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黄向青,林进清,梁开,陈太浩,甘华阳,潘毅.广西近岸海域水下平原表层沉积物中重金属分布及其积累[J].广西科学院学报,2014,30(2):120-126. [点击复制]
- HUANG Xiang-qing,LIN Jin-qing,LIANG Kai,CHEN Tai-hao,GAN Hua-yang,PAN Yi.The Distribution and Accumulation of Heavy Metals in Surficial Sediment in Submarine Plain of Guangxi Nearshore Waters[J].Journal of Guangxi Academy of Sciences,2014,30(2):120-126. [点击复制]
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| 广西近岸海域水下平原表层沉积物中重金属分布及其积累 |
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黄向青, 林进清, 梁开, 陈太浩, 甘华阳, 潘毅
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| (国土资源部广州海洋地质调查局, 国土资源部海底矿产资源重点实验室, 广东广州 510760) |
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| 摘要: |
| [目的]研究广西近岸水下平原沉积物重金属分布和积累特征,促进对重金属自河口海湾向陆架扩散规律的对比与把握。[方法]从广西近岸水下平原采集表层沉积物和岩芯,通过实验测试的手段,分析表层沉积物重金属Pb、As、Hg的分布和积累特征。[结果]广西近岸水下平原表层沉积物中Pb含量为8.0×10-6~44.7×10-6,As含量为1.6×10-6~31.4×10-6,Hg含量为0.001×10-6~0.086×10-6,变化较大;Pb、As、Hg的分布受沉积环境和沉积物类型影响,As含量在水下平原北部水动力作用强烈之处出现局部高值,与含As的母岩风化有关;Pb、As、Hg有一定的共聚性,并显示亲Ni、Zn、Ga、Zr和疏Sr的特征;Pb、As、Hg与粒度参数有线性和聚类关系,对粒级响应性即斜率k的拐点在~0.125mm至~0.063mm之间,视沉积环境和沉积物的不同而有所移动;贫有机质站位由于水动力作用强烈,以自然风化的物理过程为主,重金属含量很低,而有机质积累成因为主的站位重金属含量积累增幅区间的频率,Pb的以40%~60%最高,As和Hg的均是60%~80%最高,增幅序列均遵循单增自然对数关系,曲线分段对应不同的沉积环境。[结论]广西近岸水下平原表层沉积物质量总体较好,但相对区域本底值来看,Pb积累性比较突出,As次之。 |
| 关键词: 水下平原 沉积物 重金属 分布 积累 |
| DOI： |
| 投稿时间：2013-08-03修订日期：2013-10-14 |
| 基金项目:中国地质调查局"我国重点海岸带滨海环境地质调查与评价"项目(编号1212010611403)资助。 |
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| The Distribution and Accumulation of Heavy Metals in Surficial Sediment in Submarine Plain of Guangxi Nearshore Waters |
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HUANG Xiang-qing, LIN Jin-qing, LIANG Kai, CHEN Tai-hao, GAN Hua-yang, PAN Yi
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| (Guangzhou Marine Geological Survey, Key Laboratory of Marine Mineral Resources, Ministry of Land and Resources, Guangzhou, Guangdong, 510760, China) |
| Abstract: |
| [Objective] The distribution and accumulation of heavy metals in sediments of near-shore submarine plain along Guangxi coast was studied in order to understand heavy metal transport from estuaries and bays to shallow shelf.[Methods] Based on surficial sediment and core samples from nearshore submarine plain of Guangxi,laboratory test data analyzed mainly with statistical method showed the distribution and accumulation of heavy metals Pb, As, Hg in sediment. [Results] The results showed that main sediment types are sand and clay sand. Pb is 8.0×10-6~44.7×10-6;As is 1.6×10-6~31.4×10-6;and Hg is 0.001×10-6~0.086×10-6.The concentration of heavy metal is affected by environments and types of sedimentary. The high concentration of As in the area with strong hydrodynamic force of submarine plain northern part might be due to the airslaking of mother rock. Pb, As and Hg often show co-occurrence, are correlation with Ni, Zn, Ga, Zr etc. and are poor or negative correlation with Sr. There are linear and cluster relationship between heavy metals and grain parameters, and the transition grain sizes is from~0.125mm to~0.063mm using LST method. Stations of poor organic matters showed low heavy metals and thus the heavy metals percentage of organic matter accumulation station varied from 40% to 80%. [Conclusion] Although the sediment quality of Pb,As and Hg is still in the range of national marine sediment standards. However, the accumulation is still significant especially Pb compared with their background values. |
| Key words: nearshore submarine plain sediment heavy metal distribution accumulation |
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