寻找人类活动影响南明河的水化学指纹:Ⅱ.旬际变化
Searching for Hydrochemical Imprints Indicating Human Impacts on the Nanming River:II. Ten-Day-Scale Variations
查看参考文献15篇
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文摘
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为进一步了解南明河截污沟修建后主城区水化学组成的变化情况,提取人类活动影响南明河的水化学指纹,我们于2008年10月20日至2009年10月20日以10天为间隔或5天为间隔(7月)对南明河主城区进口(四方河)和出口(团坡桥)进行了短时间尺度取样,确证了第一部分所获得的空间变化趋势。出口处Na~+、Cl~-、NO_3~-、SO_4~(2-):一分别升高53%、65%、52%和47%;其它离子如K~+、Ca~(2+)、Mg~(2+)和HCOa只是轻微升高,pH温和下降。出口处离子浓度变化趋势继承了入口处离子浓度趋势,但叠加了城区人类活动的明显印记。Na~+浓度在6~7月间的显著峰值最有可能起源于2009年为防止禽流感爆发蔓延而广泛使用的次氯酸钠消毒剂,Na~+和Cl~-具有显著正相关关系可以证明这一推断。另外一个证据是Na~+和NO_3较好的反相关关系,说明消毒剂对氨化细菌和硝化细菌具有负面效应,抑制了NO;的产量。高硫煤的使用则是城区河段高SO_4~(2-):一含量的主要原因。结合离子浓度的均值、变化范围和标准偏差,我们认为Na~+、Cl~-、NO_3~-、SO_4~(2-)可以作为指示城区人类活动影响南明河的水化学指纹。 |
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其他语种文摘
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In this second part, our main purposes are:(1) to further ascertain ten-day-scale variations in hydrochemistry in the downtown section of the Nanming River after sewage interception;(2) to screen out hydrochemical imprints for indicating hu-man impacts on the Nanming River. Sampling sites were arranged at only two sections, e.g. site 1 (the Sifang River, as the inlet of the downtown section) and site 8 (the Tuanpo Bridge, as the outlet of the downtown section). Water samples were collected on a ten-days scale during the period from October 20,2008 to October 20,2009. From the inlet to the outlet,some ma-jor ions such as Na~+, Cl~-, NO_3,and SO_2 increased by 53%, 65%,52%, and 47%, respectively. The other ions K~+, Ca~(2+), Mg~(2+) and HCO_3~- showed slight elevations while pH displayed a mild decrease. The peak for Na~+ in June and July most possibly resulted from the widespread use of disinfectants (such as sodium hypochlorite) for the control over bird flu epidemic situation, as verified by a very good positive correlation of Na~+ with Cl~-. Another piece of evidence was the good negative relation between Na~+ and NO_3~-, demonstrating adverse effects of disinfectants on ammonifying or nitrifying bacteria responsible for the production or conversion of ammonia and ammonium to nitrite and nitrate. Dry and wet acid deposition originating from the burning of high-sulfur coal was regarded as a main reason for increases in SO_4~(2-). Those ions pertaining to urban activities, such as Na~+, C1-,NO_3~- and SO_4~(2-),can be used as hydrochemical imprints. |
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来源
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地球与环境
,2012,40(4):524-528 【核心库】
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关键词
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城市化
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水化学
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截污沟
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南明河
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地址
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中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵阳, 550002
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语种
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中文 |
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ISSN
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1672-9250 |
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学科
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环境科学基础理论 |
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基金
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贵州省自然科学基金
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国家水体污染控制与治理科技重大专项
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文献收藏号
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CSCD:4728793
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参考文献 共
15
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