http://ir.isl.ac.cn:80/handle/363002/5 2026-07-01T10:29:00Z 2026-07-01T10:29:00Z Ma, Yun-Qi Peng, Zhang-Kuang Yang, Jian Xiao, Ying-Kai Zhang, Yan-Ling http://ir.isl.ac.cn:80/handle/363002/34571 2022-03-29T09:33:11Z 2022-03-29T09:33:11Z

题名: Determination of boron content and isotopic composition in gypsum by inductively coupled plasma optical emission 作者: Ma, Yun-Qi; Peng, Zhang-Kuang; Yang, Jian; Xiao, Ying-Kai; Zhang, Yan-Ling 摘要: As a stable isotope, boron plays an important role in hydrogeology, environmental geochemistry, ore deposit geochemistry and marine paleoclimatology. However, there is no report of boron isotopic composition in gypsum. This is mainly confined to complete dissolution of Gypsum by water or acid. In this study, gypsum was converted to calcium carbonate (CaCO3) with ammonium bicarbonate(NH4HCO3) by two steps at 50 degrees C. In every step, the mass ratio of NH4HCO3/CaSO4 center dot 2H(2)O was twice, and conversion rate reached more than 98%. Converted CaCO3 was totally dissolved with hydrochloric acid (the dissolution rate was over 99%). In order to overcome the difficulties of the matrix interference and the detection limit of Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES), we use Amberlite IRA 743 resin to purify and enrichment the boron at first, then eluting boron from the resin with 10 mL 0.1 mol/L hydrochloric acid at 75 degrees C. The boron isotopic composition of natural gypsum samples was determined using positive thermal ionization mass spectrometry (P-TIMS). The boron isotopic composition of gypsum may be an excellent indicator for the formation environment.

2022-03-29T09:33:11Z Li, Xiangzhong Zhou, Xin Liu, Weiguo Fan, Guoqing Cheng, Peng Xu, Liming http://ir.isl.ac.cn:80/handle/363002/34569 2022-03-29T09:33:09Z 2022-03-29T09:33:09Z

题名: Oxygen isotopic composition of bulk carbonates in recent sediments from Lake Kuhai (NW China) 作者: Li, Xiangzhong; Zhou, Xin; Liu, Weiguo; Fan, Guoqing; Cheng, Peng; Xu, Liming 摘要: The water resource issue is one of the most significant problems in the Yellow River basin, and has received much attention from the public and government because of the dramatically decreased Yellow River streamflow in the last several years. In this study, oxygen isotopic compositions of bulk carbonates from Lake Kuhai in the headwaters of the Yellow River were evaluated as an indirect proxy of past Yellow River streamflow in order to place the recent flow reduction in a long-term context. The results indicated that delta 18O values of bulk carbonates from core KHC14-1 generally vary with changes in the Yellow River streamflows related to the precipitation/evaporation (temperature) ratio above the Tangnaihai hydrological station over the past 50 years. In general, the Yellow River streamflow in the headwaters area continued to decrease from the early 1980s to the late 1990s because of decreased precipitation and increased temperature. Then, the streamflow increased with enhancing precipitation over the last two decades. In addition, delta O-18 values of bulk carbonates in the Lake Kuhai core roughly correlate with the streamflows of the upper reaches of the Yellow River recorded by tree ring width over the past 800 years. The enriched delta O-18(BC) values showed that the precipitation/evaporation (P/E) ratio or streamflow was very low and the climate might be very dry in the middle of the 1400s CE in the headwaters of the Yellow River over the past 800 years. Our results suggested that changes in the P/E ratio or streamflow of the upper reaches of the Yellow River were dominated by variations in Indian Summer Monsoon precipitation over a long time scale, consistent with other records from the northeastern Tibetan Plateau. (C) 2016 Elsevier Ltd. All rights reserved.

2022-03-29T09:33:09Z Li, Xiangzhong Liu, Weiguo Zhou, Xin Xu, Liming Cheng, Peng http://ir.isl.ac.cn:80/handle/363002/34570 2022-03-29T09:33:09Z 2022-03-29T09:33:09Z

题名: A 700-year macrophyte productivity record inferred from isotopes of macrophyte remains and bulk carbonates in Lake Koucha, northeast Qinghai-Tibetan Plateau 作者: Li, Xiangzhong; Liu, Weiguo; Zhou, Xin; Xu, Liming; Cheng, Peng 摘要: The isotopic composition of total organic carbon (TOC) in lakes has been widely used to interpret paleoclimatic changes and the depositional environments of lake sediments. However, the main factors that affect the carbon isotopes of TOC may vary in different lake sediment records, limiting the ability of organic carbon isotopes to explain biogeochemical and environmental changes, especially in lakes with a large number of aquatic plants. In this study, the delta C-13 values of macrophyte remains and bulk carbonate in a sedimentary core from Lake Koucha were investigated to evaluate their paleoenvironmental implications. We found that the bulk carbonate was dominated by authigenic carbonates formed in the lake and that their delta O-18 and delta C-13 values can be used to reconstruct environmental changes in the Lake Koucha area. The macrophyte productivity derived from the carbon isotopic offset between the macrophyte remains and the bulk carbonate (epsilon(remains-BC)) in the Lake Koucha area agree well with total solar irradiance (TSI) records inferred from Delta Be-10 and temperature records based on tree rings from the Qinghai-Tibetan Plateau. Although the distribution of macrophytes is related to water depth according past studies and our observations in the field, our findings suggest that changes in macrophyte productivity may be primarily driven by temperature changes in the Lake Koucha area. (C) 2015 Elsevier Ltd and INQUA. All rights reserved.

2022-03-29T09:33:09Z Wang, Yixuan Chen, Tianyuan E, Chongyi An, Fuyuan Lai, Zhongping Zhao, Lin Liu, Xiang-Jun http://ir.isl.ac.cn:80/handle/363002/34505 2022-03-29T07:55:20Z 2022-03-29T07:55:20Z

题名: Quartz OSL and K-feldspar post-IR IRSL dating of loess in the Huangshui river valley, northeastern Tibetan plateau 作者: Wang, Yixuan; Chen, Tianyuan; E, Chongyi; An, Fuyuan; Lai, Zhongping; Zhao, Lin; Liu, Xiang-Jun 摘要: The northeastern Tibetan Plateau (NETP) is located in the climatically sensitive semiarid zone between the regions controlled by the East Asian monsoon and the Westerlies and loess deposits there may preserve a record of regional paleoenvironmental change. Establishing a robust loess chronology is critical for interpreting and correlating environmental records. In this study, quartz optical stimulated luminescence (OSL) and K-feldspar post-IR infrared (IR) stimulated luminescence (pIR-IRSL) dating methods have been used to date the Ledu loess section in the Huangshui river valley, on the NETP. In terms of quartz OSL dating, the results from both the 63-90 mu m and 38-63 mu m quartz fractions are consistent within errors. The reliability of the 63-90 mu m K-feldspar pIRIR dating was confirmed by internal check using preheat plateau, dose recovery, anomalous fading, and residual dose tests. The results suggest that the K-feldspar pIRIR signals at stimulation temperatures of 170 and 225 degrees C were well bleached before deposition of Ledu loess. Comparison between quartz OSL and K-feldspar pIRIR dating indicates that quartz ages older than 50 ka (similar to 150 Gy) may be underestimated. In establishing the chronological framework for the study section, we selected quartz OSL results for ages < 50 ka and the K-feldspar pIRIR(170) and pIRIR(225) results for ages > 50 ka. The results demonstrate that aeolian dust accumulated continuously between 67 and 25 ka, and there were two gaps in deposition, between 25 and 2 ka and from 80 to 67 ka.

2022-03-29T07:55:20Z Wu, Jun Lu, Jian Li, Leiming Min, Xiuyun Luo, Yongming http://ir.isl.ac.cn:80/handle/363002/34503 2022-03-29T07:55:19Z 2022-03-29T07:55:19Z

题名: Pollution, ecological-health risks, and sources of heavy metals in soil of the northeastern Qinghai-Tibet Plateau 作者: Wu, Jun; Lu, Jian; Li, Leiming; Min, Xiuyun; Luo, Yongming 摘要: The Qinghai-Tibet Plateau, especially the northeastern region, is not a pure land any more due to recently increasing anthropogenic activities. This study collected soil samples from 70 sites of the northeastern Qinghai-Tibet Plateau to evaluate pollution, ecological-health risks, and possible pollution sources of heavy metals. The concentrations of heavy metals in soil were relatively high. Values of geo-accumulation index exhibited that Hg pollution was the most serious meanwhile Hg possessed the strongest enrichment feature based on enrichment factor values. The modified degrees of contamination showed that about 54.3% and 17.1% of sampling sites were at moderate and high contamination degree while pollution load indexes illustrated that 72.9% and 27.1% of sampling sites possessed moderate and high contamination level, respectively. Ecological risk indexes of heavy metals in soil ranged from 234.6 to 3759.0, suggesting that most of sites were under considerable/very high risks. Cancer risks for adults and children were determined as high and high-very high levels while non-cancer risks for children were high although those for adults were low. Industrial source contributed to the main fraction of ecological and health risks. Summarily speaking, heavy metals in soil of the study area has caused significantly serious pollution and exerted high potential ecological and health risks, especially for children who are more susceptible to hurt from pollutants. Therefore, more efficient and strict pollution control and management in study area should be put out as soon as possible. (C) 2018 Elsevier Ltd. All rights reserved.

2022-03-29T07:55:19Z Wu, Jun Lu, Jian Min, Xiuyun Zhang, Zhenhua http://ir.isl.ac.cn:80/handle/363002/34504 2022-03-29T07:55:19Z 2022-03-29T07:55:19Z

题名: Distribution and health risks of aerosol black carbon in a representative city of the Qinghai-Tibet Plateau 作者: Wu, Jun; Lu, Jian; Min, Xiuyun; Zhang, Zhenhua 摘要: Although aerosol black carbon (BC) exerts strong influences on human health, research on potential health risks of aerosol BC around the Qinghai-Tibet Plateau is very limited. This is the very first study to investigate the distribution of aerosol BC in a typical city of the Qinghai-Tibet Plateau and the resulting health risks. The results showed that the maximal real-time (5-min monitoring interval) concentration of aerosol BC was 22.34 pg/m 3 , much higher than day- and week-averaged concentrations which were in the range of 1.28-6.15 and 1.93-4.63 gg/m 3 , respectively. The health risks were evaluated using four different health endpoints including low birth weight (LBW), percentage lung function decrement of school-aged children (PLFD), cardiovascular mortality (CM), and lung cancer (LC). The highest risks of LBW, PLFD, CM, and LC had reached 69.5, 184.4, 67.4, and 31.8 numbers of equivalent passively smoked cigarettes (PSC), respectively. The concentrations and health risks of aerosol BC in the study area are at a middle level among the global cities/regions. In comparison, the cities of the Qinghai-Tibet Plateau are experiencing high potential health risks resulting from aerosol BC to need more effective prevention and control of air pollution.

2022-03-29T07:55:19Z 杨红军,柴小丽,王敏,李冰 http://ir.isl.ac.cn:80/handle/363002/34502 2022-03-29T07:55:18Z 2022-03-29T07:55:18Z

题名: NaCl-H2O和NaCl-KCl-H2O溶液低温相变过程的原位XRD研究 作者: 杨红军,柴小丽,王敏,李冰 摘要: 应用原位X射线衍射法对盐湖卤水体系的两个子体系———NaCl-H2O和NaCl-KCl-H2O溶液在低温条件下进行扫描,获得了实验条件下体系的衍射图谱,得到了溶液低温相变过程的信息。图谱解析结果表明:含NaCl 26.25%的溶液在-20-25℃范围内析出了冰、NaCl、低水合氯化钠和二水氯化钠,含NaCl25.70%的溶液没有发生相变;对于NaCl-KCl-H2O体系,含NaCl 20.03%和KCl 10.19%的溶液在0-25℃范围内析出了氯化钾和氯化钠,含NaCl 22.40%和KCl 7.28%的溶液在-10-25℃范围内只有氯化钾析出,含NaCl 21.90%和KCl 6.46%的溶液没有发生相变。实验结果显示:这两个水盐体系低温相变过程析出盐的种类与相图结果有差异,原因在于两者的状态不同;体系中二水氯化钠的析出需要经过氯化钠与水的化合过程,该过程是分步进行的;实验体系在低温条件下发生相变受结晶因素控制,温度只是其中一个因素,体系相变发生与否是结晶因素综合影响的结果。

2022-03-29T07:55:18Z 丛禄 王懿萱 孙爱军 高东林 刘向军 http://ir.isl.ac.cn:80/handle/363002/34320 2022-03-29T02:56:10Z 2022-03-29T02:56:10Z

题名: 青藏高原中部当穹错末次冰消期以来湖面变化研究 作者: 丛禄; 王懿萱; 孙爱军; 高东林; 刘向军 摘要: 青藏高原是西风与季风相互作用的关键区域,高原上的湖泊水位对气候变化响应极为敏感。本研究利用光释光测年方法对青藏高原中部当穹错东北岸高出现代湖面235 m的一个湖相沉积剖面(DQ)进行了测年,丰富了全新世当穹错湖泊演化的年代数据,并对前人重建的该湖末次冰消期以来的水位波动曲线进行了修订。之后结合TraCE-21 ka古气候模型模拟的当穹错-当惹雍错-许如错湖区古降水和古温度变化,分析了当穹错末次冰消期以来湖泊水位变化的原因。研究结果显示:当穹错湖泊水位在末次冰消期和早全新世(15.4～7.8 ka)期间比现在高235 m以上(高于DQ剖面),7.8 ka之后湖泊水位下降到该剖面以下,全新世期间最高水位出现在8.8～8.2 ka期间,此时湖泊面积可达2154.71 km~2。TraCE-21 ka模拟的年降水量在15 ka左右突然增加,自8 ka开始逐渐减少。模拟的降水变化与湖泊水位波动过程几乎同步,因此印度季风加强所导致的降水增加可能是当穹错末次冰消期和早全新世出现高湖面的主要原因。

2022-03-29T02:56:10Z 江玲玲 钟永恒 刘佳 李晓妍 王辉 李玉婷 葛飞 http://ir.isl.ac.cn:80/handle/363002/34319 2022-03-29T02:56:09Z 2022-03-29T02:56:09Z

题名: 全球钠产业技术竞争态势及青海省钠产业发展对策研究 作者: 江玲玲; 钟永恒; 刘佳; 李晓妍; 王辉; 李玉婷; 葛飞 摘要: 基于Incopat专利数据库,以1972—2020年钠产业相关专利数据为研究对象,从专利的角度对钠产业重要专利权人、主要技术研发团队、关键技术导航、技术构成等方面进行分析,梳理出全球钠产业、中国钠产业和青海钠产业各个环节的发展现状及特点。提出青海省钠产业未来发展应依托"一带一路"重大历史机遇,积极开拓钠产业国际市场、推进盐湖资源综合利用、加强专利布局、引进高端人才、提高专利技术成果转化能力等发展建议。

2022-03-29T02:56:09Z 李晓妍 刘佳 钟永恒 葛飞 http://ir.isl.ac.cn:80/handle/363002/34317 2022-03-29T02:56:08Z 2022-03-29T02:56:08Z

题名: 青海镁产业专利导航发展分析 作者: 李晓妍; 刘佳; 钟永恒; 葛飞 摘要: 通过对盐湖提镁技术与镁合金等重点技术的专利分析,得到全球镁产业链不同环节的技术优势国家;从镁合金的专利权人排名来看,日本和韩国的企业展现出优势;基于专利权人的分析,挖掘中国镁技术领域的主要研究团队等重要情报信息;通过对中国及青海镁产业的专利布局分析,确定中国镁产业技术优势省、相关研发机构,总结青海省在镁产业领域的当前水平与可能的突破点,对镁产业关键技术进行导航探究,深度剖析镁产业研究价值与发展空间。同时对青海盐湖产业发展的优劣势条件进行分析,提出青海镁产业未来发展应该结合本地特色增加专利申请量,综合开发利用资源,提升关键技术,加强人才引进,促进产学研深度融合等发展建议。

2022-03-29T02:56:08Z