本文主要研究内容
作者赵德文（2019）在《巢湖表层沉积物汞污染风险评估及磁学诊断》一文中研究指出：湖泊是重要的自然资源,在蓄水、灌溉、旅游业、渔业及航运等方面发挥着重要作用,还具有提供饮用水水源及改善区域生态环境等多种功能。而湖泊沉积物是一种环境信息载体,记录区域及局部地区的环境信息。本文以巢湖表层沉积物为研究对象,根据巢湖水文周期和空间分布特征,进行均匀布点采样;对表层沉积物的理化性质、磁学参数(磁化率χ、非磁滞剩磁ARM、饱和等温剩磁SIRM、硬剩磁HIRM及S-ratio等)和重金属汞污染的时空分布特征进行分析研究,并判断出磁性矿物和汞的主要来源。最后,采用三种风险评价法(地累积指数法、潜在生态风险指数法和沉积物质量基准法)对表层沉积物重金属汞污染进行生态风险评价。通过以上研究得出主要结论如下:(1)巢湖表层沉积物pH平均值呈弱碱性,沉积物氧化还原电位(Eh)处于还原态,Eh值和pH整体上的变化趋势是一致的。除了部分点高值外,沉积物电导率(EC)值总体符合天然水体电导率的范围。死亡藻类的长期沉降累积是巢湖沉积物中有机质的主要来源。(2)巢湖表层沉积物重金属汞浓度范围为0.024-0.278 mg/kg,平均值为0.096 mg/kg,最大值出现在南淝河口,最小值在中湖心,空间分布上呈现西巢湖高于东巢湖,南淝河附近的汞浓度较大,可能与上游合肥市的人为排放大量污染物有关。在时间上,汞的浓度平均值12月份最低(0.08 mg/kg),9月份最高(0.114 mg/kg),有逐渐变大的趋势,汞浓度高于同类型的半封闭浅水湖泊。沉积物的理化性质对沉积物重金属有一定影响,相关性分析结果表明汞浓度与电导率和有机质有较高的相关性,与粒度呈负相关,说明电导率和有机质对沉积物物重金属汞浓度有一定影响。地累积指数和沉积物质量准则法表明汞污染风险较低,潜在生态风险结果则表明汞污染风险为中度风险,其中西巢湖风险较高,南淝河口风险最大(=229)。生态风险评价结果高于前人的沉积物汞污染生态风险评价结果,表明巢湖表层沉积物汞生态风险有升高的趋势。(3)巢湖表层沉积物主要组分为粉砂,其中细粉砂和中粉砂在湖内分布范围最广,而近岸区域小范围砂含量变化范围较大。沉积物平均粒径变化范围Mz在3.27~6.64Φ,平均值为5.62Φ,粒度具有由岸向湖区内部随距离增加而逐渐变细的趋势,但在部分近岸区域,雨水汇集入湖导致粒度参数变化剧烈。巢湖的表层沉积物频率曲线表现为1个明显的组分峰值,峰值对应粒径是20μm,表明巢湖沉积物来源比较单一,可能是受近距离搬运的粗颗粒的影响较大。研究区域的土壤磁化率(χ)平均值为66.89×10~-88 m~3/kg,高于背景值,说明研究区域表层沉积物中存在较强的人为来源的磁性矿物的富集。SOFT与SIRM呈极显著正相关,说明MD和PSD晶粒的亚铁磁性物质是研究区域土壤磁性的主要贡献者。论文研究内容和结果可为巢湖表层沉积物汞污染监测及治理提供参考依据。图34表14参147
Abstract
hu bo shi chong yao de zi ran zi yuan ,zai xu shui 、guan gai 、lv you ye 、yu ye ji hang yun deng fang mian fa hui zhao chong yao zuo yong ,hai ju you di gong yin yong shui shui yuan ji gai shan ou yu sheng tai huan jing deng duo chong gong neng 。er hu bo chen ji wu shi yi chong huan jing xin xi zai ti ,ji lu ou yu ji ju bu de ou de huan jing xin xi 。ben wen yi chao hu biao ceng chen ji wu wei yan jiu dui xiang ,gen ju chao hu shui wen zhou ji he kong jian fen bu te zheng ,jin hang jun yun bu dian cai yang ;dui biao ceng chen ji wu de li hua xing zhi 、ci xue can shu (ci hua lv χ、fei ci zhi sheng ci ARM、bao he deng wen sheng ci SIRM、ying sheng ci HIRMji S-ratiodeng )he chong jin shu gong wu ran de shi kong fen bu te zheng jin hang fen xi yan jiu ,bing pan duan chu ci xing kuang wu he gong de zhu yao lai yuan 。zui hou ,cai yong san chong feng xian ping jia fa (de lei ji zhi shu fa 、qian zai sheng tai feng xian zhi shu fa he chen ji wu zhi liang ji zhun fa )dui biao ceng chen ji wu chong jin shu gong wu ran jin hang sheng tai feng xian ping jia 。tong guo yi shang yan jiu de chu zhu yao jie lun ru xia :(1)chao hu biao ceng chen ji wu pHping jun zhi cheng ruo jian xing ,chen ji wu yang hua hai yuan dian wei (Eh)chu yu hai yuan tai ,Ehzhi he pHzheng ti shang de bian hua qu shi shi yi zhi de 。chu le bu fen dian gao zhi wai ,chen ji wu dian dao lv (EC)zhi zong ti fu ge tian ran shui ti dian dao lv de fan wei 。si wang zao lei de chang ji chen jiang lei ji shi chao hu chen ji wu zhong you ji zhi de zhu yao lai yuan 。(2)chao hu biao ceng chen ji wu chong jin shu gong nong du fan wei wei 0.024-0.278 mg/kg,ping jun zhi wei 0.096 mg/kg,zui da zhi chu xian zai na fei he kou ,zui xiao zhi zai zhong hu xin ,kong jian fen bu shang cheng xian xi chao hu gao yu dong chao hu ,na fei he fu jin de gong nong du jiao da ,ke neng yu shang you ge fei shi de ren wei pai fang da liang wu ran wu you guan 。zai shi jian shang ,gong de nong du ping jun zhi 12yue fen zui di (0.08 mg/kg),9yue fen zui gao (0.114 mg/kg),you zhu jian bian da de qu shi ,gong nong du gao yu tong lei xing de ban feng bi jian shui hu bo 。chen ji wu de li hua xing zhi dui chen ji wu chong jin shu you yi ding ying xiang ,xiang guan xing fen xi jie guo biao ming gong nong du yu dian dao lv he you ji zhi you jiao gao de xiang guan xing ,yu li du cheng fu xiang guan ,shui ming dian dao lv he you ji zhi dui chen ji wu wu chong jin shu gong nong du you yi ding ying xiang 。de lei ji zhi shu he chen ji wu zhi liang zhun ze fa biao ming gong wu ran feng xian jiao di ,qian zai sheng tai feng xian jie guo ze biao ming gong wu ran feng xian wei zhong du feng xian ,ji zhong xi chao hu feng xian jiao gao ,na fei he kou feng xian zui da (=229)。sheng tai feng xian ping jia jie guo gao yu qian ren de chen ji wu gong wu ran sheng tai feng xian ping jia jie guo ,biao ming chao hu biao ceng chen ji wu gong sheng tai feng xian you sheng gao de qu shi 。(3)chao hu biao ceng chen ji wu zhu yao zu fen wei fen sha ,ji zhong xi fen sha he zhong fen sha zai hu nei fen bu fan wei zui an ,er jin an ou yu xiao fan wei sha han liang bian hua fan wei jiao da 。chen ji wu ping jun li jing bian hua fan wei Mzzai 3.27~6.64Φ,ping jun zhi wei 5.62Φ,li du ju you you an xiang hu ou nei bu sui ju li zeng jia er zhu jian bian xi de qu shi ,dan zai bu fen jin an ou yu ,yu shui hui ji ru hu dao zhi li du can shu bian hua ju lie 。chao hu de biao ceng chen ji wu pin lv qu xian biao xian wei 1ge ming xian de zu fen feng zhi ,feng zhi dui ying li jing shi 20μm,biao ming chao hu chen ji wu lai yuan bi jiao chan yi ,ke neng shi shou jin ju li ban yun de cu ke li de ying xiang jiao da 。yan jiu ou yu de tu rang ci hua lv (χ)ping jun zhi wei 66.89×10~-88 m~3/kg,gao yu bei jing zhi ,shui ming yan jiu ou yu biao ceng chen ji wu zhong cun zai jiao jiang de ren wei lai yuan de ci xing kuang wu de fu ji 。SOFTyu SIRMcheng ji xian zhe zheng xiang guan ,shui ming MDhe PSDjing li de ya tie ci xing wu zhi shi yan jiu ou yu tu rang ci xing de zhu yao gong suo zhe 。lun wen yan jiu nei rong he jie guo ke wei chao hu biao ceng chen ji wu gong wu ran jian ce ji zhi li di gong can kao yi ju 。tu 34biao 14can 147
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论文作者分别是来自安徽理工大学的赵德文，发表于刊物安徽理工大学2019-07-08论文，是一篇关于湖泊论文,表层沉积物论文,汞污染论文,风险评估论文,环境磁学论文,安徽理工大学2019-07-08论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自安徽理工大学2019-07-08论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：湖泊论文; 表层沉积物论文; 汞污染论文; 风险评估论文; 环境磁学论文; 安徽理工大学2019-07-08论文;