Influence of mining activities on groundwater hydrochemistry and heavy metal migration using a self-organizing map (SOM)

Zhu, Ge; Wu, Xiong; Ge, Jianping; Liu, Fei; Zhao, Weiguang; Wu, Chu

doi:10.1016/j.jclepro.2020.120664

Cited by 130 publications

(27 citation statements)

References 45 publications

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“…When entering the discharge area (downstream area), the groundwater is gradually affected by surface water recharging, human activities and evaporation. Both Na + and Cl − begin to increase and the distribution of the groundwater sample points along y = x also begins to show a trend of unevenness [34]. This is also confirmed by the plot shown in Fig.…”

Section: Hydrochemistrysupporting

confidence: 74%

Geochemical and isotopic evidence of groundwater salinization processes in the Essaouira region, north-west coast, Morocco

et al. 2021

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The city of Essaouira is located along the north-west coast of Morocco, where groundwater is the main source of drinking, domestic and agricultural water. In recent decades, the salinity of groundwater has increased, which is why geochemical techniques and environmental isotopes have been used to determine the main sources of groundwater recharge and salinization. The hydrochemical study shows that for the years 1995, 2007, 2016 and 2019, the chemical composition of groundwater in the study area consists of HCO3–Ca–Mg, Cl–Ca–Mg, SO4–Ca and Cl–Na chemical facies. The results show that from 1995 to 2019, electrical conductivity increased and that could be explained by a decrease in annual rainfall in relation to climate change and water–rock interaction processes. Geochemical and environmental isotope data show that the main geochemical mechanisms controlling the hydrochemical evolution of groundwater in the Cenomanian–Turonian aquifer are the water–rock interaction and the cation exchange process. The diagram of δ2H = 8 * δ18O + 10 shows that the isotopic contents are close or above to the Global Meteoric Water Line, which suggests that the aquifer is recharged by precipitation of Atlantic origin. In conclusion, groundwater withdrawal should be well controlled to prevent groundwater salinization and further intrusion of seawater due to the lack of annual groundwater recharge in the Essaouira region.

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Section: Hydrochemistrysupporting

confidence: 74%

Geochemical and isotopic evidence of groundwater salinization processes in the Essaouira region, north-west coast, Morocco

et al. 2021

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“…High-value neurons were expressed in red, while lowvalue neurons were expressed in blue. By comparing the color gradient changes of SOM of heavy metals, the information connection and quantitative relationship between each heavy metal can be intuitively displayed [17]. The five heavy metals Pb, U, V, Ni and Cr had similar color gradients, indicating a strong positive correlation between these four indexes.…”

Section: Statistical Analysis Of Heavy Metal Content In Sedimentmentioning

confidence: 98%

“…Classification of the geoaccumulation index and division of pollution level [6]. [17] studied by [16] in 2011 (that is, points closer to the sampling points #14 and #15 in this paper), The content of heavy metals (Pb, Cr, Cu, and Zn) in the sediments of sampling points #14 and #15 were lower than that in 2011, which may be related to the treatment of black and smelly water body and the vegetation greening of delta ecological park in recent years. SOM Evaluation of Heavy Metals in Sediment Fig.…”

Section: Statistical Analysis Of Heavy Metal Content In Sedimentmentioning

confidence: 99%

The Characteristics and Source Analysis of Heavy Metals in the Sediment of Water Area of Urban Scenic: A Case Study of the Delta Park in Suzhou City, Anhui Province, China

Jiang¹,

Gui²,

Chen³

et al. 2021

Pol. J. Environ. Stud.

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“…All values of TDS were within the permissible limit suggested by NSDWQ with the exception of water samples from underground mining site and mining pond in both dry and rainy seasons. Zhu et al [22] reported similar results when they studied the effects of mining activities on groundwater hydrochemistry and heavy metals migration in the Yangtze Metallogenic Region, Eastern China.…”

Section: Physical Parameters Of the Groundwater Samplesmentioning

confidence: 63%

Evaluation of Heavy Metals Pollution Status of the Groundwater around Riruwai Mining Area, Kano State, Nigeria

Badamasi¹,

Hassan

Adamu

et al. 2021

EJGEO

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The aim of this study was to investigate the heavy metals pollution status of the groundwater of Riruwai mining area, Kano State, Nigeria. A total of 31 groundwater samples were collected from five sampling locations which include: underground mining site (RGWI), tap water, (RGW2), surface mining ponds (RGW3), borehole (RGW4) and the well water samples (RGW5) during the dry and rainy seasons. The concentrations of seven heavy metals (As, Cd, Cr, Hg, Mn, Pb and Zn) and some physical parameters (pH, EC, and TDS) were determined using Atomic Absorption Spectrometer and Deluxe Water and Soil Analysis Kit respectively. The results of the analysis revealed that pH, EC and TDS were within the desirable limits recommended by WHO and NSDWQ in all sampling locations except in RGW1 and RGW3 for both seasons. The concentrations of heavy metals ranged as follow: As (ND to 0.15), Cd (ND to 0.1), Cr (ND to 0.25), Hg (ND to 0.09), Mn (0.12 to 0.66), Pb (0.003 to 0.06) and Zn (2.29 to 11.75), and As (0.005 to 020), Cd (0.001 to 0.15), Cr (0.001 to 0.17), Hg (ND to 0.14), Mn (0.16 to 0.92), Pb (0.007 to 0.09) and Zn (2.85 to 14.05) during the dry and rainy seasons respectively. The heavy metals concentrations changed along with the sampling sites in decreasing order of RGW1 > RGW2 > RGW3 > RGW4 > RGW5 in both seasons. The concentrations of all heavy metals were above the desirable limits recommended by WHO and NSDWQ during both seasons except well water samples (RGW5) and some few locations where the heavy metals were not detected. Therefore, it is recommended that water resources of the Riruwai mining area should be monitored closely, and more efforts should be made to reduce heavy metals concentrations level, particularly As, Cd, Cr and Zn.

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Influence of mining activities on groundwater hydrochemistry and heavy metal migration using a self-organizing map (SOM)

Cited by 130 publications

References 45 publications

Geochemical and isotopic evidence of groundwater salinization processes in the Essaouira region, north-west coast, Morocco

Geochemical and isotopic evidence of groundwater salinization processes in the Essaouira region, north-west coast, Morocco

The Characteristics and Source Analysis of Heavy Metals in the Sediment of Water Area of Urban Scenic: A Case Study of the Delta Park in Suzhou City, Anhui Province, China

Evaluation of Heavy Metals Pollution Status of the Groundwater around Riruwai Mining Area, Kano State, Nigeria

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