Research on the geochemical background values and evolution rules of lake sediments for heavy metals and nutrients in the Eastern China Plain from 1937 to 2017

Luo, Mingke; Kang, Xiaoqi; Liu, Qian; Yu, Hui; Tao, Yanru; Wang, Haonan; Niu, Yong; Niu, Yuan

doi:10.1016/j.jhazmat.2022.129136

Cited by 20 publications

(3 citation statements)

References 39 publications

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“…Загальновідомо, що донні відкладення водотоків та водойм можна віднести до надійного показника екологічного стану гідроекосистеми [1]. Донні відкладення, особливо їх тонкодисперсна алювіальна фракція [2], акумулюють різні солі, сполуки важких металів, зважені речовини природного та техногенного походження [3][4][5]. Важкі метали, які переважно накопичуються в пелітовій фракції донних відкладень [6], за своїм походженням можуть бути як природні, так й техногенні [7].…”

Section: вступunclassified

Impact of dredging on the environmental state of a small river with considering the composition of bottom sediments

Chushkina¹,

Maksymova²,

Semeniaka³

2022

PWSH

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Reports on the environmental impact assessment of planned activities aimed at restoring the hydrological regime and sanitation of rivers do not always pay attention to in-depth analysis of the physicochemical composition of bottom sediments. The silt deposits have proven to be a good ameliorant for agricultural lands, provided they are of satisfactory quality. Bottom sediments, especially their fine alluvial fraction, accumulate various compounds and trace elements, including heavy metals. Analysis of the content of iron Fe, manganese Mn, cobalt Co, chromium Cr and determination of the integrated level of contamination of bottom sediments did not reveal their toxic contamination in the area of the village Kleshnivka and the village Petrykivka. Determination of "geoaccumulation indices" by G.M. Mueller allowed to classify the sediments of the Chaplinka River as unpolluted, and the man-caused load on the hydroecosystem as low. In compliance with the recommendations on the content of Mn grades in the soil cover of the obtained fifth Igeoclass, which provides heavy pollution and significant man-caused load on the hydroecosystem. To characterize the processes occurring in the hydroecosystem of the Chaplynka River, the bottom accumulation coefficient was calculated. The assessment of the ecological status of hydroecosystems revealed an overwhelming ecological emergency. There is a significant threat of deposits of iron Fe, manganese Mn in bottom sediments. Despite the low risk of contamination of bottom sediments with chromium Cr, the risk will increase due to the rather variable chemical composition of surface waters, and hence the possibility of an ecological crisis for the hydroecosystem. The sanitary condition of a small river could be improved by restoring its hydrological regime. The decrease in the efficiency of dredging works is related to the regulation of the regulation of the riverbed. In the vast majority of cases, hydraulic structures are not provided for or do not correspond to the current level regime of watercourses. After clearing the river bed, there is a danger of their secondary silting, due to the abandonment of part of the temporary dumps on the banks within the water protection zones without fixing.

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Section: вступunclassified

Impact of dredging on the environmental state of a small river with considering the composition of bottom sediments

Chushkina¹,

Maksymova²,

Semeniaka³

2022

PWSH

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“…Sediment is the ultimate sink of heavy metals in lakes, and thus it is widely employed as a geo-marker for assessing heavy metal pollution and environmental risks and for identifying potential pollution sources [ 8 , 9 , 10 , 11 , 12 ]. In recent years, numerous studies have been conducted to investigate heavy metals in lake sediments, aiming to determine their pollution status, ecological and health risks, as well as potential sources [ 1 , 4 , 5 , 7 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ]. These studies have furnished valuable data for comprehending heavy metal pollution in Chinese lakes.…”

Section: Introductionmentioning

confidence: 99%

“…Given the differences in chemical compositions between soil and lake sediment [ 10 ] and the spatial variabilities in metal concentrations in regional soils [ 22 ], there may be varying degrees of uncertainty in such assessments. Additionally, many studies have only focused on a subset of heavy metals in lake sediments and have often not included some important toxic metals like Hg [ 4 , 6 , 16 , 20 , 21 ]. Consequently, there is an urgent need to establish reliable geochemical baselines in representative lakes in China to assess the uncertainty/reliability of pollution and risk assessments by referring to regional background soils and to conduct comprehensive pollution assessments including as many toxic metals (metalloids) as possible, such as Hg, As, Cd, and Pb.…”

Section: Introductionmentioning

confidence: 99%

Uncertainties in Pollution and Risk Assessments of Heavy Metals in Lake Sediments Using Regional Background Soils in China

Wan

Gao

Song

et al. 2023

Toxics

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Background soils are frequently utilized as a surrogate to assess pollution levels and environmental risks of heavy metals in Chinese lakes. However, there remains a lack of understanding regarding the reliability and uncertainty of such assessments. Here, we determined heavy metals (As, Cd, Co, Cr, Cu, Hg, Ni, Pb, and Zn) in sediment cores from five rural lakes in North China to evaluate the reliability and uncertainty of the assessments using background soils by comparing them with assessments based on background sediments. Comparative studies reveal large uncertainties in the assessments using background soils. Among these metals, uncertainties for Hg and Cd are relatively large, whereas those for the other metals are minor. This discrepancy is due to the considerably higher natural variability of Hg and Cd in soils and sediments in comparison to the other metals. Generally, assessments utilizing background soils underestimate pollution levels and risks of Hg but overestimate those of Cd in these lakes. Despite limited human activities around the lakes, they still received a considerable influx of heavy metals via regional atmospheric transport. Assessments of the nine metals indicate moderate to considerable ecological risks in these lakes. The risks are contributed primarily (78–89%) by Hg and Cd. This study underscores the substantial uncertainties in assessing heavy metal pollution and risks using regional background soils and emphasizes the importance of controlling atmospheric emissions of Hg and Cd to mitigate pollution in rural and remote water bodies in China.

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Concentration of Heavy Metals in the Surface Sediments of Inflow Rivers in Northeastern Lake Tanganyika, East Africa

Wang,

et al. 2024

Water Air Soil Pollut

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Research on the geochemical background values and evolution rules of lake sediments for heavy metals and nutrients in the Eastern China Plain from 1937 to 2017

Cited by 20 publications

References 39 publications

Impact of dredging on the environmental state of a small river with considering the composition of bottom sediments

Impact of dredging on the environmental state of a small river with considering the composition of bottom sediments

Uncertainties in Pollution and Risk Assessments of Heavy Metals in Lake Sediments Using Regional Background Soils in China

Concentration of Heavy Metals in the Surface Sediments of Inflow Rivers in Northeastern Lake Tanganyika, East Africa

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