Mercury methylation in rice paddies and its possible controlling factors in the Hg mining area, Guizhou province, Southwest China

2016 ◽  
Vol 215 ◽  
pp. 1-9 ◽  
Author(s):  
Lei Zhao ◽  
Guangle Qiu ◽  
Christopher W.N. Anderson ◽  
Bo Meng ◽  
Dingyong Wang ◽  
...  
Keyword(s):  
Southwest China ◽  
Mining Area ◽  
Controlling Factors ◽  
Guizhou Province ◽  
Mercury Methylation ◽  
Rice Paddies ◽  
Hg Mining

scholarly journals Spatial distribution of mercury deposition fluxes in Wanshan Hg mining area, Guizhou province, China

2012 ◽  
Vol 12 (14) ◽  
pp. 6207-6218 ◽  
Author(s):  
Z. H. Dai ◽  
X. B. Feng ◽  
J. Sommar ◽  
P. Li ◽  
X. W. Fu
Keyword(s):  
Spatial Distribution ◽  
Dry Deposition ◽  
Wet Deposition ◽  
Ambient Air ◽  
Mining Area ◽  
Atmospheric Mercury ◽  
Guizhou Province ◽  
Mining Activities ◽  
Deposition Fluxes ◽  
Hg Mining

Abstract. The legacy of long-term mining activities in Wanshan mercury (Hg) mining area (WMMA), Guizhou, China including a series of environmental issues related to Hg pollution. The spatial distribution of gaseous elemental mercury (Hg0) concentrations in ambient air were monitored using a mobile RA-915+ Zeeman Mercury Analyzer during daytime and night time in May 2010. The data imply that calcines and mine wastes piles located at Dashuixi and on-going artisanal Hg mining activities at Supeng were major sources of atmospheric mercury in WMMA. For a full year (May 2010 to May 2011), sampling of precipitation and throughfall were conducted on a weekly basis at three sites (Shenchong, Dashuixi, and Supeng) within WMMA. Hg in deposition was characterized by analysis of total Hg (THg) and dissolved Hg (DHg) concentrations. The corresponding data exhibit a high degree of variability, both temporarily and spatially. The volume-weighted mean THg concentrations in precipitation and throughfall samples were 502.6 ng l−1 and 977.8 ng l−1 at Shenchong, 814.1 ng l−1and 3392.1 ng l−1 at Dashuixi, 7490.1 ng l−1and 9641.5 ng l−1 at Supeng, respectively. THg was enhanced in throughfall compared to wet deposition samples by up to a factor of 7. The annual wet Hg deposition fluxes were 29.1, 68.8 and 593.1 μg m−2 yr−1 at Shenchong, Dashuixi and Supeng, respectively, while the annual dry Hg deposition fluxes were estimated to be 378.9, 2613.6 and 6178 μg m−2 yr−1 at these sites, respectively. Dry deposition played a dominant role in total atmospheric Hg deposition in WMMA since the dry deposition fluxes were 10.4–37.9 times higher than the wet deposition fluxes during the whole sample period. Our data showed that air deposition was still an important pathway of Hg contamination to the local environment in WMMA.

Methylmercury in rice (Oryza sativa L.) grown from the Xunyang Hg mining area, Shaanxi province, northwestern China

2011 ◽  
Vol 84 (2) ◽  
pp. 281-289 ◽  
Author(s):  
Guangle Qiu ◽  
Xinbin Feng ◽  
Bo Meng ◽  
Xun Wang
Keyword(s):  
Oryza Sativa ◽  
Oryza Sativa L ◽  
Ambient Air ◽  
Mining Area ◽  
Northwestern China ◽  
Guizhou Province ◽  
Shaanxi Province ◽  
Mass Balance Calculation ◽  
Polished Rice ◽  
Hg Mining

Mercury (Hg) is a global pollutant and can transform into methylmercury (MeHg), a highly toxic and bioaccumulative organic form. Recent surveys showed that rice (Oryza sativa L.) rather than fish is the main source of human MeHg exposure in Hg mining and retorting regions in Guizhou province, southwestern China, where rice is a traditional staple food. Here we report that MeHg in rice grown at an active Hg mining and retorting region in Shaanxi province, northwestern China, characterized with different climate compared to Guizhou, contained levels up to 240 μg kg–1 MeHg in bran, 78 μg kg–1 MeHg in polished rice, and 30 μg kg–1 MeHg in hull, respectively. Although the polishing process may reduce MeHg content, the mass balance calculation showed that greater than 50 % of total MeHg mass can be observed in white rice (polished rice). The ongoing Hg retorting activities, which account for the high levels of ambient air Hg, result in high levels of MeHg in rice grains. Our results further demonstrate that the accumulation of MeHg is a common feature of rice.

scholarly journals Mercury accumulation in vegetable Houttuynia cordata Thunb. from two different geological areas in southwest China and implications for human consumption

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Qingfeng Wang ◽  
Zhonggen Li ◽  
Xinbin Feng ◽  
Ao Wang ◽  
Xinyu Li ◽  
...  
Keyword(s):  
Southwest China ◽  
Dietary Habits ◽  
Mining Area ◽  
Human Consumption ◽  
Mehg Exposure ◽  
Exposure Risk ◽  
Houttuynia Cordata ◽  
Mining Areas ◽  
Houttuynia Cordata Thunb ◽  
Hg Mining

AbstractHouttuynia cordata Thunb. (HCT) is a common vegetable native to southwest China, and grown for consumption. The results suggested that THg contents in all parts and MeHg in underground parts of HCT in Hg mining areas were much higher than those in non-Hg mining areas. The highest THg and MeHg content of HCT were found in the roots, followed by the other tissues in the sequence: roots > leaves > rhizomes > aboveground stems (THg), and roots > rhizomes > aboveground stems > leaves (MeHg). The average THg bioaccumulation factor (BCF) of HCT root in the Hg mining area and in non-Hg mining areas could reach 1.02 ± 0.71 and 0.99 ± 0.71 respectively, indicating that HCT is a Hg accumulator. And the THg and MeHg contents in all tissues of HCT, including the leaves, were significantly correlated with THg and MeHg content in the soil. Additionally, preferred dietary habits of HCT consumption could directly affect the Hg exposure risk. Consuming the aboveground parts (CAP) of HCT potentially poses a high THg exposure risk and consuming the underground parts (CUP) may lead to a relatively high MeHg exposure risk. Only consuming the rhizomes (OCR) of the underground parts could significantly reduce the exposure risk of THg and to some extent of MeHg. In summary, HCT should not be cultivated near the Hg contaminated sites, such as Hg tailings, as it is associated with a greater risk of Hg exposure and high root Hg levels, and the roots should be removed before consumption to reduce the Hg risk.

scholarly journals Analysis and Prediction of “AI + Education” Attention Based on Baidu Index—Taking Guizhou Province as an Example

2021 ◽  
Vol 13 (5) ◽  
pp. 120
Author(s):  
Yulin Zhao ◽  
Junke Li ◽  
Jiang-E Wang
Keyword(s):  
Artificial Intelligence ◽  
Southwest China ◽  
Arima Model ◽  
Modern Technology ◽  
Guizhou Province ◽  
Western Region ◽  
Elastic Coefficient ◽  
The Sustainable Development ◽  
Intelligence Education ◽  
Coefficient Method

Studying the attention of “artificial intelligence + education” in ethnic areas is of great significance for China for promoting the integrated development of new educational modes and modern technology in the western region. Guizhou province is an area inhabited by ethnic minorities, located in the heart of Southwest China. The development of its intelligent education has strong enlightenment for the whole country and the region. Therefore, this paper selects the Baidu Index of “artificial intelligence (AI) + education” in Guizhou province from 2013 to 2020, analyzes the spatial–temporal characteristics of its network attention by using the elastic coefficient method, and builds the ARIMA model on this basis to predict future development. The results show that the public’s attention to “AI + education” differs significantly in time and space. Then, according to the prediction results, this paper puts forward relevant suggestions for the country to promote the sustainable development of education in western ethnic areas.

scholarly journals Long-range effect of cyanide on mercury methylation in a gold mining area in southern Ecuador

2011 ◽  
Vol 409 (23) ◽  
pp. 5026-5033 ◽  
Author(s):  
Jean Remy Davée Guimaraes ◽  
Oscar Betancourt ◽  
Marcio Rodrigues Miranda ◽  
Ramiro Barriga ◽  
Edwin Cueva ◽  
...  
Keyword(s):  
Long Range ◽  
Gold Mining ◽  
Mining Area ◽  
Mercury Methylation ◽  
Range Effect ◽  
Southern Ecuador

Research Paper DNA barcode identification of fish products from Guiyang markets in southwest China

2022 ◽  
Author(s):  
Qian Tang ◽  
Qi Luo ◽  
Qian Duan ◽  
Lei Deng ◽  
Renyi Zhang
Keyword(s):  
Dna Barcoding ◽  
Molecular Identification ◽  
Fish Consumption ◽  
Southwest China ◽  
Dna Barcode ◽  
Guizhou Province ◽  
Accurate Identification ◽  
Continuous Growth ◽  
Fish Products ◽  
Fresh Frozen

Nowadays, the global fish consumption continues to rise along with the continuous growth of the population, which has led to the dilemma of overfishing of fishery resources. Especially high-value fish that are overfished are often replaced by other fish. Therefore, the accurate identification of fish products in the market is a problem worthy of attention. In this study, full-DNA barcoding (FDB) and mini-DNA barcoding (MDB) used to detect the fraud of fish products in Guiyang, Guizhou province in China. The molecular identification results showed that 39 of the 191 samples were not consistent with the labels. The mislabelling of fish products for fresh, frozen, cooked and canned were 11.70%, 20.00%, 34.09% and 50.00%, respectively. The average kimura 2 parameter distances of MDB within species and genera were 0.27% and 5.41%, respectively; while average distances of FDB were 0.17% within species and 6.17% within genera. In this study, commercial fraud is noticeable, most of the high-priced fish were replaced of low-priced fish with a similar feature. Our study indicated that DNA barcoding is a valid tool for the identification of fish products and that it allows an idea of conservation and monitoring efforts, while confirming the MDB as a reliable tool for fish products.

scholarly journals Mercury methylation in paddy soil: source and distribution of mercury species at a Hg mining area, Guizhou Province, China

2016 ◽  
Vol 13 (8) ◽  
pp. 2429-2440 ◽  
Author(s):  
Lei Zhao ◽  
Christopher W. N Anderson ◽  
Guangle Qiu ◽  
Bo Meng ◽  
Dingyong Wang ◽  
...  
Keyword(s):  
Paddy Soil ◽  
Surface Soil ◽  
Ambient Air ◽  
Rice Paddy ◽  
Guizhou Province ◽  
Mercury Species ◽  
Low Concentration ◽  
Paddy Water ◽  
Hg Mining

Abstract. Rice paddy plantation is the dominant agricultural land use throughout Asia. Rice paddy fields have been identified as important sites for methylmercury (MeHg) production in the terrestrial ecosystem and a primary pathway of MeHg exposure to humans in mercury (Hg) mining areas. We compared the source and distribution of Hg species in different compartments of the rice paddy during a complete rice-growing season at two different typical Hg-contaminated mining sites in Guizhou province, China: an abandoned site with a high Hg concentration in soil but a low concentration in the atmosphere and a current-day artisanal site with a low concentration in soil but a high concentration in the atmosphere. Our results showed that the flux of new Hg to the ecosystem from irrigation and atmospheric deposition was insignificant relative to the pool of old Hg in soil; the dominant source of MeHg to paddy soil is in situ methylation of inorganic Hg (IHg). Elevated MeHg concentrations and the high proportion of Hg as MeHg in paddy water and the surface soil layer at the artisanal site demonstrated active Hg methylation at this site only. We propose that the in situ production of MeHg in paddy water and surface soil is dependent on elevated Hg in the atmosphere and the consequential deposition of new Hg into a low-pH anoxic geochemical system. The absence of depth-dependent variability in the MeHg concentration in soil cores collected from the abandoned Hg mining site, consistent with the low concentration of Hg in the atmosphere and high pH of the paddy water and irrigation water, suggested that net production of MeHg at this site was limited. We propose that the concentration of Hg in ambient air is an indicator for the risk of MeHg accumulation in paddy rice.

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