| total mercury, methylmercury and selenium in mercury polluted areas in the province guizhou, china. | the province of guizhou in southwestern china is currently one of the world's most important mercury production areas. emissions of mercury from the province to the global atmosphere have been estimated to be approximately 12% of the world total anthropogenic emissions. the main objective of this study was to assess the level of contamination with hg in two geographical areas of guizhou province. mercury pollution in the areas concerned originates from mercury mining and ore processing in the ar ... | 2003 | 12663187 |
| rice from mercury contaminated areas in guizhou province induces c-jun expression in rat brain. | mercury (hg), as one of the priority pollutants and also a hot topic of frontier environmental research in many countries, has been paid higher attention in the world since the middle of the last century. guizhou province (at n24 degrees 30'-29 degrees 13', e103 degrees 1'-109 degrees 30', 1 100 m above the sea level, with subtropical humid climate) in southwest china is an important mercury production center. it has been found that the mercury content in most media of aquatics, soil, atmosphere ... | 2005 | 16001828 |
| effects of mercury contaminated rice from typical chemical plant area in china on nitric oxide changes and c-fos expression of rats brain. | china is one of countries with the highest mercury production in the world. the guizhou province in southwestern china is currently one of the world's most important mercury production areas. in order to study the neurotoxicity of rice from qingzhen chemical plant area and probe into the signal transduction molecular mechanism of injury in rat brain stimulation by mercury contaminated rice. the rats were exposed to mercury contaminated rice for 20 d. both of the measurements of no and nos were p ... | 2005 | 16295883 |
| environmental contamination of mercury from hg-mining areas in wuchuan, northeastern guizhou, china. | total hg and methyl-hg were evaluated in mine wastes, soils, water, and vegetations from the wuchuan hg-mining areas, guizhou, china. mine wastes contain high total hg concentrations, ranging from 79 to 710 microg g(-1), and methyl-hg from 0.32 to 3.9 ng g(-1). total hg in soil samples range from 0.33 to 320 microg g(-1) and methyl-hg from 0.69 to 20 ng g(-1). vegetations present a high average total hg concentration of 260 ng g(-1), which greatly exceeds the maximum hg concentration of 20 ng g( ... | 2006 | 16310915 |
| oxidative stress on domestic ducks (shaoxing duck) chronically exposed in a mercury-selenium coexisting mining area in china. | the wanshan mercury mine is the largest mercury deposit in guizhou province, china. few attempts have been made to study the toxic effects of mercury on biota in this mining area. this study was the first to investigate the oxidative stress on domestic ducks (shaoxing duck) chronically exposed to mercury in the wanshan mining area. chemical analyses revealed higher concentrations of both, mercury and selenium in samples from the wanshan area. total mercury and selenium concentrations in duck tis ... | 2006 | 16406582 |
| expression of c-fos and oxidative stress on brain of rats reared on food from mercury-selenium coexisting mining area. | wanshan mercury mine is the largest mercury deposit in guizhou province of china, but there were few reports on mercury toxic effect in the mining area. in order to study the neurotoxicity of food from wanshan mercury mine area and probe into the effect of food from wanshan mercury miner area on the changes of brain oxidative damage and expression of c-fos gene. the rats were exposed to mercury contaminated food for 20 d. the content of malondialdehyde (mda), superoxide dismutase (sod), gsh-pero ... | 2006 | 17078562 |
| mercury pollution in two typical areas in guizhou province, china and its neurotoxic effects in the brains of rats fed with local polluted rice. | guizhou province, which located in southwestern of china, is an important mercury (hg) production center. this study was to investigate the environmental levels and ecological effects of mercury in two typical hg polluted areas in guizhou province. in addition, to improve the understanding of the neurotoxic effects of hg, a rats based laboratory study was also carried out in this study. samples of water, soil, plants, crops and animals collected from wanshan mercury mine area, guzhou province, w ... | 2006 | 17120105 |
| [residue of pcbs and ocps in the paddy soil from hongfeng reservoir area, guizhou, china]. | distributions of seven pcbs (polychlorinated biphenyls) congeners and 13 ocps (organochlorinated pesticides) were investigated in paddy soil section in hongfeng reservoir area. the results showed that ddts and its metabolized compounds, isomer of hchs, endrin, heptachlor, pcb 28 and pcb 52 were detected in all soil samples. compared to the polluted area, the concentrations of pcbs were lower in study area, while the compositions of organic pollutants in soil samples were similar. the dominant co ... | 2007 | 17489179 |
| methylmercury accumulation in rice (oryza sativa l.) grown at abandoned mercury mines in guizhou, china. | mercury is a global pollutant that can transform into methylmercury, a highly toxic and bioaccumulative organic form. previous surveys have shown that fish is the main source of human methylmercury exposure, whereas most other food products have an average value below 20 microg/kg and primarily in the inorganic form. this paper reports that methylmercury in rice (oryza sativa l.) grown at abandoned mercury mining areas contained levels >100 microg/kg in its edible portion and proved to be 10-100 ... | 2008 | 18318492 |
| human exposure to methylmercury through rice intake in mercury mining areas, guizhou province, china. | the toxicity of methylmercury (me-hg) has caused widespread public human concern as a result of several widely publicized disasters. me-hg is highly toxic, and the nervous system is its principal target tissue for humans. although the general population is primarily exposed to me-hg through contaminated fish and marine mammals, in hg mining areas a long history of mining activities can produce serious hg pollution to the local environment in a study of 98 persons from the wanshan hg mining area, ... | 2008 | 18350916 |
| mercury exposure in the population from wuchuan mercury mining area, guizhou, china. | mercury (hg) exposure in the population from wuchuan mercury mining area (wmma), guizhou, china, was evaluated by human hair hg investigation. total gaseous mercury (tgm) in the ambient air and hg in rice were measured to assess human risk of hg exposure. high tgm concentrations in the ambient air were found near smelting workshop. rice not only contained high total mercury (t-hg) which ranged from 6.0-113 ng/g, but also contained highly elevated methylmercury (me-hg) which ranged from 3.1-13.4 ... | 2008 | 18367234 |
| mercury pollution in guizhou, southwestern china - an overview. | mercury (hg) is a global pollutant and poses a worldwide concern due to its high toxicity. guizhou province is recognized as a heavily hg-polluted area in china due to both the special geochemical background and human activities. here an integrated overview of current knowledge on the behavior of hg in environments, as well as human health risk with respect to hg contaminations in guizhou was presented. two key anthropogenic hg emission sources in guizhou were coal combustion and metals smelting ... | 2008 | 18617222 |
| assessing noxious effects of dietary exposure to methylmercury, pcbs and se coexisting in environmentally contaminated rice in male mice. | polychlorinated biphenyls and methylmercury are two of the most ubiquitous environmental contaminants in guizhou province. rice is eaten with almost every meal and provides more calories than any single food in guizhou province. the estimated tolerable daily intake of total mercury, mehg, se and pcbs from guizhou contaminated rice by chinese people showed that mehg and/or pcbs exceeded the corresponding limits. the aim of this study was to characterize the effects of exposure to environmental co ... | 2009 | 19167073 |
| accumulation of mercury and cadmium in rice from paddy soil near a mercury mine. | paddy soil and rice (oryza sativa l.) in the wanshan mining area in guizhou province, china, have been contaminated by toxic trace metals such as cadmium (cd) and mercury (hg). the present study examined correlations between the types and physicochemical parameters of the soil and the contents of trace metals and the different forms of hg in rice. the health risks of consuming contaminated rice from the wanshan mining area were also assessed. sequential extraction procedures were used to investi ... | 2014 | 25087518 |
| stable mercury isotope variation in rice plants (oryza sativa l.) from the wanshan mercury mining district, sw china. | to study the sources and transformations of hg in the rice plant ( oryza sativa l.), stable hg isotope variations in different tissues (foliage, root, stem, and seed) of rice which were collected from the wanshan mercury mine (wsmm, guizhou province, sw china) were investigated by multicollector inductively coupled plasma mass spectrometry (mc-icp-ms). in comparison, hg isotope compositions of paddy soil, lichen, and direct ambient air samples in wsmm were also analyzed. we observed that mass de ... | 2013 | 23363238 |
| environment and genotype controls on mercury accumulation in rice (oryza sativa l.) cultivated along a contamination gradient in guizhou, china. | accumulation of total hg (thg) and methylmercury (mehg) was investigated among 50 indica rice varieties cultivated in 3 sites in guizhou, china, classified as highly-contaminated, moderately-contaminated, and background sites. concentrations of soil and pore water (depth: 0-2 cm) thg and mehg were poor predictors of thg and mehg concentrations in polished white rice and bran, with significantly higher accumulation in the moderately-contaminated site compared to the other 2 sites (anova, p<0.0001 ... | 2012 | 22513403 |