Lakes play important roles in sustaining the ecosystem and economic development in Inner Mongolia Autonomous Region of China,but the spatial patterns and driving mechanisms of water quality in lakes so far remain uncl...Lakes play important roles in sustaining the ecosystem and economic development in Inner Mongolia Autonomous Region of China,but the spatial patterns and driving mechanisms of water quality in lakes so far remain unclear.This study aimed to identify the spatial changes in water quality and the driving factors of seven lakes(Juyanhai Lake,Ulansuhai Lake,Hongjiannao Lake,Daihai Lake,Chagannaoer Lake,Hulun Lake,and Wulannuoer Lake)across the longitudinal axis(from the west to the east)of Inner Mongolia.Large-scale research was conducted using the comprehensive trophic level index(TLI(Σ)),multivariate statistics,and spatial analysis methods.The results showed that most lakes in Inner Mongolia were weakly alkaline.Total dissolved solids and salinity of lake water showed obvious zonation characteristics.Nitrogen and phosphorus were identified as the main pollutants in lakes,with high average concentrations of total nitrogen and total phosphorus being of 4.05 and 0.21 mg/L,respectively.The values of TLI(Σ)ranged from 49.14 to 71.77,indicating varying degrees of lake eutrophication,and phosphorus was the main driver of lake eutrophication.The lakes of Inner Mongolia could be categorized into lakes to the west of Daihai Lake and lakes to the east of Daihai Lake in terms of salinity and TLI(Σ).The salinity levels of lakes to the west of Daihai Lake exceeded those of lakes to the east of Daihai Lake,whereas the opposite trend was observed for lake trophic level.The intensity and mode of anthropogenic activities were the driving factors of the spatial patterns of lake water quality.It is recommended to control the impact of anthropogenic activities on the water quality of lakes in Inner Mongolia to improve lake ecological environment.These findings provide a more thorough understanding of the driving mechanism of the spatial patterns of water quality in lakes of Inner Mongolia,which can be used to develop strategies for lake ecosystem protection and water resources management in this region.展开更多
建立了搅拌棒吸附萃取-液相色谱-串联质谱(SBSE-LC-MS/MS)法测定农业废水中二氯吡啶酸残留量的分析方法。样品经搅拌棒吸附萃取,以BEH C 18柱为分析柱,以乙腈和0.1%甲酸溶液为流动相进行梯度洗脱,采用质谱测定。结果表明:二氯吡啶酸质...建立了搅拌棒吸附萃取-液相色谱-串联质谱(SBSE-LC-MS/MS)法测定农业废水中二氯吡啶酸残留量的分析方法。样品经搅拌棒吸附萃取,以BEH C 18柱为分析柱,以乙腈和0.1%甲酸溶液为流动相进行梯度洗脱,采用质谱测定。结果表明:二氯吡啶酸质量浓度在1.0~50.0 ng/mL范围内与其质谱响应值呈线性关系,相关系数(r)为0.9998;方法检出限为0.3μg/L,方法定量限为1.0μg/L;加标回收率范围87.8%~97.8%;相对标准偏差(RSD,n=6)为0.9%~4.7%。本方法操作简便、试剂消耗少、准确度高、检出限低,适用于农业废水中二氯吡啶酸含量监测。展开更多
基金funded by the National Key Research and Development Program of China(2021YFC3201203)the Major Science and Technology Projects of Inner Mongolia Autonomous Region(2020ZD0009)+2 种基金the National Natural Science Foundation of China(51869014)the Open Project Program of the Ministry of Education Key Laboratory of Ecology and Resources Use of the Mongolian Plateau(KF2020006)the Special Funds for Innovation and Entrepreneurship of Postgraduates in Inner Mongolia University(11200-121024).
文摘Lakes play important roles in sustaining the ecosystem and economic development in Inner Mongolia Autonomous Region of China,but the spatial patterns and driving mechanisms of water quality in lakes so far remain unclear.This study aimed to identify the spatial changes in water quality and the driving factors of seven lakes(Juyanhai Lake,Ulansuhai Lake,Hongjiannao Lake,Daihai Lake,Chagannaoer Lake,Hulun Lake,and Wulannuoer Lake)across the longitudinal axis(from the west to the east)of Inner Mongolia.Large-scale research was conducted using the comprehensive trophic level index(TLI(Σ)),multivariate statistics,and spatial analysis methods.The results showed that most lakes in Inner Mongolia were weakly alkaline.Total dissolved solids and salinity of lake water showed obvious zonation characteristics.Nitrogen and phosphorus were identified as the main pollutants in lakes,with high average concentrations of total nitrogen and total phosphorus being of 4.05 and 0.21 mg/L,respectively.The values of TLI(Σ)ranged from 49.14 to 71.77,indicating varying degrees of lake eutrophication,and phosphorus was the main driver of lake eutrophication.The lakes of Inner Mongolia could be categorized into lakes to the west of Daihai Lake and lakes to the east of Daihai Lake in terms of salinity and TLI(Σ).The salinity levels of lakes to the west of Daihai Lake exceeded those of lakes to the east of Daihai Lake,whereas the opposite trend was observed for lake trophic level.The intensity and mode of anthropogenic activities were the driving factors of the spatial patterns of lake water quality.It is recommended to control the impact of anthropogenic activities on the water quality of lakes in Inner Mongolia to improve lake ecological environment.These findings provide a more thorough understanding of the driving mechanism of the spatial patterns of water quality in lakes of Inner Mongolia,which can be used to develop strategies for lake ecosystem protection and water resources management in this region.
文摘建立了搅拌棒吸附萃取-液相色谱-串联质谱(SBSE-LC-MS/MS)法测定农业废水中二氯吡啶酸残留量的分析方法。样品经搅拌棒吸附萃取,以BEH C 18柱为分析柱,以乙腈和0.1%甲酸溶液为流动相进行梯度洗脱,采用质谱测定。结果表明:二氯吡啶酸质量浓度在1.0~50.0 ng/mL范围内与其质谱响应值呈线性关系,相关系数(r)为0.9998;方法检出限为0.3μg/L,方法定量限为1.0μg/L;加标回收率范围87.8%~97.8%;相对标准偏差(RSD,n=6)为0.9%~4.7%。本方法操作简便、试剂消耗少、准确度高、检出限低,适用于农业废水中二氯吡啶酸含量监测。
