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Chemical composition and Pb(II)binding of dissolved organic matter in a hypersaline lake in China

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Journal of Oceanology and Limnology 2022年第1期40卷 113-127页

作者： Keli YANG Yaoling ZHANG yaping dong Wu LI Key Laboratory of Comprehensive and Highly Effi cient Utilization of Salt Lake Resources Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China Qinghai Technology Research and Development Center of Comprehensive Utilization of Salt Lakes Resources Xining 810008China Qinghai Provincial Key Laboratory of Resources and Chemistry of Salt Lakes Xining 810008China

Dissolved organic matter(DOM)plays a vital role in promoting carbon and nutrient *** is a food source for organisms and controls the migration and transformation of trace metals and other contaminants in aquatic *** contributions of aquatic DOM to the environment and ecology of a system are closely related to its abundance and chemical *** this study,the chemical composition and binding properties of DOM in a hypersaline lake watershed were investigated for the fi rst time using dissolved organic carbon(DOC)analysis,absorption spectroscopy,Fourier transform infrared spectroscopy,pyrolysis-GC-MS(Py-GC-MS),and fl uorescence parallel factor(PARAFAC)analysis combined with Pb(II)titration *** results showed that DOM from the tributaries that fl owed into the lake had a lower DOC content,higher molecular weight,and higher specifi c UV absorbance than the DOM in lake ***-like fl uorophores were mainly found in tributary and lake surface water DOM(LSDOM)and humic-like substances were abundant in lake groundwater DOM(LGDOM).Using this multi-methodological approach,we found that the DOM from the hypersaline lake watershed was mainly from microbial origins,and consisted of aromatics,carbohydrates,and *** results from quantitative analysis showed that DOM from the infl owing tributaries contained more aromatics,lower carbohydrates,and lower aliphatics than DOM in the *** aromatic hydrocarbons and carbohydrates were more abundant in LSDOM than *** results from the Pb(II)titration technique coupled with PARAFAC analysis suggested that PARAFAC-derived components had relatively low condition stability constants(log K_(M)<2).Of the two types of lake DOM,the LGDOM had a higher Pb(II)binding potential than the *** this study we have improved our understanding of how DOM within a hypersaline lake watershed varies in its composition and potential to bind with metals.

关键词： dissolved organic matter hypersaline lake watershed composition parallel factor analysis Pb(II)titration

Measured and Predicted Solubility Phase Diagrams of Quaternary Systems LiBr-NaBr-MgBr2-H2O and LiBr-KBr-MgBr2-H2O at 298.15 K

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Chemical Research in Chinese Universities 2020年第6期36卷 1234-1240页

作者： CUI Ruizhi LI Wu dong yaping LI Jun Key Laboratory of Comprehensive and Highly Ejficient Utilization of Salt Lake Resources Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008P.R.China Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008P.R.China Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008P.R.China

The stable phase equilibria of quaternary systems LiBr-NaBr-MgBrz-H2O and LiBr-KBr-MeBr-HO at 298.15 K were studied by both experimental measurement(isothermal solution saturation method)and theoretica prediction(Pitzer model).The solubilities of the saturated solution have been determined experimentally and two sta ble phase diagrams and relevant water diagrams of the two quaternary systems were *** show that qua ternary system LiBr-NaBr-MgBrz-H2O is hydrateⅡtype as NaBr and NaBr-2H2O *** phase diagran consists of only one invariant point,four univariant curves,and five crystallization *** quaternary system LiBr-KBr-MgBr2-H2O is a complex type as the double salt KBr MgBrz-6H2O *** addition to this double salt the three single salts LiBr-2H2O,KBr and MgBr2:6H2O also *** this paper,the solubilities of phase equilibria in above quaternary systems were also calculated by the Pitzer's electrolyte solution *** the neededparameters can be obtained from the literature or be fitted by experimental *** the Basis of the experimental and alculated results,the phase diagram of the quaternary system was plotted for *** shows that the calculation results are consistent with the experimental ones.

关键词： Brine Solubility Phase diagram Bromide Pitzer's model

Preparation of MnO2-Al2O3 adsorbent with large specific surface area for fluoride removal

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Particuology 2016年第4期14卷 66-71页

作者： Naicai Xu Zhong Liu Shaoju Bian yaping dong Wu Li Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Resources Qinghai Institute of Salt Lakes Chinese Academy of Sciences Xining 810008 China Department of Chemistry Qinghai Normal University Xining 810008 China University of the Chinese Academy of Sciences Beijing 100049 China

MnO2-Al2O3 （MOAO） binary nanocomposite with a 1：3 MnO2 to Al2O3 molar ratio was synthesized by impregnation technique using mesoporous alumina （MA） precursor. The MOAO product consisted of MA and amorphous MnO2. The manganese valence in MOAO was ＋4, indicative of MnO2 being coated on the surface of MA during the impregnation process. MOAO had a large specific surface area （385.266 m^2/g） and wormhole-like mesoporous structure. The average pore size, which could be precisely controlled over the range of 3.4-4.1 nm. The optimum removal of fluoride was obtained when the initial pH was in the range of 4-10. The defluorination efficiency of MOAO was far superior to that of MA when the initial fluoride concentration exceeded 40 mg/L. The large surface area and bimodal porous structure of MOAO after coating MnO2 may be responsible for the high removal efficiency in the defluorination process.

关键词： Alumina MnO2-Al2O3 Mesoporous structure Structure properties Adsorption

Experimental Design in the Analysis of Interferential Effects for the Determination of Rubidium in Chloride-type Brine by Atomic Absorption Spectrometry Technique

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Chinese Journal of Chemistry 2011年第9期29卷 1927-1932页

作者： Gao, Dandan dong, yaping Li, Wu Xu, Bin Li, Yahong Qinghai Institute of Salt Lakes Chinese Academy of Sciences Xining Qinghai 810008 China Key Laboratory of Organic Synthesis of Jiangsu Province College of Chemistry Chemical Engineering and Material Science Soochow University Suzhou Jiangsu 215123 China Graduate School of Chinese Academy of Sciences Beijing 100049 China

Experimental design （DOE） was employed to precisely determine the content of rubidium in chloride type brine of Qionglai （A city in Sichuan province, southwest of China） using atomic absorption spectrometry （AAS） technique. From the statistical analysis of six factors, it was found that K＋ and CI- were the significant interfering elements for the determination of rubidium. A model was established to eliminate the interference effects of K＋ and Cl . The experimental results indicate that, under the optimal conditions, the developed method for the rubidium determination possesses the advantages of low detection limit （0.019 μg·mL^-1 at a significant level of 0.05） and higher recovery （97.2%--103.4%）.

关键词： experimental design rubidium determination atomic absorption spectrometry

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极端顶点法制备碳酸钙超疏水涂层

盐湖研究 2024年第2期32卷 17-23页

作者：程远吴鹏刘鑫乃学瑛董亚萍中国科学院青海盐湖研究所中国科学院盐湖资源综合高效利用重点实验室青海西宁810008 青海盐湖资源综合利用技术研究开发中心青海西宁810008 中国科学院大学北京100049

目前,超疏水涂层存在着制备成本高、工艺复杂和环境污染等问题,阻碍了其工程化应用进程。文章以CaCO_(3)晶须及其纳米粒子为填料,水性苯丙乳液为粘结剂,以及硬脂酸锌为疏水改性剂制备超疏水涂层。首先采用油酸对CaCO_(3)晶须及其纳米粒... 详细信息

目前,超疏水涂层存在着制备成本高、工艺复杂和环境污染等问题,阻碍了其工程化应用进程。文章以CaCO_(3)晶须及其纳米粒子为填料,水性苯丙乳液为粘结剂,以及硬脂酸锌为疏水改性剂制备超疏水涂层。首先采用油酸对CaCO_(3)晶须及其纳米粒子进行表面改性,然后基于极端顶点设计将改性后的CaCO_(3)晶须、改性后的纳米CaCO_(3)、苯丙乳液和硬脂酸锌为混合分量进行混料实验,以涂层接触角为响应变量建立回归模型,分析混合分量对接触角的影响。结果表明:采用不同形貌的CaCO_(3)粉体复合苯丙乳液可制备出超疏水涂层,在纳米CaCO_(3)与硬脂酸锌混合分量较高,CaCO_(3)晶须混合分量较低以及苯丙乳液适中的区域,接触角可达153.5°。通过表面形貌分析,涂层的黏附性与其表面的孔洞有关,而较高的纳米CaCO_(3)混合分量可降低涂层表面粗糙度,促进其超疏水性能。

关键词：碳酸钙晶须苯丙乳液超疏水涂层极端顶点法

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某煤矿区土壤中重金属污染状况及风险评估

广东化工 2024年第5期51卷 108-110页

作者：董亚萍张快凡徐茜武建英太原工业学院环境与安全工程系山西太原030008

为了探究山西省某煤矿区粗放式的矿业活动对矿区周边农田土壤的重金属污染状况以及种植农作物后,农作物体内的重金属含量对人类产生的不良效应,用梅花取样法选取矿区周围的土壤作为研究对象,采用电感耦合等离子体发射光谱仪测定了土壤中... 详细信息

为了探究山西省某煤矿区粗放式的矿业活动对矿区周边农田土壤的重金属污染状况以及种植农作物后,农作物体内的重金属含量对人类产生的不良效应,用梅花取样法选取矿区周围的土壤作为研究对象,采用电感耦合等离子体发射光谱仪测定了土壤中的Cu、Cr、Ni、Zn、Cd、Pb六种重金属含量及农田土壤中生长小白菜中重金属的含量。结果表明:土壤中六种重金属含量分别为17.8 mg/kg、48.8 mg/kg、25.2 mg/kg、65.9 mg/kg、0.3 mg/kg、19.1 mg/kg,采用单因子指数和内梅罗综合污染指数法评价该区土壤重金属污染程度,并进行土壤重金属含量分析。以山西省土壤背景值为参比,由单因子污染指数法得出:研究区土壤存在污染;内梅罗综合污染指数得出:研究区土壤达到中度污染水平。通过对小白菜各部位重金属含量监测,富集系数表明:各部位富集重金属能力大小为根>茎>叶。因此,应对调查地块采取有效的治理措施,避免重金属污染损害人体健康。

关键词：煤矿区土壤污染重金属风险评估

显微夹闭治疗小脑前下动脉远端动脉瘤1例报道及文献复习

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中华神经医学杂志 2024年第9期23卷 925-927页

作者：杨忠平董亚平乔瑞华陈建华张春强闫经纬山西医科大学第三医院山西白求恩医院(山西医学科学院)同济山西医院神经外科太原030032 霍州市人民医院神经外科霍州031400

小脑前下动脉(anterior inferior cerebellar artery aneurysm,AICA)远端动脉瘤临床较罕见,患病率为颅内动脉瘤的0.10%~0.98%,且开颅手术或介入治疗的难度、风险均较高[1,2]。另外,AICA远端动脉瘤多数位于内听道附近桥小脑角区域,位于... 详细信息

小脑前下动脉(anterior inferior cerebellar artery aneurysm,AICA)远端动脉瘤临床较罕见,患病率为颅内动脉瘤的0.10%~0.98%,且开颅手术或介入治疗的难度、风险均较高[1,2]。另外,AICA远端动脉瘤多数位于内听道附近桥小脑角区域,位于皮层段者非常罕见,而合并同侧小脑后下动脉闭塞的AICA远端皮层段动脉瘤更是极其罕见。笔者现报道山西省霍州市人民医院神经外科于2024年2月9日收治的1例合并同侧小脑后下动脉闭塞的AICA尾侧干远端皮层段动脉瘤患者的诊治经过,并结合文献进行复习,旨在为AICA远端动脉瘤的诊治提供参考。

关键词：颅内动脉瘤小脑前下动脉远端显微外科手术

Study of Lithium Exploitation from Tibetan Kyetsé Tsakha and Lungmu Tso Salines by Freezing and Mixing

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 414-416页

作者： ZHU Chengcai dong Meng ZENG Yun ZHU Xianling LI Wu dong yaping Key Laboratory of Salt Lake Resources and Chemistry Qinghai Institute of Salt Lakes Chinese Academy of Sciences Tibet Guoneng Mining Industly Development Co. Ltd.

1 Introduction Lithium was used widely in batteries,lubricants,aluminium smelting,ceramics,glass,polymers and other areas due to its unique electrochemical reactivity as well as other properties(Hykawy,2010).Productio... 详细信息

关键词： Salt-lakes Kyetsé Tsakha,Lungmu Tso,Lithium carbonate

Chemical characterization of fractions of dissolved humic substances from a marginal sea—a case from the Southern Yellow Sea

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Journal of Oceanology and Limnology 2018年第2期36卷 238-248页

作者： ZHANG Yaoling YANG Keli DU Jinzhou ZHANG Fenfen dong yaping LI Wu Qinghai Institute of Salt Lakes Chinese Academy of Sciences Xining 810008 China State Key Laboratory of Estuarine and Coastal Research East China Normal University Shanghai 200062 China

Marine dissolved organic matter （DOM） is one of the largest dynamic pools of organic carbon in the global carbon cycle, yet DOM is still chemically poorly characterized. To better understand the origin, composition, and cycling of DOM in the China marginal sea, dissolved humic substances （DHS） were isolated from seawaters in two locations in the Southern Yellow Sea. The DHS were subdivided into fulvic acids （FAs）, humic acids （HAs） and the XAD-4 fractions. Complementary analytical approaches were used to characterize the isolated DHS samples including stable carbon isotopic composition, Fourier transform infrared spectroscopy （FTIR）, ~3C cross polarization magic angle spinning （CP/MAS） nuclear magnetic resonance （NMR）, and pyrolysis gas chromatography-mass spectrometry （Py-GC/MS）. The results demonstrated that both DHS samples encountered the influences from marine source, indicating that algal and microbial-derived materials are the predominant precursors for the studied samples. The three fractions of DHS showed different properties. FAs presented more aromatic features, whereas HAs contained more aliphatic lipids and proteinaceous materials. The XAD-4 fractions were enriched in 13C and contained more carbohydrates but less aromatic compounds. The lower molecular weight and higher heteroatom content and number of carboxyl groups for the XAD-4 fractions may give them considerable geochemical significance for aspects of trace metal species, bioavailability of pollutants, mineral weathering and water acidification in marine environments.

关键词： seawater fulvic acid humic acid the XAD-4 fraction NMR Py-GC/MS