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OBJECTIVE:To establish the method for simultaneous determination of heavy metals in Platycodon grandiflorus, and to explore the effects of altitude on the contents of heavy metals. METHODS:The contents of As,Hg,Pb,Cu and Cd were determined by hydride generation,hydride generation method,graphite furnace method,flame spectrometry,graphite furnace meth-od. SPSS 19.0 software was adopted for clustering analysis and correlation analysis. RESULTS:The linear ranges of As,Hg,Pb, Cu and Cd were 0-16 μg/L(r=0.9960),0-18 μg/L(r=0.9996),0-50 μg/L(r=0.9997),0-0.8 μg/L(r=0.9990)and 0-4 μg/L (r=0.9980). Detection limit were 1.3×10-3,2.4×10-4,1.9×10-3,0.33,1.8×10-4 mg/kg. Quantitation limit were 4.4×10-3,8.0×10-4, 6.2 × 10-3,1.1,6.0 × 10-3 mg/kg. RSDs of precision,stability and repeatability tests were all lower than 3.0%. Recoveries were 99.1%-107.1%(RSD=3.13%,n=6),94.1%-100.5%(RSD=2.36%,n=6),98.9%-104.8%(RSD=1.81%,n=6),92.7%-100.3%(RSD=2.92%,n=6),96.6%-99.9%(RSD=1.26%,n=6). Samples with similar altitudes were clustered into a class;the con-tents of heavy metals decreased as the increase of altitude;there was significant correlation among 5 heavy metals. CONCLU-SIONS:The method is simple,precise,stable and repeatable,and can be used for simultaneous determination of heavy metals' contents in P. grandiflorus. The altitude has a certain effect on the quality of P. grandiflorus.
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This article believed that natural medicine resources in the Three Gorges Reservoir Area are abundant and with modern industrialization development basis through analysis of condition, distribution features and development prospect of natural medicine resources. It argued that natural medicine resources can be the industry with the most sustainable development potential in the Three Gorges Reservoir Area and the efficient path to solve industrial hollowing and surplus labors after immigrants of the area, which can greatly improve and optimize environment of the area. It proposed that the development of natural medicine resources should be closely combined with strong pharmaceutical enterprises;innovation and research centers for natural medicine resources in the area should be established;professional wholesale markets should be built;strong varieties should be developed;standardized quality control system should be set up. All the above mentioned are with the purpose to promote industry standardization and science, and provide references for government rational development and utilization of natural medicine resources.
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Objective To investigate the status of psychosomatic health on the aged in reservoir area of three gorges .Study men-tal sub-health population distribution and the related influencing factors of the aged .Methods 604 elderly of reservoir area of three gorges were investigated by using self-made general questionnaire ,Cornell Medical Index(CMI) ,Eysenck Personality Questionnaire-R Short Scale(EPQ-RSC) ,Social Support Rating Scale(SSRS) ,Activities of daily living (ADL) ,Memorial University of Newfound-land Scale of Happiness(MUNSH) .Results 14 .7% aged′s mental health was in the sub-healthy status .Older age ,low education level ,no spouse ,urban elderly people were higher in mental sub-healthy .There was significant difference between mental sub-healthy group and mental healthy group in the aspect of personality 、social support、subjective well-being、activities of daily living (P<0 .05) .Conclusion The elderly psychosomatic health status of the Three Gorges Reservoir area is good ,with low incidence of mental sub-health ,their psychosomatic health more affected by the state of mind .
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Objective To understand the changes of schistosomiasis endemic situation in Sichuan Province,the upstream of Yangtze River basin,and the impact on schistosomiasis transmission in Three Gorges Reservoir area after the construction of Three Gorges Reservoir. Methods The annual reports of the schistosomiasis endemic situation in Sichuan Province from 2000-2012,the data of the schistosomiasis surveillance sites in Sichuan Province from 2001-2012,the data of the schistosomiasis sampling survey in Sichuan Province in 2001,and the relevant reference of Three Gorges Reservoir were collected. The schisto-somiasis prevalence in human and cattle,and Oncomelania hupensis snail status were investigated. The snail survey was imple-mented in Qianjin Village,Jianyang City,Sichuan Province,the nearest village to Three Gorges Reservoir Area. Results The schistosomiasis endemic situation presented a continuous declining state in Sichuan Province from 2000-2012,and reached the criteria of schistosomiasis transmission controlled in 2008. From 2012,65.07%of endemic counties reached the criteria of schis-tosomiasis transmission interrupted. From 2006,no schistosome infected snails were found. In Qianjin Village,1714 m2 environ-ments were surveyed and no snails were found. Conclusions The schistosomiasis endemic area and snail area are significantly reduced in Sichuan Province,the upstream of Yangtze River basin,after the construction of Three Gorges Reservoir. Therefore, the possibility of schistosomiasis endemic diffusing to Three Gorges Reservoir area is minimum.
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Objective Characteristics and tendency of mosquito and major mosquito-borne diseases (including epidemic encephalitis B and malaria) were analyzed in the Three Gorges Reservoir Area from 1997 to 2008. Methods Information on surveillance data related to mosquito-borne infectious diseases and on mosquito density and category, from 1997 to 2008 was collected from Health Surveillance System in Three Gorges Reservoir Area. Data regarding meteorological factors and construction of Three Gorges Reservoir was also collected. Pearson and Poisson models were used. Results From 1997 to 2008, in the Three Gorges Reservoir Area, the incidence rates of epidemic encephalitis B and malaria were decreasing. Positive correlations were shown between indoor and outdoor mosquito density as well with temperature with coefficient as 0.281 and 0.355 respectively. Correlations of mosquito-borne diseases with indoor and outdoor mosquito density were positive, with correlation coefficient as 0.340 and 0.328 respectively. Conclusion There seemed lack of evidence to prove that negative influences had occurred on the incidence of mosquito-borne infectious diseases or the mosquito density after the Three Gorges Reservoir water storage came into being in 2003, however, long-time surveillance program needs to be carried out to gather information on this issue.
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0.05).Significant difference existed in the coliform qualification rate in the source water samples taken at various times (P0.05).However,significant difference existed in qualification rate of bacteria,fecal coliform,free chlorine residual (P