广东柘林湾至大埕湾海域表层沉积物重金属分布与环境地球化学特征  

Distribution and Environmental Geochemistry Characteristics of Heavy Metals in Surface Sediment from Zhelin Bay to Dacheng Bay,Guangdong Province,China

作　　者：袁国明[1] 何桂芳[1] 

机构地区：[1]国家海洋局南海环境监测中心,广州510300

出　　处：《地球与环境》2015年第2期190-197,共8页Earth and Environment

基　　金：海洋公益性科研专项(20110515)

摘　　要：对广东柘林湾至大埕湾海域35个站点的表层沉积物样品进行了重金属和粒度分析,重金属Hg、As、Cu、Pb、Cd、Zn和Cr的平均含量（mg/kg）分别为：0.053、9.7、19.2、40.0、0.11、89.0和31.4。重金属（Cd除外）平面分布多呈西高东低、由柘林湾向大埕湾递减的变化趋势。本区粒度主要以细粒的粉砂（T）和粘土质粉砂（YT）为主,只有在湾口旗头山岬角附近以及黄冈河口附近粒度较粗,为砂质（S）过度至砂质粉砂（ST）,显示出滨、浅海沉积环境。通过一些环境地球化学参数计算显示,重金属富集系数在0.73~1.37之间,其中Hg、Cu、Pb、Zn属弱富集,As、Cr和Cd与当地背景值相当。单因子潜在生态风险评价Hg属于中度污染,其余重金属为低度污染。多因子总生态风险评价广大区域属于低风险,中风险仅呈零星小斑块状分布,证明本区域沉积物环境总体良好。重金属之间（Cd除外）相关性为极显著~显著,显示出相似的来源。重金属与粒度相关性为显著~弱显著,重金属大致符合粒度控制规律。By collecting 35 surficial sediment samples from Zhelin Bay to Dacheng bay,Guangdong Province,China,heavy metals and the grain-size were analyzed.Results show that the mean contents of Hg,As,Cu,Pb,Cd,Zn and Cr are respectively0.053mg/kg,9.7mg/kg,19.2mg/kg,40.0mg/kg,0.11mg/kg,89.0mg/kg and 31.4mg/kg,and their distribution pattern shows a decrease from zhelin Bay to Dacheng Bay and from the west to the east（except Cd）.The fine grain-size such as silt and clay dominate the vast area,and sand only exists in the local area,indicating the sedimentary environment of coastal and shallow sea.Based on the distribution of heavy metals,some environmental geochemistry characteristics of heavy metals were quantitatively assessed.The enrichment facto of heavy metals varies from 0.73 to 1.37,with the minor artificial enrichment in the Hg,Cu,Pb and Zn,while As,Cr and Cd is close to their background.The potential ecological risk index of sediment display generally good environment：single-factor index of the Hg has reached the grade of moderate-risk and the others only belong to the grade of low-risk,forthermore,mulit-factor integrated index is mostly in the low-risk,with moderate-risk existing sporadically.The heavy metals show outstanding positive correlation with each other（except Cd）and might have similar sources.There are positive certain correlation between heavy metals and grain-size,broadly in accordance with granularity control of heavy metals in sediment.

关 键 词：沉积物 重金属 含量与分布 富集 潜在生态风险 

分 类 号：P736.41[天文地球—海洋地质] X142[天文地球—海洋科学]