The effects of weathering of coal-bearing stratum on the transport and transformation of DIC in karst watershed

Huang, Jiangxun; Li, Qingguang; Wu, Pan; Wang, Shilu; Guo, Mingwei; Liu, Kun

doi:10.1016/j.scitotenv.2022.156436

Cited by 9 publications

(7 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Revelle factor Huang et al (2022) and Li et al (2022) reported that the pH in the Huatan River was lower in summer and autumn (8.1 on average) and higher in winter and spring (8.4 on average). We believed that the oxidation of pyrite on a watershed scale would promote the acidification of water in the rainy season and enhance the carbon cycle through carbonate weathering.…”

Section: Variation Characteristics Of the Buffer Factorsmentioning

confidence: 98%

“…The Huatan River is a typical karst watershed influenced by AMD (Huang et al, 2022). The DIC concentration in this watershed has a relatively large variation (1.69-4.53 mM), with a mean value of 3.44 mM, which is significantly higher than that in the Wujiang River downstream as well as the marine system (Makkaveev, 2013;Zhong et al, 2017).…”

Section: Buffer Processes In the Huatan River Watershedmentioning

confidence: 99%

“…In terrestrial freshwater systems, especially in karst areas, factors affecting the buffer capacity of carbonate systems are more complex, and the variation in pH is much larger than that found in marine systems (Lauvset et al, 2015;Zhang et al, 2019). Moreover, the DIC concentration and alkalinity are also higher than those found in the ocean, and they often demonstrate nonlinear evolution, resulting in a greater variation in the Revelle factor (Huang et al, 2022). Moreover, the process revealed by the data on both sides of the maximum Revelle value is inconsistent.…”

Section: Variation Characteristics Of the Buffer Factorsmentioning

confidence: 99%

“…There are many coal mines in the watershed, such as the Huixin Coal Mine and Hongxing Coal Mine. Coal mining produces a large amount of AMD, with a pH as low as 2.3, which has a significant impact on the Huatan River (Li et al, 2018;Huang et al, 2022;Du et al, 2022).…”

Section: Overview Of the Study Areamentioning

confidence: 99%

See 3 more Smart Citations

The buffering of a riverine carbonate system under the input of acid mine drainage: Example from a small karst watershed, southwest China

Huang

et al. 2022

Front. Environ. Sci.

Self Cite

View full text Add to dashboard Cite

In a karstic area affected by acid mine drainage (AMD), hydrochemical conditions, such as temperature, salinity, alkalinity, DIC, dissolved oxygen, and nutrients, may affect the buffering capacity of carbonate systems in freshwater systems. The resulting pH fluctuation is larger than that of a marine system. Therefore, this study focuses on the buffering of a riverine carbonate system under the input of AMD and discusses the variations in a series of buffering factors, including the Revelle factor, γDIC, γAlk βDIC, βAlk, ωDIC, and ωAlk. The results revealed that the Revelle factor could reflect the buffering process effectively; in addition, the maximum value of the Revelle factor appeared at pH = 8.5. The data points for pH greater than this value indicated that the Huatan River had the ability to absorb atmospheric CO2 in spring. Conversely, the data for pH less than this value reflected the buffering of H+ during CO2 degassing in summer and autumn. In winter, the data were around the maximum value, indicating the weakest buffering capacity. As a result, the dynamics of the carbonate system caused the most sensitive response to pH. In addition, the maximum Revelle factor value did not always indicate the carbonate system had reached equilibrium; the presence of strong CO2 degassing was still a possibility. Under acidic conditions, as CO2(aq) increased, the absolute values of γDIC, βDIC, ωDIC, and γAlk increased correspondingly, indicating the enhanced buffering capacity of H+ during CO2 degassing. Under the four Representative Concentration Pathways scenarios (RCPs) included in the IPCC’s fifth assessment report, the degassing rate of the Huatan River would decrease by 5%, 15%, 26%, or 48%, depending on the scenario. Even though the Huatan River revealed CO2 degassing characteristics in winter and spring under current conditions, it will eventually become a sink for atmospheric CO2 as atmospheric CO2 concentration increases. In this light, the carbon sink effect in karst areas will become increasingly important.

show abstract

Section: Variation Characteristics Of the Buffer Factorsmentioning

confidence: 98%

Section: Buffer Processes In the Huatan River Watershedmentioning

confidence: 99%

Section: Variation Characteristics Of the Buffer Factorsmentioning

confidence: 99%

Section: Overview Of the Study Areamentioning

confidence: 99%

See 2 more Smart Citations

The buffering of a riverine carbonate system under the input of acid mine drainage: Example from a small karst watershed, southwest China

Huang

et al. 2022

Front. Environ. Sci.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The endemic fluorosis area, represented by the Bijie region in Southwest China, has a high soil fluoride content of 5,979 mg/kg (Wang et al, 2021). Furthermore, in the medium-to high-sulfur coal mining area of southwest China, the weathering of sulfide-rich coal-bearing strata can produce serious acid pollution in surface water Huang et al, 2022). The fluorine content in acid mine drainage (AMD) from the Zhijin mining area in Guizhou has been reported to be as high as 4.94 mg/L (Li X. et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Sources and migration characteristics of fluorine in the river water of a small karst watershed influenced by coal mining

Huang

et al. 2022

Front. Environ. Sci.

Self Cite

View full text Add to dashboard Cite

In high-fluorine geological background areas, the supergene geochemical process of fluorine has an impact on regional environmental health and safety, which has long been the focus of attention. However, in karst areas characterized by a high incidence of endemic fluorosis, the migration and transformation of fluorine in surface water have not received sufficient attention. This study investigated the joint influence of the weathering and erosion of carbonate rocks and coal-bearing strata on a typical small watershed. Accordingly, 239 samples representing 13 periods of hydrochemical samples were systematically collected to clarify the source, migration, and transformation characteristics of fluorine in surface water. The results revealed that the pH of the Huatan River was low in the rainy season and high in the dry season. The annual variation range of fluorine concentration was 0.11–0.40 mg/L. Although mining development produced acid mine drainage with high fluorine concentration, its impact at the watershed scale appeared to be limited. In terms of spatial scale, the concentration of fluorine in the Huatan River increased gradually from upstream to downstream. The dissolution of fluorite and other fluorine-bearing minerals had not reached the saturation state. The fluorine in the watershed primarily came from the dissolution of fluorine-bearing minerals, followed by the contribution of atmospheric precipitation. The release of fluorine adsorbed on the surface of clay minerals was not the main source of this element. The leaching of the watershed was shown to represent a critical transport process concerning fluorine in the Huatan River, and evaporation had a notable impact on the enrichment of fluorine in water.

show abstract

Combining hydrochemistry and 13C analysis to reveal the sources and contributions of dissolved inorganic carbon in the groundwater of coal mining areas, in East China

Jiang

et al. 2023

Environ Geochem Health

View full text Add to dashboard Cite

The effects of weathering of coal-bearing stratum on the transport and transformation of DIC in karst watershed

Cited by 9 publications

References 49 publications

The buffering of a riverine carbonate system under the input of acid mine drainage: Example from a small karst watershed, southwest China

The buffering of a riverine carbonate system under the input of acid mine drainage: Example from a small karst watershed, southwest China

Sources and migration characteristics of fluorine in the river water of a small karst watershed influenced by coal mining

Combining hydrochemistry and 13C analysis to reveal the sources and contributions of dissolved inorganic carbon in the groundwater of coal mining areas, in East China

Contact Info

Product

Resources

About