流是指发源于城区的河流或流经城区的河段，以及在城市发展过程中人工开挖形成的运河或水渠[1]。（剩余9028字）