The Health Risk Assessment Of Heavy Metals In Riverside Park Soil And Water Of Minjiang River In Fuzhou Section

As an important recreation and leisure place of a city,Riverside Park,with the rapid development of urbanization,encounters increasingly serious heavy metal pollution problems in the soil and water,which threatens the urban ecological environment and people's health.Therefore,soil and water heavy metal research of the park has significance on urban environment and people's health.The paper monitors the content of heavy metals including As,Cu,Cr,Cd,Fe,Mn,Ni,Pb and Zn in the soil and water of 17 riverside parks in Fuzhou,and studies the spatial and temporal distribution characteristics of heavy metals in the soil and water and environmental quality status.At last,the paper evaluates the healthy risk of heavy metal in the soil and analyzes the source of heavy metals in the soil.The result indicates that:(1)The content level of heavy metal in the soil has no significant difference between two seasons,but the spatial distribution of heavy metal has great difference.The heavy metal content relation in the soil of different function areas is:commercial zone>residence zone>traffic zone>greenbelt.Cd and As in the soil are polluted seriously,and the main residual forms are As,Fe and Mn.(2)For part of riverside parks,the overall content of Cr,Fe and Pb has exceeded the centralized potable water quality standard or related limiting value of surface water environmental quality standard,and the dissolved state of each heavy metal nearly reaches Grade ? surface water quality standard;nemerow pollution index of water is 1<P nemerow<3,belonging to slight and moderate pollution level.Cr is the main pollution factor of riverside parks,belonging to heavy pollution.Fe is the second pollution factor,belonging to slightly heavy pollution.The sampling point with Mn and Pb exceeding the standard belongs to slight pollution.(3)Single factor index and nemerow index of heavy metal in the soil are smaller than 1.Cd and Zn are main pollution factors of soil.Geoaccumulation Index(Igeo)evaluation result shows that Cd appears slight pollution and the pollution degree of each heavy metal is Cd>As>Cd= Pb>Cu>Mn= Zn>Cr>Fe= Ni.(4)According to the carcinogenic risk evaluation result of heavy metal in the soil,the carcinogenic risk of heavy metal is lower than 1CRP recommended value 5×10-5 and USEPA recommended value 1×10-4.The exposure approach relation is:intake via mouth>inhaled soil particle>skin contact,with mouth intake dominant.The carcinogenic risk relation of heavy metal is CRCr>CRAs>CRPb.Hereinto,Cr accounting for 83.39%of total value at risk(TCR),is the major carcinogenic element.TCR size relationship in different function zone is commercial zone>residence zone>traffic zone>greenbelt.(5)The total value of non-carcinogenic risk of heavy metal to children and adult is larger than USEPA recommended safety threshold 1.0,and the non-carcinogenic risk of single heavy metal is smaller than 1.0.Month intake is the main exposure approach of children and the intake of soil particle is the major exposure approach of adults.Non-carcinogenic risk of heavy metal in the soil of different function zones is:commercial zone>residence zone>traffic zone>greenbelt.(6)Cr—Mn,Cr—Ni and Mn—Ni in the soil of riverside park appears significant correlation.Cr and Ni are mainly from natural source.Pb originates from traffic,industry and natural source,Zn is mainly from traffic source,and As is mainly from industrial and natural sources.