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131.
青岛近海沉积物中多环芳烃、多氯联苯和有机氯农药的含量和分布特征 总被引:19,自引:11,他引:8
利用气相色谱/质谱方法对青岛近海表层沉积物中多环芳烃(PAHs)、多氯联苯(PCBs)和有机氯农药(OCPs)进行了测定,并分析了PAHs、PCBs和OCPs的分布特征.结果表明,PAHs、PCBs和OCPs的均值分别为684.80、6.87和13.52ng·g-1,含量变化均呈近岸高、远岸低的分布规律.燃料的高温燃烧排放对本研究海域沉积物中PAHs有较大贡献;PCBs主要来源于工业及生活排放,但已受到控制;沉积物中HCHs存在工业和农业双重污染源输入,DDT主要是由于历史上使用农药造成,且在表层沉积物中受到好氧微生物降解.与国内外同类研究结果相比,调查海域沉积物中PAHs、PCBs和OCPs的污染程度及生态风险均处于较低水平. 相似文献
132.
S. Veerasingam R. Venkatachalapathy S. Sudhakar P. Raj V. Rajeswari 《环境科学学报(英文版)》2011,23(7):1129-1134
Eight mollusc species and sediment samples collected from three different stations along Tamilnadu coast, Bay of Bengal, India
were analysed for the levels of petroleum hydrocarbons to elucidate the status of the petroleum residues in mollusc meant for human
consumption. The concentrations of petroleum hydrocarbons in sediments along Tamilnadu coast varied from 5.04–25.5 g/g dw (dry
weight). High concentration of petroleum hydrocarbons in the sediment of Uppanar estuary (25.5 1.45 g/g dw) was perhaps land
and marine based anthropogenic sources of this region. The petroleum hydrocarbon residues in eight mollusc species collected from
Uppanar, Vellar and Coleroon estuaries varied between 2.44–6.04 g/g ww (wet weight). Although the concentration of petroleum
hydrocarbons in sediment of the Uppanar region was markedly higher than the background, the petroleum hydrocarbon residues in
mollusc collected from Uppanar estuary did not suggest bioaccumulation. The results signified that industrial growth has affected the
aquatic environments and regular monitoring will help to adopt stringent pollution control measures for better management of the
aquatic region. 相似文献
133.
Sedimentary record of polycyclic aromatic hydrocarbons in Lake Erhai,
Southwest China 总被引:1,自引:0,他引:1
Jianyang Guo Zhang Liang Haiqing Liao Zhi Tang Xiaoli Zhao Fengchang Wu 《环境科学学报(英文版)》2011,23(8):1308-1315
The temporal distribution of polycyclic aromatic hydrocarbons (PAHs) was investigated in a sediment core from Lake Erhal in Southwest China using gas-chromatography/mass spectrometry (GC/MS) method.The total organic carbon (TOC) normalized total PAHs concentrations (sum of US Environmental Protection Agency proposed 16 priority PAHs) ranged from 31.9 to 269 μg/g dry weight (dw),and were characterized by a slowly increasing stage in the deeper sediments and a sharp increasing stage in the upper sediments.The PAHs in the sediments were dominated by low molecular weight (LMW) PAHs,suggesting that the primary source of PAHs was low- and moderate temperature combustion processes.However,both the significant increase in high molecular weight (HMW) PAHs in the upper sediments and the vertical profile of diagnostic ratios pointed out a change in the sources of PAHs from low-temperature combustion to high-temperature combustion.The ecotoxicological assessment based on consensus-based sediment quality guidelines implied that potential adverse biological impacts were possible for benzo(ghi)perylenelene and most LMW PAHs.In addition,the total BaP equivalent quotient of seven carcinogenic polycyclic aromatic hydrocarbons (BaA,CHr,BbF,BkF,BaP,DBA and INP) was 106.1 ng/g,according to the toxic equivalency factors.Although there was no great biological impact associated with the HMW PAlls,great attention should be paid to these PAH components based on their rapid increase in the upper sediments. 相似文献
134.
Historical trends of heavy metal contamination and their sources in lacustrine sediment from Xijiu Lake, Taihu Lake Catchment, China 总被引:3,自引:1,他引:2
Concentrations of Cd, Cr, Cu, Pb, Zn and Hg in Xijiu Lake sediment from the Taihu Lake catchment, China, were analyzed. Their contamination state was investigated based on the geoaccumulation index and enrichment factors. Statistical analysis was used to differentiate the anthropogenic versus natural sources of heavy metals (HMs), and the anthropogenic accumulation fluxes were calculated to quantify anthropogenic contribution to HMs. The results indicated that the lake sediment had been heavily contaminated by Cd, enrichment of Zn and Hg was at a relatively high level, while that of Cu and Pb was in the lower-to-moderate level and Cr was in the low enrichment level. Sources of Cr in the sediment were mainly from natural inputs, while other metals, especially Cd, were predominantly derived from anthropogenic sources. In the past century, anthropogenic accumulation fluxes of Pb, Zn and Hg increased by 0.1-47.3 mg/(cm2.yr), 2.4-398.1 mg/(cm2.yr), and 3.7-110.3 ng/(m2.yr), respectively, accounting for most inputs of HMs entering the sediment. The contamination state of HMs varied with industrial development of the catchment, which demonstrated that contamination started in the early 20th century, reached the maximal level between the mid-1970s and mid-1990s, and decreased a little after the implementation of constraints on high contamination industries, although the contamination of some HMs, such as Cd, Zn and Hg, is still at high levels. 相似文献
135.
136.
污染底泥的原位钝化技术研究进展 总被引:3,自引:1,他引:2
底泥是湖泊重要的内源污染来源,关于底泥污染控制的研究近年来受到广泛重视。目前对底泥污染的控制技术主要包括原位处理技术和异位处理技术。原位处理技术主要包括钝化、覆盖、生物修复等。钝化技术是一种高效的湖泊内源污染控制技术,它通过抑制内源营养盐的释放来控制水体营养盐含量。文章综述了底泥原位钝化技术的研究及其应用情况;分析了原位钝化技术的特点及主要功能;介绍了常用底泥钝化剂的应用情况以及新型钝化剂的研究进展;并对原位钝化技术的未来发展进行了展望。 相似文献
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140.
针对钱塘江杭州段水污染现状,对钱塘江杭州段12个采样断面的沉积物进行了系统研究。结果表明,沉积物Fe、Mn的平均含量分别为2.05%,449 mg/kg,变异系数分别为16%、27%。主成分分析结果表明,Fe、Mn、K具有一定的同源性,代表沉积物的自然来源,Fe、Al的分布情况反映两者之间可能存在一定的同源性。相关性分析结果表明,Fe、Al、K均与粘粒显著或极显著相关,反映了地球化学作用和水文条件相互作用的结果;Mn与有机污染(OM)呈显著负相关,说明Mn的污染源与OM不存在同源性,相反,有机质污染导致沉积物锰含量有所降低,两者可能存在密切关系。 相似文献