Chemical characteristics and ^|^delta;34S^|^ndash;SO42^|^minus; of acid rain: Anthropogenic sulfate deposition and its impacts on CO2 consumption in the rural karst area of southwest China

Ding, Hu; Lang, Yunchao; Liu, Cong‐Qiang; Liu, Tao-Ze

doi:10.2343/geochemj.2.0293

Cited by 22 publications

(9 citation statements)

References 32 publications

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“…Among all the 43 field stations, only about one fifth of the sites had average pH <5.6 (representing acid rain). Through a review of previous studies (Table ), we obtained 20 records of precipitation pH reported in China, where the data were mainly monitored at urban or suburban stations [ Wang , ; Chen , 2005; Tu et al ., ; Zheng , 2006; Huang et al ., ; Niu et al ., ; Zhao et al ., ; Zhou , 2011; Wang et al ., ; Ding et al ., ; Ou yang et al ., ; Xu et al ., ]. The average pH of these collective data was 5.46 with more than half the values <5.6; the lowest pH was 3.94, which might indicate serious acid precipitation.…”

Section: Discussionmentioning

confidence: 99%

Wet acid deposition in Chinese natural and agricultural ecosystems: Evidence from national‐scale monitoring

Wang

et al. 2016

JGR Atmospheres

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Acid deposition in precipitation has received widespread attention. However, it is necessary to monitor the acid deposition in Chinese agricultural and natural ecosystems because data derived from traditional urban/suburban observations might overestimate it to some extent. In this study, we continuously measured the acid deposition through precipitation (pH, sulfate (SO 4 2À ), and nitrate (NO 3 À )) in 43 field stations from 2009 to 2014 to explore the spatial patterns and the main influencing factors of acid deposition in Chinese agricultural and natural ecosystems. The results showed that the average precipitation pH at the 43 stations varied between 4.10 and 8.25 (average: 6.2) with nearly 20% of the observation sites being subjected to acid precipitation (pH < 5.6). The average deposition of SO 4 2À and NO 3 À was 115.99 and 32.93 kg ha À1 yr À1 , respectively. An apparent regional difference of acid deposition in Chinese agricultural and natural ecosystems was observed, which was most serious in south and central China and less serious in northwest China, Inner Mongolia, and Qinghai-Tibet. The level of economic development and amount of precipitation could explain most of the spatial variations of pH, SO 4 2À , and NO 3 À depositions. It is anticipated that acid deposition might increase further, although the current level of acid deposition in these Chinese agricultural and natural ecosystems was found to be less serious than projected from urban/suburban data. The control of energy consumption should be strengthened in future to prevent an increase of acid deposition in China.

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Section: Discussionmentioning

confidence: 99%

Wet acid deposition in Chinese natural and agricultural ecosystems: Evidence from national‐scale monitoring

Wang

et al. 2016

JGR Atmospheres

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“…A short-term study on the chemical composition of rainwater in Singapore revealed acidic rain water with pH of 4.2 and concentrations of major cations, sulfate, and ammonium ion varied monthly. A study of rainwater chemistry in Huanjiang China revealed a high concentration of SO 2À 4 , Ca 2+ , and NH þ 4 derived from sea salt, Na + , Cl − , Ca 2+ , and Mg 2+ from earth crust, and SO 2À 4 and NO À 3 from industrial and vehicle emissions [123]. Spatial and temporal variations in chemical components of rainwater were studied; nitrate and sulfate were the predominant anions which are much associated with metallic cations than hydrogen ions [124].…”

Section: Water Consumption In Malaysiamentioning

confidence: 99%

Evaluation of water quality variation in lakes, rivers, and ex-mining ponds in Malaysia (review)

Low

Koki

Juahir

et al. 2016

Desalination and Water Treatment

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A B S T R A C TThreat posed by the heavy metals has been increasing globally rendering many water bodies unfit for human consumption. This could be due to the increase in concentrations of these metals above natural background. This article reviews the literature data on variation of water quality in rivers, lakes, and ex-mining ponds in Malaysia and other selected countries. World Health Organization (WHO), United States Environmental Protection Agency, and Malaysian water quality standards (INWQS) are used as the baseline for the pollution and health risk assessments. It illustrates that concentrations of Pb, Cd, and As in lakes and ex-mining ponds, and Mn, Cd and Pb in rivers exceed permissible limits for direct consumption. The levels of dissolved oxygen, TSS, and chemical oxygen demand (COD) are not within WHO and INWQS limits, pH of lakes and ex-mining ponds are lower than reference standards while that of rivers are high. Principal component analysis reveals that TSS, COD, BOD, Pb, and As are highly associated with ex-mining ponds. Cluster analysis shows similarity in pollution source between lake and ex-mining ponds. Risk assessment revealed that high chronic daily intake and metal index were beyond acceptable limit indicating high risk and exposure to toxic metals.

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“…Carbonate dissolution can also be carried out by chemical agents other than carbonic acid. Anthropic disturbances such as agricultural practices using N-fertilizers [66][67][68], atmospheric deposition from long-distance sources of air pollution [69][70][71][72] and acid mine drainage [73,74], are potential sources of sulfuric and nitric acids that can add to or substitute carbonic acid in carbonate dissolution process. Likewise, there are also natural sources of sulfuric acid from volcanoes and hot springs as well as sulfur minerals in soils and sediments [75,76].…”

Section: Introductionmentioning

confidence: 99%

A Forty-Year Karstic Critical Zone Survey (Baget Catchment, Pyrenees-France): Lithologic and Hydroclimatic Controls on Seasonal and Inter-Annual Variations of Stream Water Chemical Composition, pCO2, and Carbonate Equilibrium

Ulloa-Cedamanos

Probst

Binet

et al. 2020

Water

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The long-term trends and seasonal patterns of stream water chemical composition in a small remote forested karst catchment, were investigated from 1978 to 2018. Calcium, magnesium, and bicarbonates, the dominant ions, increased over the period together with temperature, while sulfates decreased. Carbonate and sulfate mineral dissolution was the main source of these elements. These trends and the seasonal opposite patterns of discharge vs. temperature, calcite saturation index vs. pCO2 and bicarbonate vs. sulfates, suggested the influence of discharge, of reduced long-range atmospheric pollution, and of increasing air temperature on biological activity and carbonate dissolution. Furthermore, the hydrological regime controlled the seasonal stream water chemical composition and fluxes by: (i) a dilution during the high discharge period, (ii) a change in the contribution rate of the waters draining different lithological areas in the catchment, e.g., the increased sulfates to bicarbonates ratio during summer low flows, with a maximum alkalinity decrease of 24%, and (iii) a “piston” and a “flushing” effects of dissolved elements stored in soils and epikarst with the first autumn heavy rains. Long-term stream water hydrochemical surveys of karst system have proved to be powerful indicators of biogeochemical processes, water sources and pathways under variable natural and anthropogenic environmental pressure conditions.

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Chemical characteristics and ^|^delta;34S^|^ndash;SO42^|^minus; of acid rain: Anthropogenic sulfate deposition and its impacts on CO2 consumption in the rural karst area of southwest China

Cited by 22 publications

References 32 publications

Wet acid deposition in Chinese natural and agricultural ecosystems: Evidence from national‐scale monitoring

Wet acid deposition in Chinese natural and agricultural ecosystems: Evidence from national‐scale monitoring

Evaluation of water quality variation in lakes, rivers, and ex-mining ponds in Malaysia (review)

A Forty-Year Karstic Critical Zone Survey (Baget Catchment, Pyrenees-France): Lithologic and Hydroclimatic Controls on Seasonal and Inter-Annual Variations of Stream Water Chemical Composition, pCO2, and Carbonate Equilibrium

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