Dissolved Trace Metal–Organic Complexes in the Lot–Garonne River System Determined Using the C18 Sep-Pak System     

E. Lemaire  G. Blanc  J. Schäfer  A. Coynel  H. Etcheber 《Aquatic Geochemistry》2006,12(1):21-38

An 11-month observation of dissolved and particulate organic matter, chlorophyll a(Chl a), C18 Sep-Pak extractable hydrophobic dissolved organic matter (hDOM) fraction and associated dissolved trace metals (Cd, Cu, V, Co, Ni, Mo, U) was performed in the Lot–Garonne River system. This system includes the Riou Mort, the Lot River and the downstream reaches of the Garonne River and represents the fluvial transport path of trace metals between the major point source of polymetallic pollution, located in the Riou Mort watershed and the Gironde estuary. Spatial and temporal variations of dissolved and particulate organic carbon and Chl areflect the presence of different types of organic matter and their relation with the hDOM fraction. Maximum Chl a/POC ratios (up to 0.03), indicate intense phytoplankton production from March to May. In the Lot River (Temple), DOC and POC concentrations were clearly higher and mean Chl a concentration (2.8 mg g⁻¹) was about three times higher than those of the other sites. High Chl a/POC ratios suggest high phytoplankton activity with maxima in spring and late summer. In the Riou Mort River, very high POC concentrations of up to 40 (mean: 20) occurred, whereas Chl a concentrations were relatively low indicating low phytoplankton activity. High, strongly variable DOC and POC concentrations suggest important natural (Carboniferous soils, forests) or anthropogenic (e.g., former coal mines, waste areas, agriculture, sewage) carbon sources within the small Riou Mort watershed. Despite high DOC concentrations in the Riou Mort River, hDOM metal fractions were generally lower than those at the other sites. The general order of decreasing binding strength between metals and the organic hydrophobic phase (Cu, U > Co, Ni > V, Mo > Cd) at all four sites was in good agreement with the Irving–William series of transition element affinity towards organic ligands. Accordingly, the role of the hydrophobic phase in dissolved Cd transport appeared to be negligible, whereas the hDOM–Cu fraction strongly contributed to dissolved Cu transport.  相似文献   

中国中新生代咸化湖盆烃源岩沉积的问题及相关进展   总被引：8，自引：0，他引：8  

金强  朱光有 《高校地质学报》2006,12(4):483-492

我国东部断陷湖盆和西部坳陷湖盆第三系均有蒸发岩与烃源岩共生现象。前者水体深、咸化范围小，在氯化盐和碳酸盐沉积环境中形成了优质烃源岩，后者水体浅、咸化范围大，在氯化盐和硫酸盐沉积环境中发育了优质烃源岩，作者认为两种湖盆出现的水体分层是有机质堆积和保存的重要条件。济阳坳陷和柴达木盆地为两类咸化湖盆的典型代表，对它们的研究可以深化蒸发岩-烃源岩共生区油气地质的认识、促进勘探发展。  相似文献   

Vertical variation of phosphorus forms in surface sediments from Wuli Bay, Taihu Lake, China   总被引：1，自引：0，他引：1  

李军  刘丛强  王仕禄  朱兆洲  周志华  肖化云 《中国地球化学学报》2006,25(3):279-284

1IntroductionPhosphorus,an essential nutrient for the primaryproductivity in freshwater systems,is an important fac-tor controlling lacustrine eutrophication.Although ex-ternal input of phosphorus has been assumed as the vi-tal responsibility for the eutrophication of lakes(ZhuJun et al.,2005),the remobilization of phosphorus insediments has a distinct influence on it as well(Bostr m et al.,1982).The concentrations of totalphosphorus(Ptotal)in the sediments are often related tothe trophic st…  相似文献   

旧供水井化学处理方法介绍--以加德满都市旧供水井修复为例   总被引：1，自引：0，他引：1  

章伟民 《水文地质工程地质》2005,32(6):100-101,107

本文以加德满都市旧供水井修复项目为例,针对因滤水管缝隙被化学物质堵塞,导致井出水量逐年减少的旧供水井。通过井下电视摄像系统检查,采用六偏磷酸钠、氨基黄酸等有机酸,结合刷洗、高压喷射等机械方法进行处理,使旧供水井出水量得到明显提高。  相似文献   

永定河沉积物中磷的存在形态及其指示意义   总被引：11，自引：3，他引：11  

陈红军  黄怀曾冯流 陈明 《岩矿测试》2005,24(3):176-180

采集官厅水库的永定河入库口附近沉积物,采集深度77cm,以1cm做为一个层位单元进行分割,测定其中11个层位的总磷,同时对这些层位沉积物中二钙结合态磷、八钙结合态磷、铝结合态磷、铁结合态磷进行连续分级提取,有机磷通过灼烧法测定,残留态磷由总磷与上述五种形态磷差减确定。结果显示:沉积物中总磷含量在580.3~1276.2μg/g,主要成分为无机磷,平均占总磷的比例为88%;残留态磷为沉积物中磷的主要形态,含量占总磷50%以上。在沉积物深度75~20cm的沉积年份中,永定河向官厅水库输送的残留态磷量不断增加,且增速逐渐加快,主要为水土侵蚀的产物。从沉积深度20cm以来的沉积年份里,总磷的输入量不断减少,但以二钙结合态磷为主的生物有效磷输入量随总磷的含量降低而持续增加,主要来自工业和生活污水,反映了官厅水库上游永定河流域内工业和生活污水排放所占的比重日益增加,成为官厅水库富营养化污染的主要来源,以致官厅水库富营养化的趋势增强。  相似文献   

超声与振荡提取沉积物中松散结合态磷的比较     

罗俊凌罗爱芹  张月琴 《岩矿测试》2005,24(3):193-196

用超声技术提取沉积物样品中松散结合态磷,并与振荡提取结果进行比较。结果表明,超声提取结果与振荡提取结果大致相当。超声提取耗时短,操作简单易行,测试结果精密度为3.8%(RSD,n=7),可以替代振荡方法提取沉积物中的松散结合态磷。  相似文献   

磷灰石结晶法降低天然水体中磷浓度Ⅰ.不同反应物对降磷效果的影响     

胡明月  黄怀曾 《岩矿测试》2005,24(4):249-253

利用矿物磷灰石低溶度积特征,以晶体磷灰石作晶胞,引入氟、钙等离子,诱使水中溶解性磷酸盐在磷灰石晶体上沉淀、结晶,使水溶液中磷浓度明显降低。探讨了钙、磷灰石、氟、氯的加入对降磷效果的影响,初步分析了生成产物的结构。实验溶液中磷初始浓度约为5 mg/L,经磷灰石结晶后,最低可降至10μg/L以下,除磷效率可达99%以上。  相似文献   

马朗凹陷马1井储层长石中有机包裹体研究          下载免费PDF全文

张小青  伊海生  危国亮  张小芹 《沉积与特提斯地质》2005,25(4):83-86

根据对马朗凹陷马1井储层长石中有机包裹体的基本特征、均一温度、荧光及荧光光谱分析，得出有机包裹体均一温度为60～90℃．120～140℃，其对应的荧光颜色分别为黄色和蓝绿色。认为储层的油气运移经历了两期，第一期为烃类的主要运移、聚集期，油气为低成熟油；第二期为少量的烃类聚集，并判断出二叠系条湖组该段储层为油气产层。  相似文献   

Soluble organic compounds in fog and cloud droplets: what have we learned over the past few years?     

Sandro Fuzzi  Maria Cristina Facchini  Stefano Decesari  Emanuela Matta  Mihaiela Mircea 《Atmospheric Research》2002,64(1-4)

We have recently set up a new procedure for characterising the water soluble organic compounds (WSOC) in fog water, for which information is still rather limited. Fog samples collected during the 1998–1999 fall–winter season in the Po Valley (Italy) were analysed following this procedure, which allows a quantitative determination of three main classes of organic compounds (neutral species, mono- and di-carboxylic acids, polycarboxylic acids), together accounting for ca. 85% of the total WSOC. This procedure also provides information on the main chemical characteristics of these three classes of compounds (functional groups, aliphatic vs. aromatic character, etc.). The enhanced chemical knowledge on fog/cloud chemical composition opens new scenarios as far as chemical and microphysical processes in clouds and fogs are concerned.  相似文献   

平落坝储层有机包裹体特征与气藏形成过程研究   总被引：4，自引：0，他引：4  

高岗  黄志龙 《沉积学报》2002,20(1):156-159

通过储集层成岩作用与有机包裹体的研究认为,研究区储集层有机包裹体主要通过交代和重结晶作用而形成,有各种相态形式,主要分布在石英颗粒内溶蚀缝或孔隙中,构造裂缝中基本未见有机包裹体。上三叠统储集层包裹体丰度明显高于侏罗系沙溪庙组。香二气藏砂岩有机包裹体均一温度主峰在 10 0～ 110℃;沙溪庙气藏砂岩有机包裹体均一温度主峰在 90～ 10 0℃。香二气藏形成时间早,经历了印支期少量注入到印支期末-喜山早期大量注入,再到喜山晚期调整、部分注入的过程。沙溪庙气藏天然气注入则主要发生于喜山运动期。  相似文献