花溪水库表层沉积物重金属污染及潜在生态风险评价

摘要

The highest values for heavy metal concentrations in sediments before the modern industrialization of the world and thernpotential ecological risk of heavy meials were analyzed and assessed by using the method of potential ecological risk indicesrnpresented. The results shows that: The accumulating order for these heavy metals was Cu > Zn > Cd > Pb > Cr > As > Hg, and thernorder of pollution level was Hg > Cd > Cu > As > Pb > Cr > Zn; The contamination factor ( E ) illustrate that most surfacernsediments are light; The contamination level of surface sediments in Huaxi reservoir are light.%以现代工业化前正常颗粒沉积物中重金属含量的最高背景值为参比值,结合潜在生态风险指数法对花溪沉积物中重金属的生态危害进行了评价.结果表明,花溪水库沉积物中重金属的富集顺序为Cu＞Zn＞Pb＞Cr＞As＞Cd＞Hg,污染水平顺序为Hg＞Cd＞Cu＞As＞Pb＞Cr＞Zn；重金属的潜在生态风险系数(Eir)表明,除个别样点外,大多属于轻微生态危害范畴；多种重金属的生态系统的潜在生态风险指数(IR)表明,花溪水库沉积物重金属污染属于轻微生态危害.