Natural and anthropogenic SO4 sources in the Arno river catchment, northern Tuscany, Italy: a chemical and isotopic reconnaissance

Cortecci, G.; Dinelli, Enrico; Bencini, Alessandro; Adorni-Braccesi, A.; Ruffa, Giorgia La

doi:10.1016/s0883-2927(01)00100-7

Cited by 85 publications

(28 citation statements)

References 17 publications

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“…According to nutrients and Chl a levels, the upstream tributaries (C2, C6, and C13) were within the range of the oligotrophic to mesotrophic status, while all other samples in general fell into the descriptions for eutrophic and hypereutrophic state (Nürnberg 1996). The upstream eastern mountain tributaries are located in drainage areas with low population pressure and no relevant sources of pollutants (Cerqueira et al 2005), and this was reflected in the observed low levels of electrical conductivity, TOC, TSS, SO 2− 4 , and low nitrate, org-N, and Chl a, as usually observed for pristine waters (Cortecci et al 2002;Saksena et al 2008). The similarity found between C3 (Canedo stream) and Fermentelos Lake samples may be related to the water retention (by a small weir) in this river section (creating common hydrological features with the lake) and the organic pollution attributed to sewage discharge (Rino and Gil 1987;Cerqueira et al 2005).…”

Section: Discussionmentioning

confidence: 62%

Impact of water quality on bacterioplankton assemblage along Cértima River Basin (central western Portugal) assessed by PCR–DGGE and multivariate analysis

Figueiredo

Ferreira

Cerqueira

et al. 2011

Environ Monit Assess

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The information on bacterial community composition (BCC) in Portuguese water bodies is very scarce. Cértima River (central western Portugal) is known to have high levels of pollution, namely organic. In the present work, the BCC from a set of 16 water samples collected from Cértima River Basin and its main tributaries was characterized using 16S rDNA-denaturing gradient gel electrophoresis, a culture-independent molecular approach. Molecular data were related to environmental parameters through multivariate analysis to investigate potential impact of water pollution along the river. Principal component analysis using environmental data showed a water quality gradient from more pristine waters (at the mountain tributaries) to waters with increasingly eutrophic potential (such as Fermentelos Lake). This gradient was mainly defined by factors such as organic and inorganic nutrient sources, electrical conductivity, hydrogen carbonate concentration, and pH. Molecular results showed variations in BCC along Cértima River Basin but in the main river section, a Bacteroidetes phylotype (Flavobacterium sp.) proved to be dominant throughout the river course. Multivariate analysis suggests that spatial variation of BCC along the Cértima River Basin depended mainly on parameters such as Chl a, total suspended solid (TSS), total organic carbon, electrical conductivity, and HCO[Formula: see text] levels. Bacteroidetes phylotypes were all related to higher electrical conductivity and HCO[Formula: see text] levels although some of these were also correlated with high SO[Formula: see text] and others with high soluble reactive phosphorus, nitrate, TN, and Kjeld-N levels. The Gammaproteobacteria occurrence was correlated with high SO[Formula: see text] levels. One of the Betaproteobacteria phylotypes showed to correlate with low redox potential (E(h)) and high temperature, pH, TSS, and Chl a levels while another one showed a negative correlation with Chl a values.

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Section: Discussionmentioning

confidence: 62%

Impact of water quality on bacterioplankton assemblage along Cértima River Basin (central western Portugal) assessed by PCR–DGGE and multivariate analysis

Figueiredo

Ferreira

Cerqueira

et al. 2011

Environ Monit Assess

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“…Secondary salinity is a widespread phenomenon that affects inland freshwater systems, including wetlands (Kerekes et al, 1986;Cortecci et al, 2002;Nielsen et al, 2003;Clark et al, 2006). Increasing salinity in inland wetlands poses the problem of unsustainable use of natural resources, with many environmental and socioeconomic repercussions (Williams, 2001;Schuyt and Brander, 2004;Australian Department of Environment and Conservation, 2012).…”

Section: Introductionmentioning

confidence: 99%

A reduction in mining and industrial effluents in the Blesbokspruit Ramsar wetland, South Africa: Has the quality of the surface water in the wetland improved?

Ambani

Annegarn

2016

WSA

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The Blesbokspruit Wetland, 40 km southeast of Johannesburg, South Africa, was listed as a Ramsar Wetland of International Importance in 1986. Following discharges of mine-waters in the mid-1990s, the wetland no longer complied with the Ramsar criteria. This paper reports on historical trends in surface water quality of the Blesbokspruit, as a step towards restoration to Ramsar status. Monthly water quality data (SO 4 , Na, Cl and Mg concentrations, pH and EC values), from January 2000 to December 2011, were obtained from Rand Water for sites at: the stream inflow, just after the discharge point of pumped underground mine-water from Grootvlei mine, and the stream outflow point. The major ions were grouped into two distinct time-variation patterns (SO 4 -Mg) and (Na-Cl). Despite extensive reports that the wetland had an acid mine drainage problem, the pH values over an 11-year period were constrained within a range of 6.7 to 8.8. In 2011, following the cessation of underground mine-water pumping operations, mineralisation of the Blesbokspruit showed a large stepwise reduction, in contrast to a slowly decreasing trend over the previous 10 years, in both the SO 4 -Mg and Na-Cl groups, and EC. The stepwise reduction suggests that the pulping plant within the paper mill, a major source of Na-Cl rich effluent, had ceased operations coincidentally with the cessation of underground water discharges. This contradicts previous findings that underground mine-water discharge was the principal contributor to contamination of the Blesbokspruit Wetland. So, while the Blesbokspruit may have had a high mineralisation problem, this was not simply an acid mine drainage problem, but a combination of the effects of mining and industry.

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“…-4.5 to ca. -3.5 [17], but values of about -15 are sometimes found in aquatic environments [19]. In each case, the sulfate(VI) ion from emissions of burning fossil fuels is distinguished by a speci c value of δ S(SO − ) characteristic for a particular emitter.…”

Section: Introductionmentioning

confidence: 99%

“…Phosphorus fertilizers washed out from crop elds are characterized by δ S values, ranging from -6.5 to +11.7 [19,23,24] and usually cause an enrichment of lacustrine sulfate(VI) in the heavy sulfur isotopes with increasing concentration of this sulfate. On the other hand, municipal wastewater discharge causes a decrease in the S value down to about 4.7 , which is a result of the discharge of oxidation products of reduced organic sulfur present in municipal wastewater [19].…”

Section: Introductionmentioning

confidence: 99%

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Variability of sulfur speciation in sediments from Sulejów,Turawa and Siemianówka dam reservoirs (Poland)

et al. 2015

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Abstract:A study on sulfur circulation in sediments was carried out in dam reservoirs (Sulejów, Siemianówka, Turawa) with di erent hydrological and age characteristics as well as with a di erent level of sediment accumulation and organic matter content. Di erences in the isotopic composition of SO − in the water column and small variations in the concentration of this ion were observed in the Turawa reservoir. The investigations did not show vertical variation in the watercolumn concentrations and isotopic composition. This is due to the small depths of the reservoir and mixing of water. A part of sulfate sulfur from the water column is reduced by incorporating it into cell structures, while a part of it is deposited in the sediment. The study revealed a small exchange of SO − between the water column and the sediment. Depending on the season of the year and the sediment sampling site, biogeochemical transformations of sulfur species are observed. A signi cant variation in the biogeochemical processes was found between the Siemianówka and Sulejów reservoirs, both in the concentrations and in the isotopic composition of particular sulfur species. This primarily results from the di erent characteristics of either of these reservoirs ( ows, sedimentation, and material discharge to the lake). The main source of sulfur supplied to the sediments in the Siemianówka reservoir is organic sulfur contained in organic matter deposited at the bottom. In the sediment, organic sulfur is bacterially oxidized and xed as SO − .This is manifested in a substantial enrichment of sulfate in S. The presence of polysul des was found in both reservoirs, but a distinct depletion of δ S(S − ) in the light sulfur isotope was observed in the Siemianówka reservoir. In a part of the Sulejów reservoir, polysul des are oxidized to SO − ,probably at the sediment/water interface.

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Natural and anthropogenic SO4 sources in the Arno river catchment, northern Tuscany, Italy: a chemical and isotopic reconnaissance

Cited by 85 publications

References 17 publications

Impact of water quality on bacterioplankton assemblage along Cértima River Basin (central western Portugal) assessed by PCR–DGGE and multivariate analysis

Impact of water quality on bacterioplankton assemblage along Cértima River Basin (central western Portugal) assessed by PCR–DGGE and multivariate analysis

A reduction in mining and industrial effluents in the Blesbokspruit Ramsar wetland, South Africa: Has the quality of the surface water in the wetland improved?

Variability of sulfur speciation in sediments from Sulejów,Turawa and Siemianówka dam reservoirs (Poland)

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