News Updates on Acid Rain: February -2019

Mechanism of atomic number 92 unleash from uranium mill tailings beneath semipermanent exposure to simulated acid rain: Geochemical proof and environmental implication

To date, there’s not sufficient  data to totally perceive the incidence, transport and fate of residual U (U) from uranium mill tailings (UMT). Herein this study investigated completely different U unleash behaviors from natural UMT (without grinding) below four simulated air pollution (pH = 2.0–5.0) compared with controlled state of affairs (pH = 6.0) for twenty five weeks. The results showed that the foremost notable U unleash was discovered from UMTpH2.0, followed by UMTpH3.0 whereas a nonlinear relationship between pH scale and U unleash was discovered from UMTpH4.0–6.0. The divergence of U unleash behaviors was attributed to the presence of minerals like spar and clinochlore. Autunite, a secondary mineral shaped when natural process, would possibly regulate U unleash in UMTpH3.0–6.0. Fick theory model disclosed the shift of U unleash mechanism from surface dissolution to diffusion transport for UMTpH2.0, UMTpH3.0 and UMTpH5.0 at varied stage, whereas UMTpH4.0 and UMTpH6.0 displayed straightforward dissolution and diffusion mechanism, severally. This study highlights the need of playacting semipermanent natural process tests to find the “shift event” of leaching mechanics and to higher perceive the mechanism of U unleash influenced by geology of the natural UMT below simulated air pollution conditions, that is tributary to developing UMT management ways to attenuate the danger of U unleash and exposure. [1]

Effect of acid rain on economic loss of concrete structures in Hangzhou, China

Hangzhou is one amongst the foremost serious air pollution contaminated cities in China thanks to speedy economic development and increasing coal consumption. so as to review concrete erosion caused by air pollution and corresponding economic loss in Hangzhou, air pollution standing in Hangzhou was analyzed from 1983 to 2015, and concrete harm was field surveyed, then laboratory sulphate attack experiments were conducted beneath dry-wet sport supported the similar erosion intensity, after that, economic loss by air pollution on residential concrete structures in Hangzhou was calculable. The analysis shows that Hangzhou is moderate or robust erosion throughout the last thirty years. sulphate attack ends up in concrete loose and powdery, and concrete mass growth whereas cube strength of concrete decreases. The economic loss of air pollution pollution is over two million US$ each year in Hangzhou. it’s believed that air pollution management encompasses a good distance to travel in Hangzhou. [2]

Quantitative calculation for the contribution of acid rain to carbonate weathering

Carbonate weathering by greenhouse emission is taken into account to play a vital role within the international carbon cycle. In acid rain-affected areas, the carbon cycle may be compact by acid precipitation weathering. once previous studies have thought of all potential weathering processes together with H2SO4 in rain, sulphide chemical reaction and agricultural activities, this study projected a geochemical methodology to specifically calculate the extent of carbonate weathering by acid precipitation victimization hydrogeochemical information from karstic spring and rain. This methodology has thought of the H concentration and nitrification of NH4 in rain throughout recharge, and provided the higher limit of the weathering quantity. seasonal sampling for spring (wet and dry season) was conducted from a typical carbonate space in Jiaoshi, Chongqing, SW China, with annual rain hydrogen ion concentration values starting from three.94 to 4.70. the main hydrogeochemistry sorts of spring are HCO3–Ca and HCO3–Ca•Mg. the common proportion of carbonate weathering by acid precipitation is calculable to be 36 ± 15%. The quantitative geochemical methodology provided during this study is very important for understanding the hydrogeochemical processes in acid precipitation areas and for conniving greenhouse emission sources & sinks of carbonate weathering. [3]

 Greenland Ice Cores Show Industrial Record Of Acid Rain, Success Of U.S. Clean Air Act

The rise and fall of acid precipitation could be a international experiment whose results are preserved within the geological record.

By analyzing samples from the Gronland ice sheet, University of Washington part scientists found clear proof of the U.S. Clean Air Act. They conjointly discovered a link between air acidity and the way element is preserved in layers of snow, consistent with a paperpublished on within the Proceedings of the National Academy of Sciences.

Forty-five years past, acid precipitation was killing fish and dissolving stone monuments on the geographical region. pollution rose starting with the economic Revolution and commenced to boost once the U.S. Clean Air Act of 1970 needed coal power plants and different polluters to clean sulfur out of their smokestacks. [4]

Outdoor Air Quality and Acid Rains within Warri Refinery and Its Environs

The focus of the analysis was to assess the impact of the Warri works operations on the out of doors air quality at intervals the refinery and its geographic area. The Warri processing Associate in Nursingd organic compound Company (WRPC) is an industrial complicated of the African nation National fossil fuel Corporation (NNPC) downstream sector, settled between Ekpan and Ubeji communities of Delta state of African nation. out of doors air quality at intervals the works, Ubeji and Ekpan communities were checked for the concentration of element sulfide, dioxide, toluene, benzine and perchloroethylene. The results from the study disclosed the presence of benzine, dissolver and element sulfide at intervals the out of doors air of the works and its geographic area in virtually constant concentrations. However, these gases/vapours are gift in concentrations below the Federal Environmental Protection Agency (FEPA) listed limits. Also, rain water samples from at intervals the works, Ubeji and Ekpan communities were collected for 3 consecutive years throughout the descending season and therefore the water samples checked for acidity. there have been complaints by some residents of the geographic area regarding frequent eye irritation that they link to the rather significant gaseous  emissions. The results from the study conjointly additional underscores the requirement for continuous observation of outside air quality particularly in settlements and rural communities bordering areas with high industrial activities. [5]

Reference

[1] Yin M, Sun J, Chen Y, Wang J, Shang J, Belshaw N, Shen C, Liu J, Li H, Linghu W, Xiao T. Mechanism of uranium release from uranium mill tailings under long-term exposure to simulated acid rain: Geochemical evidence and environmental implication. Environmental Pollution. 2019 Jan 1;244:174-81. (web link)

[2] Zhang Y, Gu L, Li W, Zhang Q. Effect of acid rain on economic loss of concrete structures in Hangzhou, China. International Journal of Low-Carbon Technologies. 2019 Jan 31. (web link)

[3] Huang T, Fan Y, Long Y, Pang Z. Quantitative calculation for the contribution of acid rain to carbonate weathering. Journal of Hydrology. 2019 Jan 1;568:360-71. (web link)

[4] Greenland Ice Cores Show Industrial Record Of Acid Rain, Success Of U.S. Clean Air Act

April 13, 2014 (web link)

[5] Outdoor Air Quality and Acid Rains within Warri Refinery and Its Environs

U. E. Amuho

Department of Chemistry, Adeyemi College of Education, Ondo, Nigeria

I. A. Amoo

Department of Chemistry, Federal University of Technology, Akure, Nigeri

O. O. Ajayi

Department of Chemistry, Federal University of Technology, Akure, Nigeri

A. F. Aiyesanmi

Department of Chemistry, Federal University of Technology, Akure, Nigeria

T. A. Akinnifesi

Department of Chemistry, Adekunle Ajasin University, Akungba-Akoko, Nigeria

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