To understand the levels of potentially toxic elements(PTEs)contamination in soils and their effects on human health from different agricultural land use in Sanya,China.128 soil samples(64 topsoil samples and correspo...To understand the levels of potentially toxic elements(PTEs)contamination in soils and their effects on human health from different agricultural land use in Sanya,China.128 soil samples(64 topsoil samples and corresponding subsoil samples)were collected from the five representative land-use patterns.Inductively coupled plasma mass spectrometry(ICP-MS),Atomic fluorescence spectrometry(AFS),and Inductively coupled plasma optical emission spectrometry(ICP-OES)were used to determine the content of PTEs(As,Cd,Hg,Cu,Cr,Ni,Pb,Zn,Co,Mo,Sb,and V).Correlation analysis and factor analysis were used to determine the source of PTEs.Geo-accumulation index(I_(geo)),hazard quotient(HQ),and total carcinogenic risk index(TR)were used to measure the PTEs contamination and its relative health impacts.Results showed that the average values of 12 PTEs in topsoil were higher than the Hainan soil geochemical baseline,showing different degrees of PTEs accumulation effect.The concentration of PTEs in the topsoil was lower than those in the subsoil except for Cd and Hg.The I_(geo)revealed that the major accumulated element in soils was As followed by Mo.Source apportionment suggested that parent materials and agricultural practices were the dominant factors for PTEs accumulation in the topsoil.Noncarcinogenic risks of soil samples from five land-use patterns presented a trend of paddy field>dry field>woodland>orchard>garden plot.However,the HQ values of 12 PTEs were less than the recommended limit of HQ=1,representing that there are no non-carcinogenic risks of PTEs for children and adults in the study area.The TR values are within 6.95×10^(-6)-1.38×10^(-5),which corresponds to the low level.Therefore the PTEs in the agricultural soil of the study area show little influence on the health status of the local population.展开更多
The risk assessment right from the source of emissions can effectively guide the pollution control. A model was established, consisting of four part： source estimation, environmental fate analysis, exposure analysis ...The risk assessment right from the source of emissions can effectively guide the pollution control. A model was established, consisting of four part： source estimation, environmental fate analysis, exposure analysis and risk assessment. The human health risk, ecological risk and total risk of lead emissions were assessed. The factors were estimated to indicate the environmental decrease and exposure probability. Of all the 1887 t emissions in China in 2010（quantified in the previous work）, it is turned out 1.3 t reached human bodies（0.9 mg/ca）, and 2.7 t reached the ecosystem. Lead mainly came from the Use stage for the source while lead causing risk mainly came from the Waste Management Recycling and Production stages. As for chemical forms, PbO contributed most to the human health risk and PbSO_4 contributed most to the ecological risk. PbSO_4, PbO and Pb altogether contributed 71% to the total risk, indicating these three chemicals should be taken priority for the risk management.展开更多
The occurrence and accumulation of total mercury (T-Hg) in sediments collected from the Yarlung Zangbo River (YLZB),the Lhasa River,the Niyang River and the Palongzangbu River were analyzed and the soil samples simult...The occurrence and accumulation of total mercury (T-Hg) in sediments collected from the Yarlung Zangbo River (YLZB),the Lhasa River,the Niyang River and the Palongzangbu River were analyzed and the soil samples simultaneously collected from the bank were employed as control.Meanwhile,pollution status and potential ecological risk of Hg were calculated and assessed using index of geoaccumulation ( I geo ) and potential ecological risk assessment method (Er) in this study.The results showed that the T-Hg concentrations in sediments at eight sections of YLZB ranged from 4.23 to 48.1 μg/kg with mean concentration of 25.1 μg/kg,which was higher than background Hg value of soils in Tibet.T-Hg concentrations in sediments at three typical segments of YLZB were all significantly higher than those in soils collected from its bank (P<0.05).The Igeo and E r indexes revealed that the T-Hg pollution levels were slight pollution in two sections and moderate ecological risk in six sections of YLZB.Hg pollution risks also existed in the sediments of partial sections of the Lhasa River and the Niyang River,and slightly moderate Hg contamination with high ecological risk was presented in Lhasa urban district.The level of Hg in sediments of YLZB showed a notable spatial distribution characteristic with a trend of increasing firstly and then declining.Human activities played an important role in increasing Hg content in sediments of the river.展开更多
目的:采用Logistic回归分析和ROC曲线评估步态运动学特征联合MRI总负荷对脑小血管病(cerebral small vessel disease,CSVD)步态障碍患者跌倒风险的预测价值。方法:选取2019年3月1日—2020年3月30日就诊于甘肃省人民医院中法神经康复科...目的:采用Logistic回归分析和ROC曲线评估步态运动学特征联合MRI总负荷对脑小血管病(cerebral small vessel disease,CSVD)步态障碍患者跌倒风险的预测价值。方法:选取2019年3月1日—2020年3月30日就诊于甘肃省人民医院中法神经康复科诊断为CSVD且以步态障碍为主要症状的43例患者为研究对象,统计临床数据,根据TUG测试时间将所有患者分为高跌倒风险(high risk of falling,HRF;TUG时间≥15s)组和低跌倒风险(low risk of falling,LRF;TUG时间<15s)组,采用Logistic回归分析和ROC曲线评估步态运动学特征联合MRI总负荷对CSVD步态障碍患者跌倒风险的预测价值。结果:研究共纳入43例患者,平均年龄(71.07±8.17)岁。其中女性26例(60.4%),高血压患者30例(69.8%),Logistic回归分析显示,在校正年龄和TUG后,步长(OR 0.821,95%CI 0.702—0.959,P=0.013)为CSVD步态障碍患者跌倒风险的独立保护因素,MRI总负荷(OR 4.217,95%CI 1.444—12.317,P=0.009)为CSVD步态障碍患者跌倒风险的独立危险因素。ROC曲线分析显示步长和MRI总负荷联合对CSVD步态障碍患者的跌倒风险具有较高的预测价值(AUC=0.904),敏感性为82.6%,特异性为90%。结论:步长联合MRI总负荷对CSVD步态障碍患者的跌倒风险有较高的预测价值。展开更多
基金supported by Open Foundation of the Key Laboratory of Coupling Process and Effect of Natural Resources Elements(No.2023KFKTB001)the Science&Technology Fundamental Resources Investigation Program(2022FY101800)+2 种基金the National Nonprofit Institute Research Grant of IGGE(AS2023D01)the projects of the China Geological Survey(DD20230309 and DD20190305)the National Natural Science Foundation of China(42002105)。
文摘To understand the levels of potentially toxic elements(PTEs)contamination in soils and their effects on human health from different agricultural land use in Sanya,China.128 soil samples(64 topsoil samples and corresponding subsoil samples)were collected from the five representative land-use patterns.Inductively coupled plasma mass spectrometry(ICP-MS),Atomic fluorescence spectrometry(AFS),and Inductively coupled plasma optical emission spectrometry(ICP-OES)were used to determine the content of PTEs(As,Cd,Hg,Cu,Cr,Ni,Pb,Zn,Co,Mo,Sb,and V).Correlation analysis and factor analysis were used to determine the source of PTEs.Geo-accumulation index(I_(geo)),hazard quotient(HQ),and total carcinogenic risk index(TR)were used to measure the PTEs contamination and its relative health impacts.Results showed that the average values of 12 PTEs in topsoil were higher than the Hainan soil geochemical baseline,showing different degrees of PTEs accumulation effect.The concentration of PTEs in the topsoil was lower than those in the subsoil except for Cd and Hg.The I_(geo)revealed that the major accumulated element in soils was As followed by Mo.Source apportionment suggested that parent materials and agricultural practices were the dominant factors for PTEs accumulation in the topsoil.Noncarcinogenic risks of soil samples from five land-use patterns presented a trend of paddy field>dry field>woodland>orchard>garden plot.However,the HQ values of 12 PTEs were less than the recommended limit of HQ=1,representing that there are no non-carcinogenic risks of PTEs for children and adults in the study area.The TR values are within 6.95×10^(-6)-1.38×10^(-5),which corresponds to the low level.Therefore the PTEs in the agricultural soil of the study area show little influence on the health status of the local population.
基金Project(41171361) supported by the National Natural Science Foundation of China
文摘The risk assessment right from the source of emissions can effectively guide the pollution control. A model was established, consisting of four part： source estimation, environmental fate analysis, exposure analysis and risk assessment. The human health risk, ecological risk and total risk of lead emissions were assessed. The factors were estimated to indicate the environmental decrease and exposure probability. Of all the 1887 t emissions in China in 2010（quantified in the previous work）, it is turned out 1.3 t reached human bodies（0.9 mg/ca）, and 2.7 t reached the ecosystem. Lead mainly came from the Use stage for the source while lead causing risk mainly came from the Waste Management Recycling and Production stages. As for chemical forms, PbO contributed most to the human health risk and PbSO_4 contributed most to the ecological risk. PbSO_4, PbO and Pb altogether contributed 71% to the total risk, indicating these three chemicals should be taken priority for the risk management.
基金Supported by Investigation on Fishery Resources and Environment in Key Waters of TibetSpecial Scientific Research Projects of Public Welfare Industry(Agriculture)(201503108)
文摘The occurrence and accumulation of total mercury (T-Hg) in sediments collected from the Yarlung Zangbo River (YLZB),the Lhasa River,the Niyang River and the Palongzangbu River were analyzed and the soil samples simultaneously collected from the bank were employed as control.Meanwhile,pollution status and potential ecological risk of Hg were calculated and assessed using index of geoaccumulation ( I geo ) and potential ecological risk assessment method (Er) in this study.The results showed that the T-Hg concentrations in sediments at eight sections of YLZB ranged from 4.23 to 48.1 μg/kg with mean concentration of 25.1 μg/kg,which was higher than background Hg value of soils in Tibet.T-Hg concentrations in sediments at three typical segments of YLZB were all significantly higher than those in soils collected from its bank (P<0.05).The Igeo and E r indexes revealed that the T-Hg pollution levels were slight pollution in two sections and moderate ecological risk in six sections of YLZB.Hg pollution risks also existed in the sediments of partial sections of the Lhasa River and the Niyang River,and slightly moderate Hg contamination with high ecological risk was presented in Lhasa urban district.The level of Hg in sediments of YLZB showed a notable spatial distribution characteristic with a trend of increasing firstly and then declining.Human activities played an important role in increasing Hg content in sediments of the river.
文摘目的:采用Logistic回归分析和ROC曲线评估步态运动学特征联合MRI总负荷对脑小血管病(cerebral small vessel disease,CSVD)步态障碍患者跌倒风险的预测价值。方法:选取2019年3月1日—2020年3月30日就诊于甘肃省人民医院中法神经康复科诊断为CSVD且以步态障碍为主要症状的43例患者为研究对象,统计临床数据,根据TUG测试时间将所有患者分为高跌倒风险(high risk of falling,HRF;TUG时间≥15s)组和低跌倒风险(low risk of falling,LRF;TUG时间<15s)组,采用Logistic回归分析和ROC曲线评估步态运动学特征联合MRI总负荷对CSVD步态障碍患者跌倒风险的预测价值。结果:研究共纳入43例患者,平均年龄(71.07±8.17)岁。其中女性26例(60.4%),高血压患者30例(69.8%),Logistic回归分析显示,在校正年龄和TUG后,步长(OR 0.821,95%CI 0.702—0.959,P=0.013)为CSVD步态障碍患者跌倒风险的独立保护因素,MRI总负荷(OR 4.217,95%CI 1.444—12.317,P=0.009)为CSVD步态障碍患者跌倒风险的独立危险因素。ROC曲线分析显示步长和MRI总负荷联合对CSVD步态障碍患者的跌倒风险具有较高的预测价值(AUC=0.904),敏感性为82.6%,特异性为90%。结论:步长联合MRI总负荷对CSVD步态障碍患者的跌倒风险有较高的预测价值。
