5 results on '"Gu, Yan-Qing"'
Search Results
2. Heavy Metals Accumulation Characteristics of Vegetables in Hangzhou City, China
- Author
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GU Yan-qing, GU You-li, BAI Qian, GONG Meng-dan, and ZHU Wei-qin
- Subjects
vegetables ,lcsh:GE1-350 ,bioconcentration factor ,heavy metal ,lcsh:Agriculture (General) ,lcsh:S1-972 ,lcsh:Environmental sciences - Abstract
A field survey of heavy metal concentrations in soils and vegetables grown in 30 vegetable farmlands of Hangzhou City were carried out. Through calculating the bioconcentration factor(BCF)and transfer factor(TF)for different heavy metals(Cu, Zn, Cd, Cr and Pb)in 27 kinds of different vegetables which belong to leafy vegetables, root vegetables or eggplant fruit vegetables, assessing their accumulation characteristics of heavy metals according to the differences of the bio-concentration factor, the reasonable proposals were put forward to optimize the planting structure of vegetables in mild and middle-level heavy metal contamination soils. The experimental results were as follows: In soils with mild and middle-level heavy metal contamination, leafy vegetables, such as crown daisy, cabbage, celery and Chinese long cabbage, had relatively low enrichment ability of heavy metals, so as the root and fruit vegetables like white radish, carrot, tomatoes, hence these vegetables could be planted preferentially. In contrast, some kinds of vegetables, including white amaranth, red amaranth, tatsoi, broccoli, gynura, brassica juncea and lettuce of leafy vegetables, lactuca sativa, taro, red radish and cherry radish of rhizome vegetables and sweet pepper of fruit vegetables, had relatively high accumulation ability of heavy metal, which should be avoided to be planted in soils with mild and middle-level heavy metal contamination.
- Published
- 2015
3. Cost-effectiveness analysis of neonatal hearing screening program in china: should universal screening be prioritized?
- Author
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Huang Li-Hui, Zhang Luo, Tobe Ruo-Yan, Qi Fang-Hua, Sun Long, Teng Yue, Ke Qing-Lin, Mai Fei, Zhang Xue-Feng, Zhang Mei, Yang Ru-Lan, Tu Lin, Li Hong-Hui, Gu Yan-Qing, Xu Sai-Nan, Yue Xiao-Yan, Li Xiao-Dong, Qi Bei-Er, Cheng Xiao-Huan, Tang Wei, Xu Ling-Zhong, and Han De-Min
- Subjects
Public aspects of medicine ,RA1-1270 - Abstract
Abstract Background Neonatal hearing screening (NHS) has been routinely offered as a vital component of early childhood care in developed countries, whereas such a screening program is still at the pilot or preliminary stage as regards its nationwide implementation in developing countries. To provide significant evidence for health policy making in China, this study aims to determine the cost-effectiveness of NHS program implementation in case of eight provinces of China. Methods A cost-effectiveness model was conducted and all neonates annually born from 2007 to 2009 in eight provinces of China were simulated in this model. The model parameters were estimated from the established databases in the general hospitals or maternal and child health hospitals of these eight provinces, supplemented from the published literature. The model estimated changes in program implementation costs, disability-adjusted life years (DALYs), average cost-effectiveness ratio (ACER), and incremental cost-effectiveness ratio (ICER) for universal screening compared to targeted screening in eight provinces. Results and discussion A multivariate sensitivity analysis was performed to determine uncertainty in health effect estimates and cost-effectiveness ratios using a probabilistic modeling technique. Targeted strategy trended to be cost-effective in Guangxi, Jiangxi, Henan, Guangdong, Zhejiang, Hebei, Shandong, and Beijing from the level of 9%, 9%, 8%, 4%, 3%, 7%, 5%, and 2%, respectively; while universal strategy trended to be cost-effective in those provinces from the level of 70%, 70%, 48%, 10%, 8%, 28%, 15%, 4%, respectively. This study showed although there was a huge disparity in the implementation of the NHS program in the surveyed provinces, both universal strategy and targeted strategy showed cost-effectiveness in those relatively developed provinces, while neither of the screening strategy showed cost-effectiveness in those relatively developing provinces. This study also showed that both strategies especially universal strategy achieve a good economic effect in the long term costs. Conclusions Universal screening might be considered as the prioritized implementation goal especially in those relatively developed provinces of China as it provides the best health and economic effects, while targeted screening might be temporarily more realistic than universal screening in those relatively developing provinces of China.
- Published
- 2012
- Full Text
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4. Direct spectrophotometric determination of iron in non-ferrous alloys
- Author
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Zhou Nan, Gu Yan Qing, Gu Yuan-Xiang, Yao Xu-zhang, and Lu Zhi-Ren
- Subjects
Chemistry ,Coefficient of variation ,Metallurgy ,High selectivity ,Metal analysis ,Ascorbic acid ,Mass spectrometry ,Analytical Chemistry ,Ferrous ,visual_art ,Aluminium alloy ,visual_art.visual_art_medium ,Quantitative analysis (chemistry) ,Nuclear chemistry - Abstract
Disodium 3-(2-pyridyl)-1,2,4-triazine-5,6-di(4′-phenylsulphonate) is used for determination of iron in metal analysis. High selectivity is achieved by using a ligand buffer and substoichiometric masking. Interference from ⩽ 0.9 mg of Cu(II) can be completely eliminated by combined reduction and masking with ascorbic acid and thiosemicarbazide. Beer's law is obeyed over the range 0.4–1.6 μg/ml iron in the final solution, with a standard deviation of 0.02 μg/ml. The method has been successfully applied to determination of iron (without preseparation) in a number of non-ferrous metals and alloys, with a coefficient of variation of 1.2–5.0%.
- Published
- 1989
5. [Evaluation on Heavy Metal Pollution and Its Risk in Soils from Vegetable Bases of Hangzhou].
- Author
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Gong MD, Zhu WQ, Gu YQ, Li SY, Jiana T, and Tuni K
- Subjects
- Agriculture, China, Risk Assessment, Soil chemistry, Vegetables, Environmental Monitoring, Farms, Metals, Heavy analysis, Soil Pollutants analysis
- Abstract
With the purpose of investigation on heavy metal contamination in soils from vegetable bases of Hangzhou, adopting field investigation and indoor analysis methods, the contents of heavy metals as Cu, Zn, Pb, Cd, Cr, As and Ni, together with their relevance to the physicochemical properties of the 203 soils from 30 vegetable bases in 10 districts of Hangzhou were studied. The results showed that the contents of heavy metals such as Zn,Cr,As,Ni generally didn't exceed the standard, while the contents of heavy metals such as Cu, Pb, Cd exceeded it. The results from synthetic pollution evaluation showed that the soils were slightly polluted in soils from vegetable bases of Hangzhou, which were mainly caused by Cd pollution. Furthermore, there was slight potential ecological hazard for Cu, Zn, Pb, Cr, As and Ni but strong potential ecological hazard for Cd, and medium comprehensive ecological hazard as a whole for all the heavy metals in soils from vegetable bases of Hangzhou. The correlation analysis indicated that the contents of Cu, Zn, Pb, As, Cd were greatly influenced by the soil physicochemical property. Thus, measures must be taken for the prevention and controlling of heavy metal pollution in the soils from vegetable bases in Hangzhou, especially for that of Cd.
- Published
- 2016
- Full Text
- View/download PDF
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