Vertical Distribution and Contamination of Soil Mercury in Karst Catchment, Southwest China: Land‐Use Type Influence

Qu, Rui; Han, Guilin; Zhang, Qian

doi:10.1002/clen.202100061

Cited by 5 publications

(2 citation statements)

References 71 publications

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“…HCO 3 − and Ca 2+ concentrations dominated the anions and cations in river water, respectively. Water quality is closely linked to environmental safety and human health [50][51][52]. The urbanization of the Xiaojiang River basin has reached 39.4%, with a total population of nearly 300,000 [39].…”

Section: Hydrochemical Characteristics Of Xiaojiang Rivermentioning

confidence: 99%

Characteristics of Ions Composition and Chemical Weathering of Tributary in the Three Gorges Reservoir Region: The Perspective of Stratified Water Sample from Xiaojiang River

Wang

Han

et al. 2022

Water

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River water chemistry offers information on watershed weathering and responds to the global carbon cycle. Watershed weathering processes and water chemistry in stratified water are still unclear in Xiaojiang River, as a major tributary of the Three Gorges Reservoir (TGR) which is the largest reservoir in the world. Major ions of river water at different depths were measured to reveal the ionic composition and chemical weathering properties by principal component analysis and stoichiometry in Xiaojiang River. Ca2+−HCO3− dominated the hydrochemical facies of river. Surface river water had the lowest total dissolved solid (146 mg/L) compared to other layers of water. According to principal component analysis, the major ions were divided into two principal components. PC1 was the weathering end-member of rocks, including the main ions except K+ and NO3–N, and PC2 may be the mixed end-member of atmospheric input and anthropogenic input. From stoichiometry, carbonate weathering dominated the cationic composition, with a contribution ratio of 56.7%, whereas atmospheric input (15.2%) and silicates weathering (13.9%) had similar extent of contribution. Compared with other major tributaries of TGR, Xiaojiang had more intense chemical weathering processes. The weathering rates of carbonates and silicates were 19.33 ± 0.68 ton/km2/year and 3.56 ± 0.58 ton/km2/year, respectively. Sulfuric acid as a proton may have participated less in the weathering processes of Xiaojiang River. The CO2 consumption budgets for silicates and carbonates weathering were 0.8 ± 0.2 × 109 mol/year and 2.8 ± 0.2 × 109 mol/year, respectively. These results enrich the watershed weathering information of TGR tributaries and provide data support for understanding the global carbon cycle.

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Section: Hydrochemical Characteristics Of Xiaojiang Rivermentioning

confidence: 99%

Characteristics of Ions Composition and Chemical Weathering of Tributary in the Three Gorges Reservoir Region: The Perspective of Stratified Water Sample from Xiaojiang River

Wang

Han

et al. 2022

Water

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“…Understanding the distribution patterns of soil mercury and the factors that in uence it is crucial for preventing and managing mercury pollution. Research in karst catchments in the southwestern region showed that soil mercury content varied signi cantly among different land-use types 33 . Agricultural areas had higher mercury levels compared to forest and grassland areas.…”

Section: Statistical Analysis Methodsmentioning

confidence: 99%

Evaluating the level of total mercury present in the soils of a renowned tea production region

Xu,

Feng,

Xie

et al. 2024

Preprint

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Mercury is a highly toxic heavy metal pollutant, which can be detrimental to human health, yet research on soil mercury contamination in tea gardens is scarce. This work investigated the characteristics of total mercury pollution, source analysis, and health risk assessment by obtaining representative tea garden soils from 146 villages in a celebrated tea production region that is renowned for its oolong (Wulong) tea all over the world. It was found that the soils of the tea garden contained total mercury levels ranging from 0.025 to 0.296 mg/kg, with an average of 0.112 mg/kg. The analysis showed that 67.81% of the samples were free from pollution, while 31.51% exhibited no to moderate pollution, and only 0.68% were classified as moderately polluted, based on the Soil accumulation index method. The total mercury content has a strong positive relationship with total carbon content (TC), As, Na, and V (p < 0.01), as well as a significant positive correlation with Zn (p < 0.05), and a significant negative correlation with K (p < 0.05). The Positive matrix factorization (PMF) model revealed that natural sources were the major contributor to the mercury presentence in this tea production region, making up 72.4%. The likely daily intake of mercury through tea consumption in the studied region spans from 0.011 to 0.132 micrograms per kilogram of body weight per day (ug/kg bw/day), with an average intake of 0.050 ug/kg bw/day, predominantly remaining below the Hazard Quotient (HQ) threshold. The study systematically investigates the characteristics and potential hazards of soil mercury pollution in the primary Oolong tea cultivation regions, emphasizing the need for future research to assess mercury uptake in the food chain through tea consumption.

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Tracing Fe cycle isotopically in soils based on different land uses: Insight from a typical karst catchment, Southwest China

Han

Zhang

2023

Science of The Total Environment

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Vertical Distribution and Contamination of Soil Mercury in Karst Catchment, Southwest China: Land‐Use Type Influence

Cited by 5 publications

References 71 publications

Characteristics of Ions Composition and Chemical Weathering of Tributary in the Three Gorges Reservoir Region: The Perspective of Stratified Water Sample from Xiaojiang River

Characteristics of Ions Composition and Chemical Weathering of Tributary in the Three Gorges Reservoir Region: The Perspective of Stratified Water Sample from Xiaojiang River

Evaluating the level of total mercury present in the soils of a renowned tea production region

Tracing Fe cycle isotopically in soils based on different land uses: Insight from a typical karst catchment, Southwest China

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