Mercury adsorption in the Mississippi River deltaic plain freshwater marsh soil of Louisiana Gulf coastal wetlands

Park, Jong‐Hwan; Wang, Jim J.; Xiao, Ran; Pensky, Scott; Kongchum, Manoch; DeLaune, Ronald D.; Seo, Dong‐Cheol

doi:10.1016/j.chemosphere.2017.12.104

Cited by 27 publications

(11 citation statements)

References 55 publications

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“…The pH value in soil can strongly change the mobility of mercury by influencing the different presence forms of mercury. As pH increases in soil, the bioavailability and mobility of mercury decreases [46,47,48], and the content of mercury increases, which is in agreement with our results. In the agricultural land, the occurrence of mercury content decreased in TS1, and the second peak in TS5 (Figure 4) was attributed to the influence of pH value change.…”

Section: Resultssupporting

confidence: 91%

The Mercury Behavior and Contamination in Soil Profiles in Mun River Basin, Northeast Thailand

Han

2019

IJERPH

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To determine the geochemical characteristics and contamination of soil mercury in the Mun River basin, northeast Thailand, the vertical mercury distribution patterns and mercury contamination levels in six soil profiles under different land uses are studied. A total of 240 soil samples collected from agricultural land, abandoned agricultural land, and woodland were analyzed by an RA-915M mercury analyzer to determine the total mercury (THg) content, which ranged from 0.13 to 69.40 μg∙kg−1 in the study area. In the soil cultivation layer (0–30 cm), the average content of THg in the woodland (15.89 μg∙kg−1) and the agricultural land (13.48 μg∙kg−1) were higher than that in the abandoned agricultural land (4.08 μg∙kg−1), indicating that the plants or crops could increase the content of mercury in the surface soil layer. The total organic carbon (TOC) and iron content with high positive correlations with the THg content significantly contributed to the adsorption of soil mercury. Moreover, a higher pH value in the soil and a finer grain size in soil texture can be beneficial for the enrichment of mercury. A geoaccumulation index was used to evaluate the contamination of mercury, showing that this area had a slight contamination, and a few soil sites were moderate contamination.

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Section: Resultssupporting

confidence: 91%

The Mercury Behavior and Contamination in Soil Profiles in Mun River Basin, Northeast Thailand

Han

2019

IJERPH

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“…e well-tting PSO model suggests that the adsorption of Cr(VI) onto aquifers is highly controlled by chemisorption. Electronic forces occur between anion groups of Cr(VI) and cation groups of aquifers by sharing or exchange of electrons [27]. Similar results reported in earlier studies also showed that the PSO kinetic model was most suitable for Cr(VI) adsorption [26,28,29].…”

Section: Journal Of Chemistrysupporting

confidence: 86%

Adsorption Characteristics and Transport Behavior of Cr(VI) in Shallow Aquifers Surrounding a Chromium Ore Processing Residue (COPR) Dumpsite

Liu

Li²,

Hu³

et al. 2019

Journal of Chemistry

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This study explored the stratigraphic distribution and soil/shallow aquifer characteristics surrounding a chromium ore processing residue (COPR) dumpsite at a former chemical factory in China. Total Cr levels in top soils (5–10 cm) nearby the COPR dumpsite were in the range of 8571.4–10711.4 mg/kg. Shallow aquifers (1–6 m) nearby the COPR dumpsite showed a maximum total Cr level of 9756.7 mg/kg. The concentrations of Cr(VI) in groundwater nearby the COPR dumpsite were 766.9–1347.5 mg/L. These results display that the top soils, shallow aquifers, and groundwater of the study site are severely polluted by Cr(VI). Then, three aquifers (silt, clay, and silty clay), respectively, collected from the depth of 1.4–2.4 m, 2.4–4.8 m, and 4.8–11.00 m were first used to evaluate the adsorption characteristics and transport behavior of Cr(VI) in shallow aquifers by both batch and column experiments. The adsorption of Cr(VI) on tested aquifers was well described by pseudo-second-order equation and Freundlich model. The adsorption capacities of Cr(VI) on three aquifers followed the order: clay > silty clay > silt. The kinetics proved that Cr(VI) is not easily adsorbed by the aquifer mediums but transports with groundwater. Thermodynamics indicated that Cr(VI) adsorption on tested aquifers was feasible, spontaneous, and endothermic. Cr(VI) adsorption on tested aquifers decreased with increasing pH. Furthermore, the transport of Cr(VI) in adsorption columns followed the sequence of clay < silty clay < silt. Desorption column experiments infer that the Cr(VI) adsorbed on aquifers will desorb and release into groundwater in the case of rainwater leaching. Therefore, a proper treatment of the COPR and a comprehensive management of soils are vital to prevent groundwater pollution.

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“…From 1996 to 2006, phosphate fertilizer increased from around 5.5 × 10 6 to 7.0 × 10 6 tons per year in southwest China. [46] Continuous addition of phosphate fertilizer can increase soil acidity, resulting in higher Hg desorption from soil [47] and decrease bioavailability, [48] potentially threatening human health through food-chain bioaccumulation. [49] Therefore, more acidic soil probably has resulted from anthropogenic effects in agricultural land than in natural land.…”

Section: Contents Of Thg Soc Soil Texture and Ph Valuesmentioning

confidence: 99%

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

Han

Zhang

2021

CLEAN Soil Air Water

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The policy-driven "Grain for Green Programme" (GGP) has resulted in large-scale land conversion from agricultural land to natural land in the karst area. One research surrounding the GGP is focused on evaluating its ecological implications for total mercury (THg) enrichment in Yinjiang County, Guizhou Province, Southwest China. Results show that 1) THg content in agricultural land (201.85 ± 57.23 µg kg −1 ) is lower compared to the forest (1048.62 ± 306.19 µg kg −1 ) and shrub (2582.60 ± 614.76 µg kg −1 ). 2) The THg content shows a good correlation with Fe (agricultural land: R = 0.75, p < 0.01; shrub: R = 0.88, p < 0.01), pH (shrub: R = 0.87, p < 0.01), and sand proportion (forest: R = −0.65, p < 0.01), rather than soil organic carbon (SOC). In the shrub, the increased pH and iron (Fe) content correspond to THg content between 1804 and 3743 µg kg −1 ; below the depth of 80 cm of the forest soil, the increased sand proportion correlates to THg content between 1223 and 748 µg kg −1 . 3) The risk index of the THg exceeds 320 in the soil and imposes a very high ecological risk to this area.

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Mercury adsorption in the Mississippi River deltaic plain freshwater marsh soil of Louisiana Gulf coastal wetlands

Cited by 27 publications

References 55 publications

The Mercury Behavior and Contamination in Soil Profiles in Mun River Basin, Northeast Thailand

The Mercury Behavior and Contamination in Soil Profiles in Mun River Basin, Northeast Thailand

Adsorption Characteristics and Transport Behavior of Cr(VI) in Shallow Aquifers Surrounding a Chromium Ore Processing Residue (COPR) Dumpsite

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

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