Long-term persistence of sedimentary copper contamination in Lake Orta: potential environmental risks 20 years after liming

Vignati, Davide A.L.; Bettinetti, Roberta; Marchetto, Aldo

doi:10.4081/jlimnol.2016.1232

Cited by 6 publications

(4 citation statements)

References 44 publications

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“…3) was positively correlated to both sediment (Vignati et al, 2016;R=0.729, n=27, P<0.001) and in-lake copper concentrations (R=0.609, n=27, P<0.001). We found also a negative (P<0.001) correlation with water pH.…”

Section: Resultsmentioning

confidence: 97%

Unexpected increases in rotifer resting egg abundances during the period of contamination of Lake Orta

et al. 2016

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Section: Resultsmentioning

confidence: 97%

Unexpected increases in rotifer resting egg abundances during the period of contamination of Lake Orta

et al. 2016

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“…Calibration was with respect to solutions freshly-prepared by serial dilution of Agilent Technologies multi-element standard solution 2A. The nuclides quantified were: 27 Al, 137 Ba, 40 Ca, 52 Cr, 53 Cr, 63 Cu, 65 Cu, 56 Fe, 57 Fe, 39 K, 24 Mg, 55 Mn, 23 Na, 60 Ni, 31 P, 206 Pb, 207 Pb, 208 Pb, 28 Si, 29 Si, 88 Sr, 45 Ti, 51 V, 64 Zn, and 66 Zn. The internal standard was 115 In.…”

Section: Icp-ms Analysismentioning

confidence: 99%

“…The composition of these components, together with their extraction in the early stages of the methods indicates that they originate from dissolution of calcareous material. This may be indigenous to the watershed of Lake Orta [48,49] or perhaps reflect liming that took place in 1989-1990 and involved the addition of >10,000 tons of finely powdered natural limestone to restore the lake's alkalinity [46,50,51].…”

Section: Carbonatesmentioning

confidence: 99%

Comparison of two non-specific flow-through sequential extraction approaches to identify the physico-chemical partitioning of potentially harmful elements in a certified reference material

Sagagi

Davidson

Cave

et al. 2021

Talanta

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Two non-specific sequential extraction methods utilising chemometric data processing (chemometric identification of substrates and element distribution, CISED) have been developed and used to determine the physico-chemical partitioning of potentially harmful elements (PHE) in certified reference material BCR CRM 701 (lake sediment). A miniaturised centrifugation method in which the sample was extracted on a filter insert in a polypropylene centrifuging tube, and a quasi-flow through method in which the sample was supported on a TX40 filter in a 47 mm in-line polycarbonate filter holder, gave similar results. The CISED data processing identified nine components. Seven of these were of geochemical origin -two carbonate components, an Al/Fe oxide/hydroxide component, three Fe-dominated components and one Si-dominated component -while the others represented the TX40 filter blank. The overall extraction capabilities of the methods were similar to that of the well-established BCR sequential extraction (steps 1-3). However, whilst the BCR extraction is operationally defined, the CISED provides information on associations between PHE and the geochemical components identified. The flow through CISED procedure has potential applications in investigating the chemical speciation of PHE associated with urban airborne particular matter.

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“…Lake Orta's sediments may still pose a toxic threat to benthic species. Vignati et al (2016) noted that Lake Orta's sediments still pose a potential risk of Cu toxicity to sediment-ingesting benthic organisms. They argued we need more information on Cu behaviour and bioavailaility as a function of sediment characteristics in order to rule out subtle and lasting effect on benthic species and communities.…”

Section: The Ecosystem Perspectivementioning

confidence: 99%

What have we learned about ecological recovery from liming interventions of acid lakes in Canada and Italy?

2016

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We adopted an ecosystem perspective, by: i) exploring timing and mechanisms through which the biota responded to changes in hydrochemistry; ii) identifying common versus unique responses in a comparison of similar case studies on a large scale; iii) disentangling specific roles of primary (heavy metals) vs secondary (acidification), direct (chemical) vs indirect (predator/prey), and regional (colonist supply) vs local (colonist survival and growth) regulators of recovery of the biota; and iv) attempting to identify transition points to new, stable communities. If we can circumvent the almost unavoidable issue of lack of replication, and include appropriate hypotheses, controls, and pre-and post-manipulation data, a liming intervention can be comparable to a whole lake experiment. It can provide an opportunity for testing ecosystem-level responses to strictly controlled changes in the physical and chemical environment. Such wholelake experiments have a long tradition in North America, but it is rare that the results of whole-lake restoration experiments in the acidification field have been compared between North America and Europe.Lake Orta and many lakes in Sudbury, Ontario, Canada, suffered from acidification and metal pollution, albeit from different sources. For Lake Orta, the source of acidity was oxidation of ammonia wastes from a textile factory (Bonacina et al., 1986), while for Sudbury lakes, the source was atmospheric deposition of strong, S-based acidity from both the local smelting of metal-rich sulphide ores and long-range transport (Yan et al., 1996). Heavy metals were also greatly elevated in both cases (Calderoni et al., 1992;Keller et al., 2007). In Sudbury, both catchments and several urban lakes were limed, while lime was added directly to Lake Orta.This comparison of Lake Orta with the Sudbury case studies was extremely fruitful. By applying bioassays, Celis-Salgado et al. (2016) found that differences in metal-tolerances, and differences in recovery rates of native Canadian Daphnia species were mediated by calcium and sodium concentrations in Sudbury lakes, and thus their recovery was influenced not just by residual metals, but also by road salt and background geology. From Lake Orta, Di Cesare et al. (2016) learned that because heavy metal pollution may be coupled with antibiotic presence in nature, there may be co-selection for multiple resistances. Lake Orta thus appears to be an excellent location to evaluate the spread and selection of heavy metals and antibiotic resistances in heavily disturbed environments. Macrobenthic assemblages were slow to recover in both countries, but there were success stories. In Sudbury lakes the littoral macrobenthos community remained severely impoverished after catchment liming, indicating that land reclamation would be necessary in severely damaged watershed, before lake ecosystems can recover . In Lake Orta, mussels were extirpated by industrial copper and ammonium sulphate pollution, soon after 1926, when a rayon factory began operations on the lakeshor...

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Long-term persistence of sedimentary copper contamination in Lake Orta: potential environmental risks 20 years after liming

Abstract: ABSTRACT

Cited by 6 publications

References 44 publications

Unexpected increases in rotifer resting egg abundances during the period of contamination of Lake Orta

Unexpected increases in rotifer resting egg abundances during the period of contamination of Lake Orta

Comparison of two non-specific flow-through sequential extraction approaches to identify the physico-chemical partitioning of potentially harmful elements in a certified reference material

What have we learned about ecological recovery from liming interventions of acid lakes in Canada and Italy?

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