Geochemical processes of iron and manganese in a seasonally stratified lake affected by coal-mining drainage in China

Wu, Fengquan; Wan, Guojiang; Huang, Rong; Pu, Yulin; Cai, Yongfeng

doi:10.1007/s102010170018

Cited by 6 publications

(4 citation statements)

References 12 publications

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“…In terms of spatial and temporal variations in metals concentrations, a number of studies confirmed that the process of thermal stratification has a strong influence on their dynamics (Hudson & Morel 1993;Wu et al 2001;Vasconcelos et al 2002). Namely, redox sensitive elements such as Fe, Mn and Cu exhibit seasonal changes resulting from changes in oxidizing and reducing conditions in lakes and reservoirs that stratify in summer.…”

Section: Dynamics Of the Limnological Characteristicsmentioning

confidence: 89%

Factors affecting distribution pattern of dominant macroinvertebrates in Mantovo Reservoir (Republic of Macedonia)

Slavevska-Stamenković¹,

Paunović

Smiljkov³

et al. 2012

Biologia

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Abstract:In the present study, we analysed spatial and temporal heterogeneity of the limnological characteristics to provide more detailed information about the processes taking place within Mantovo Reservoir (Republic of Macedonia). The relationship between principal macroinvertebrate species and environmental variables was analysed in order to explore factors that dominantly affect community distribution pattern. Unlike the most reservoirs, strong longitudinal gradient for suspended organic matter and nutrients (total phosphorous, nitrates and nitrites) along the reservoir doesn't exist. However, the process of thermal stratification has a strong influence on the metabolism and structure of the Mantovo ecosystem, which can be demonstrated by the vertical and longitudinal distribution of dissolved oxygen (DO), CO2, pH and metals concentrations. Canonical Correspondence Analysis (CCA) indicated that the main factors controlling spatial distribution of Limnodrilus hoffmeisteri and Chironomus plumosus group were temperature, dissolved oxygen and manganese, including sulphates for C. plumous group. Chaoborus crystallinus showed opposite distribution pattern. Cladotanytarsus mancus group was strongly associated with shallower part (littoral and sublittoral) of Mantovo Reservoir characterized by favourable oxygen condition. None of the environmental variables included in CCA showed any relationship with density of Procladius sp.

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Section: Dynamics Of the Limnological Characteristicsmentioning

confidence: 89%

Factors affecting distribution pattern of dominant macroinvertebrates in Mantovo Reservoir (Republic of Macedonia)

Slavevska-Stamenković¹,

Paunović

Smiljkov³

et al. 2012

Biologia

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“…However, no surficial peaks were observed in the Fe and Mn profiles of Soledad core and it is therefore, very likely that hypoxic-reduced conditions prevail in the Soledad Lagoon sampling site. The lower Mn concentrations found at the surficial layers of the core in contrast to the highest concentrations of Fe, could be explained on the basis of preferential reduction of manganese oxides to iron oxides (Wu et al 2001), since Fe oxides reduction requires stronger reduction conditions (below +100 mV) than Mn oxides, which begin to reduce at values slightly below 250-300 mV (Presley and Trefry 1980). Another interesting feature to note is the decreasing trend of CaCO 3 concentrations observed in the upper layers of the Soledad core.…”

Section: Sediment Characterizationmentioning

confidence: 98%

“…Another interesting feature to note is the decreasing trend of CaCO 3 concentrations observed in the upper layers of the Soledad core. As Mn species in the sediments might include Mn-bound carbonates in the particulate matter, and they can be dissolved due to a decrease in pH, promoted by the gradual decay of organic matter in the sediments (as explained below), the Mn loss from the sediments might not only be a result of Mn oxides reduction, but also due to CaCO 3 dissolution (Wu et al 2001). …”

Section: Sediment Characterizationmentioning

confidence: 98%

210Pb-derived Sedimentation Rates and Corg Fluxes in Soledad Lagoon (Cispatá Lagoon System, NW Caribbean Coast of Colombia)

Ruiz-Fernández

Marrugo‐Negrete

Paternina–Uribe

et al. 2011

Estuaries and Coasts

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With the aim of evaluating temporal changes in sedimentation and organic carbon (C org ) supplied over the last~100 years, a sediment core was collected at Soledad Lagoon, a costal ecosystem surrounded by mangroves, located in the Cispatá Estuary (Caribbean coast of Colombia). The core sediments were characterized by low concentrations of calcium carbonate (0.2-2.9%), organic matter (3-8%), total nitrogen (0.11-0.38%), and total phosphorus (0.19-0.65 mg g −1 ). Fe and Al concentrations ranged from 4% to 5%, and Mn from 356 to 1,047 μg g −1 .The 210 Pb-derived sediment and mass accumulation rates were 1.54±0.18 mm year −1 and 0.08±0.01 gcm −2 year −1 , respectively. The sediment core did not provide evidence of human impact, such as enhancement of primary production or nutrient enrichment, which may result from recent land uses changes or climate change. The C org fluxes estimated for Soledad Lagoon core lay in the higher side of carbon fluxes to coastal ecosystems (314-409 gm −2 year −1 ) and the relatively high C org preservation observed (~45%) indicate that these lagoon sediments has been a net and efficient sink of C org during the last century, which corroborate the importance of mangrove areas as important sites for carbon burial and therefore, long-term sequestration of C org .

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“…In the sediment-water interface, under certain biogeochemical conditions, through a variety of microbial and physico-chemical processes (e.g., pH changes, microbial activities, sediment redox condition), the possibility of heavy metals in the sediment recycled back into the overlying water may be enhanced remarkably (Clark et al, 1998;Guo et al, 1997;Wu et al, 2001). Hence, the heavy metal polluted aquatic sediments may be seen as "time bombs" for future pollution of the overall ecosystem including overlying water quality.…”

Section: Introductionmentioning

confidence: 99%

Influence of the environmental conditions on the fractionation of heavy metals in the Fenhe reservoir sediment

2010

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esses depending on variable environmental factors, especially the redox conditions and microbial activities. On the other hand, the mobility and transportation of heavy metals in sediments depend to a large extent on their type of fractionation. So the investigation on the effect of the redox conditions and microbial activities on the distribution characteristics of the heavy metal fractionations in the sediment seems indispensable, and it is also significant to understand the mechanism of heavy metal transportation under a certain micro-environment in the sediment-water interface.Predicting the fate and biogeochemical transportation of heavy metals in the sediment-water interface is one of the challenges for environ-geochemical research. The characteristics of the heavy metal fractionations in the pristine sediment sample have been extensively studied elsewhere, some researchers studied the release and fractionation of heavy metals in sediment (Baruah et al., Influence of the environmental conditions on the fractionation of heavy metals in the Fenhe reservoir sediment The BCR sequential extraction and EDTA single extraction method were applied to study the fractionation, concentration and bioaccessibility of the heavy metals in the sediment of Fenhe reservoir in North China. The sequential extraction schemes identify the non-residual metal among three basic operationally-defined host fractionations, namely, the soluble, exchangeable and carbonate bounded fractionation (F1), Fe-Mn oxides bounded fractionation (F2) and sulphide/organic matter bounded fractionation (F3). The metal extracted by the EDTA was defined as the bioaccessible fractionation (B) as well. The results showed the fractionation and concentration of heavy metals were influenced by the environmental condition. The bio-mineralization of natural organic matters in sediment as well as the microbial and chemical influence was the key factor controlling the distribution characteristics of different fractionations of heavy metals, including the dissolved iron content in the overlying water. The ratios of the sum of the three non-residual fractionations to the total concentration ((F1+F2+F3)/T) of Cd and Zn in the non-sterile sediment were higher than those in sterile sediment; the F2/ T value of Pb was the highest, which was 25.12, 3.47 and 12.40 times as those of Cd, Zn and Cr respectively. The variation characteristic of (F1+F2+F3)/T value of Cr was particular compared to the other three heavy metals. The EDTA single extraction experiment showed that the ratios of the bioaccessible fractionation to total concentration (B/T) of Cd and Pb in sediment were high enough to 24.96% and 39.56% respectively, while those of Zn and Cr were both below 5%, showing slim bioaccessibility. Taking the high bioaccessibility of F1 fractionation into consideration, the elevated B/T values of Cd and Pb were confirmed by the significant linear regression existed between the value of F1/T and the total concentration. As for Pb, the positive linear regression equations b...

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Geochemical processes of iron and manganese in a seasonally stratified lake affected by coal-mining drainage in China

Cited by 6 publications

References 12 publications

Factors affecting distribution pattern of dominant macroinvertebrates in Mantovo Reservoir (Republic of Macedonia)

Factors affecting distribution pattern of dominant macroinvertebrates in Mantovo Reservoir (Republic of Macedonia)

210Pb-derived Sedimentation Rates and Corg Fluxes in Soledad Lagoon (Cispatá Lagoon System, NW Caribbean Coast of Colombia)

Influence of the environmental conditions on the fractionation of heavy metals in the Fenhe reservoir sediment

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