摘要
选择北部湾中人为活动较为频繁的钦州湾作为研究区域,对表层沉积物中的7种重金属采用多种方法进行研究。结果表明:As和Hg含量较其他相似区域偏高,Pb和Cd含量相当,Cr、Cu和Zn含量低。含量近年来有所提升,高值点均靠近一些工业排污、人类活动区域。随机地累积模型评价结果表明Cd为"无-中污染",34%的可能性恶化为"中污染";其他重金属为"无污染",As和Hg分别有48%、24%的概率恶化。潜在生态风险排序为Cd>Hg>As>Pb>Cu>Zn≈Cr;形态分析发现Hg主要以稳定的残渣态存在,暗示在沉积物与海水间的迁移性弱,可利用性低;主成分分析的结果揭示了Cd主要源于港口航运及港口疏浚活动,其他重金属主要来自工业(制糖、燃煤、石油化工等)和陆源市政污水,钦州湾重金属含量主要受工业和人为活动的影响。
Qinzhou Gulf was selected as the research area because of frequently human activities. Seven heavy metals in surface sediments were studied by various methods. The results showed that the contents of As and Hg were higher than those in other similar areas, the contents of Pb and Cr were equal, and the contents of Cr, Cu and Zn were lower. In recent years, the content heavy metal contents increased, and the high value points were all close to some industrial sewage emission and human activity areas. The evaluation results of random accumulation model showed that Cd was in no pollution to medium pollution level, and 34% of them had probability to deteriorate to medium pollution level;other heavy metals were in no pollution level, and 48% of As and 24% of Hg had the probability of deterioration. The order of potential ecological risk was Cd>Hg>As>Pb>Cu>Zn≈Cr;speciation analysis showed that Hg mainly existed in the form of stable residue, suggesting that the migration between sediment and seawater was weak and the availability of Hg was low;the results of principal component analysis showed that Cd mainly came from port shipping and dredging activities, and other heavy metals mainly came from industry(sugar, coal, petrochemical, etc.) and land-based municipal sewage. The heavy metal content in Qinzhou Bay was mainly affected by industry and human activities.
作者
朱学韬
林海英
冯庆革
赵博涵
朱奕帆
蓝文陆
李天深
ZHU Xue-tao;LIN Hai-ying;FENG Qing-ge;ZHAO Bo-han;ZHU Yi-fan;LAN Wen-lu;LI Tian-shen(School of Resources,Environment and Materials,Guangxi University,Nanning 530004,China;Guangxi University Key Laboratory of Environmental Protection,Guangxi University,Nanning 530004,China;Marine Environment Monitoring Center of Guangxi,Beihai 536000,China)
出处
《环境工程》
CAS
CSCD
北大核心
2021年第8期69-76,共8页
Environmental Engineering
基金
广西自然科学基金项目(2020GXNSFAA297011,2020JJA120036,2016GXNSFBA380238)
广西重点研发计划(桂科AB18126075)
广西科技重大专项(桂科AA17204066,桂科AA17129001)。
