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曼谷湾河口区百年来沉积物重金属变化趋势及污染来源
引用本文:郭瑜璇, 乔淑卿, 石学法, 吴斌, 袁龙, 任艺君, 高晶晶, 朱爱美, NarumolKornkanitnan. 曼谷湾河口区百年来沉积物重金属变化趋势及污染来源[J]. 海洋地质与第四纪地质, 2019, 39(2): 61-69. doi: 10.16562/j.cnki.0256-1492.2018031901
作者姓名:郭瑜璇  乔淑卿  石学法  吴斌  袁龙  任艺君  高晶晶  朱爱美  Narumol Kornkanitnan
作者单位:1.自然资源部第一海洋研究所, 青岛 266061;; 2.海洋科学与技术国家实验室 海洋地质过程与环境功能实验室, 青岛 266237;; 3.海洋与海岸资源研究中心, 曼谷 74000
基金项目:亚洲大陆边缘源-汇过程与陆海相互作用;国家自然科学基金;不同能源结构下有机物污染物海洋沉积记录的对比;山东省泰山学者工程计划
摘    要:2015年7月在泰国曼谷湾邦巴功河河口采集了1根1.5m长的沉积物柱样,分析了样品中重金属元素(Cd、Pb、Co、Ni、Cu、Cr、Zn)含量,进行了粒度和210Pb、137Cs活度测试,使用地累积指数、元素污染指数和潜在生态风险参数对重金属污染情况进行评级, 并结合实际情况对污染来源进行了推断。结果表明:沉积柱状样210Pb、137Cs活度测试结果计算获得的沉积速率约为2.3cm/a,沉积物柱状样记录了1948—2015年的沉积情况。7种重金属元素含量均值分别为0.11、29.60、19.78、44.18、28.99、80.93、99.01 mg/kg。重金属含量较20世纪都有所增长,Cd、Zn、Pb、Cr在整段沉积时间框架内增长明显。元素富集程度顺序为Cd>Zn>Pb>Cr>Cu>Ni>Co, Cd元素污染程度最为严重,Pb、Cu和Zn为偏中度污染,Cr、Ni和Co为轻度污染。单一重金属生态风险系数Eri评级顺序为Cd>Pb>Cu>Ni>Co>Cr>Zn。其中Cd为很强至极强生态危害,Pb为轻微至中等生态危害。Cd、Zn、Cu和Pb元素没有超出泰国沉积物环境质量基准规定的效应区间低值,Ni超出效应区间低值,但没有超过效应区间中值。重金属元素与Al较差的相关性表明重金属元素主要是非自然来源,Cd、Cu、Zn可能源于金属冶炼和交通,此外, Cd还可能存在其他未知工业污染来源,受人类活动影响较大。Cr可能源于纺织业发展。1990年之后较1990年之前重金属元素之间的相关性更差,指示1990年之后相比1990年之前重金属污染来源更复杂。

关 键 词:沉积物   重金属   粒度   曼谷湾
收稿时间:2018-03-19
修稿时间:2018-05-04

Variation trend and contamination source of heavy metals in sediments from estuary area of Bangkok Bay in the past century
GUO Yuxuan, QIAO Shuqing, SHI Xuefa, WU Bin, YUAN Long, REN Yijun, GAO Jingjing, ZHU Aimei, . Variation trend and contamination source of heavy metals in sediments from estuary area of Bangkok Bay in the past century[J]. Marine Geology & Quaternary Geology, 2019, 39(2): 61-69. doi: 10.16562/j.cnki.0256-1492.2018031901
Authors:GUO Yuxuan  QIAO Shuqing  SHI Xuefa  WU Bin  YUAN Long  REN Yijun  GAO Jingjing  ZHU Aimei
Affiliation:1.The First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China;; 2.Laboratory for Marine Geology and Environment, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China;; 3.Department of Marine and Coastal Resources, Marine and Coastal Resources Research Center, Bangkok 74000, Thailand
Abstract:A 1.5-meter long sediment core was collected from the estuary of Bang Pakong River, Bangkok Bay, in July 2015. Calculated with 210Pb and 137Cs, the sedimentation rate is 2.3cm/a. It means that the sediment has been deposited in the year from 1948 to 2015. Heavy metal element (Cd, Pb, Co, Ni, Cu, Cr and Zn) concentrations, measured by ICP-MS, are 0.11, 29.60, 19.78, 44.18, 28.99, 80.93 and 99.01 mg/kg, respectively. Amounts of Cd, Zn, Pb and Cr increased significantly during the period. The degree of heavy metal pollution ranks in an order of Cd>Zn>Pb>Cr>Cu>Ni>Co. Calculated geo-accumulation indices demonstrate that the sediment are moderately polluted by Cd, and slightly by Pb, Co, Ni, Cu, Cr and Zn. The potential ecological risk indexes of single element(Eri) are ranked in an order of Cd > Pb > Cu > Ni > Co > Cr > Zn. Ecological risk evaluation of heavy metals suggests that Cd is high to very high in ecological risk, while Pb is low to moderate. The concentrations of Cd, Zn, Cu and Pb in the sediments are lower than the effects range low(ERL), and the concentrations of Ni have exceeded the effects range low(ERL), but below the effects range median(ERM). Cd, Cu and Zn may derive from metallurgical industry and transportation. Cd has an unknown source of pollution, strongly influenced by human activities. The anomaly high Cr may be from textile industry. Inter-elemental correlation of heavy metals before the year of 1990 was worse than that after 1990, indicating that there may be more complex sources of heavy metal pollution after the year of 1990.
Keywords:sediment  heavy metals  grain size  Bangkok Bay
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