【摘要】：基于2014年4月廟島群島南部海域的調(diào)查資料,綜合運用單因子指數(shù)法、地質(zhì)累積指數(shù)法和潛在生態(tài)風險指數(shù)法3種方法,研究了海水和表層沉積物重金屬元素的含量分布特征,并對重金屬元素進行了污染評價和生態(tài)風險分析。結(jié)果表明:調(diào)查海域海水中Zn、Hg、Cu和Cd均符合第一類或第二類海水水質(zhì)標準,15%站位的Pb超第二類海水水質(zhì)標準;表層沉積物中7種重金屬均符合第一類沉積物質(zhì)量標準,沉積物質(zhì)量良好;地質(zhì)累積指數(shù)評價結(jié)果表明沉積物中重金屬污染程度由高到低為ZnAsPbCrCuCdHg,Hg均處于清潔狀態(tài),As、Pb、Cr、Cu、Cd均有部分站位呈輕度污染狀態(tài);潛在生態(tài)風險指數(shù)表明沉積物中重金屬綜合潛在生態(tài)風險程度為中,7種重金屬潛在生態(tài)風險由高到低為CdHgAsPbCuZnCr,Cd和Hg為調(diào)查海域沉積物重金屬主要潛在生態(tài)風險因子;Pearson相關(guān)分析結(jié)果表明Zn、Cr、Hg、Cu、Pb、As之間呈顯著相關(guān)(P0.01),具有相似的來源特征。廟島群島南部海域重金屬的來源主要包括黃河入海泥沙懸浮物輸送、周邊沿岸入海徑流輸入、港口碼頭船舶引入和大氣沉降輸入等。應(yīng)加強對廟島群島南部海域海水中Pb及表層沉積物中Cd和Hg的監(jiān)測,重點關(guān)注沉積物中Cd和Hg相對高值區(qū)的潛在生態(tài)風險。
[Abstract]:Based on the investigation data in the southern waters of Miaodao Islands in April 2014, the contents and distribution characteristics of heavy metals in seawater and surface sediments were studied by using single factor index method, geological accumulation index method and potential ecological risk index method. Zn, Hg, Cu and CD in the investigated seawater all conform to the first or second class seawater quality standards, 15% of the stations meet the second class seawater quality standards; 7 heavy metals in the surface sediments all conform to the first class sediment quality standards, and the quality of the sediments is good; the evaluation results of geological accumulation index show that the pollution degree of heavy metals in the sediments is from high to high. As, Pb, Cr, Cu and Cd were slightly polluted. The potential ecological risk index showed that the comprehensive potential ecological risk of heavy metals in sediments was moderate, and the potential ecological risk of seven heavy metals was CdHgAsPbCuZnCr from high to low, and Cd and Hg were the main potential heavy metals in the sediments of the investigated sea area. The results of Pearson correlation analysis showed that Zn, Cr, Hg, Cu, Pb and As were significantly correlated with each other (P 0.01) and had similar source characteristics. To strengthen the monitoring of Cd and Hg in seawater and surface sediments in the southern waters of Miaodao Islands, the potential ecological risks in the relatively high values of Cd and Hg in sediments should be paid more attention.
【作者單位】： 山東省海洋資源與環(huán)境研究院山東省海洋生態(tài)修復(fù)重點實驗室;中國海洋大學環(huán)境科學與工程學院;
【基金】：國家海洋公益性行業(yè)專項經(jīng)費項目(201105006;201205001) 山東省軟科學研究計劃項目(2014RKB12003)資助
【分類號】：X826;X55

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