Potential application of a semi-quantitative method for mercury determination in soils, sediments and gold mining residues

Yallouz, Allegra Viviane; César, Ricardo; Egler, Sílvia Gonçalves

doi:10.1016/j.envpol.2007.05.010

Cited by 11 publications

(10 citation statements)

References 9 publications

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“…In this respect, indiscriminate uses of Hg are historically well documented in Minas Gerais (Windmöller et al 2007), especially in small-scale gold mining sites for processing alluvial deposits. In the Brazilian Amazon, e.g., residues from abandoned gold mining sites can contain more than 4.4 mg/kg of Hg (Yallouz et al 2008). Leaching and erosion processes can mobilize such materials, contaminating surrounding soils and aquatic ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Mercury, copper and zinc contamination in soils and fluvial sediments from an abandoned gold mining area in southern Minas Gerais State, Brazil

et al. 2010

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Mercury, zinc and copper contamination was evaluated in soils and fluvial sediments from an abandoned gold mining site at Descoberto Municipality (southern Minas Gerais State, Brazil). Metals bioavailability and potential mobility were studied through physical, chemical and mineralogical characterization, geoaccumulation indexes calculations, mercury speciation and determination of potentially bioavailable contents of zinc and copper. Values of pH were in the neutral range, while organic matter concentrations were very low. Mineralogical characterization, in the total samples, indicated the presence of quartz, kaolinite and gibbsite for all samples. Total mercury, zinc and cooper concentrations were higher than the limits recommended by Brazilian documents. Geoaccumulations indexes revealed that most of the sediment samples were low to moderately polluted by zinc and copper, while just one sample was very strongly polluted by mercury. Mercury speciation revealed the predominance of the elementary form for all samples, and low concentrations for exchangeable, strongly bound and residual fractions. Zinc and copper behavior was strongly controlled by iron and aluminum concentrations, while their bioavailable contents were very low in comparison with the total concentrations.

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Section: Introductionmentioning

confidence: 99%

Mercury, copper and zinc contamination in soils and fluvial sediments from an abandoned gold mining area in southern Minas Gerais State, Brazil

et al. 2010

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“…Over the last decade there has been much interest in developing portable sensors for rapid identification of Hg. These sensors work by registering an output such as light emission (Huange et al 2016;Singh et al 2014), or electrochemical response (Duarte et al 2015;Zhou et al 2013), or are based on colorimetry (Choi et al 2014;Duan and Zhan 2015;Yallouz et al 2008). The challenging step in the use of such sensors is application to 'real' samples.…”

Section: Introductionmentioning

confidence: 99%

“…A Hg screening method that has been applied to freshwater sediment is the colorimetric paper-based sensor using copper(I)iodide (Yallouz et al 2008). The reaction involved, which is specific for Hg (Gettler and Kaye 1950), produces cuprous mercury iodide, Cu2[HgI4], a Hg complex with a characteristic orange colour.…”

Section: Introductionmentioning

confidence: 99%

Optimization and application of a low cost, colorimetric screening method for mercury in marine sediment

Cook

Davidson

Katsiris

et al. 2018

Environ Monit Assess

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A rapid, inexpensive, colorimetric screening method for mercury (Hg) has been optimized to provide a semi-quantitative measurement of Hg concentration in marine sediment within the range 0.038 to 1.5 mg kg encompassing the interim sediment quality guideline (ISQG) value of 0.13 mg kg (CCME 1999) and the probable effects level (PEL) of 0.7 mg kg for Hg in marine sediment (CCME 1999). Neither salinity (up to 41 practical salinity units (psu)) nor sediment organic matter (ΟΜ) content (up to 10%) affected the performance of the method. Accurate results were obtained for spike recovery experiments and analysis of certified reference material (CRM) BCR 580 Estuarine Sediment. The method was applied to sediment samples from Elefsina Bay, Greece. Screening results indicated Hg contamination in the bay, with concentrations exceeding the PEL value. Findings were confirmed by quantitative analysis of the samples by cold vapor atomic absorption spectrometry (CV-AAS), where results in the range 1.4-2.96 mg kg were determined.

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“…Different sources of pollution, associated with distinct chemical forms in the environment, can also play an important role in the toxicity of contaminants (Katz and Salem 1993;Yallouz et al 2008). In this respect, there is a lack of studies regarding the role of tropical soil properties in the availability of toxicants for edaphic fauna.…”

Section: Introductionmentioning

confidence: 99%

Disposal of dredged sediments in tropical soils: ecotoxicological evaluation based on bioassays with springtails and enchytraeids

César

Natal-da-Luz

Bidone

et al. 2014

Environ Sci Pollut Res

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Metal reference values established in Brazilian legislation for terrestrial disposal of dredged sediments and soil quality were derived for temperate regions. To evaluate the adequacy of such metal reference values to tropical soils, the ecotoxicity of a dredged sediment (from the Guanabara bay, Rio de Janeiro, Brazil) was investigated in two local soils (ferralsol and chernosol) by performing avoidance and reproduction tests using Folsomia candida and Enchytraeus crypticus. Test doses consisted of 0 %, 1.25 %, 2.5 %, 5, 10 %, and 20 %. Total and potentially bioavailable metal concentrations were determined in the test mixtures. Although the chernosol mixtures had the highest total metal concentrations, the influence of the expansive clay minerals (with high ability to adsorb metals) and the high contents of nutrients typical from this type of soils, seem to reduce the ecotoxicity. Collembolan avoidance behavior was the least sensitive endpoint. The lowest sediment doses increased the reproduction of F. candida in ferralsol mixtures. E. crypticus reproduction in the ferralsol mixtures were more pronounced at lower concentrations than in chernosol mixtures. Possibly the low nutrient content of the ferralsols, in connection with the addition of small amounts of sediment, created particular conditions that promoted reproduction of the test species. Data obtained in the ecotoxicological tests may support the establishment of a "safe" ecological dose of dredged sediments to be applied in tropical soils, supporting decision-makers in programs of environmental management.

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Potential application of a semi-quantitative method for mercury determination in soils, sediments and gold mining residues

Cited by 11 publications

References 9 publications

Mercury, copper and zinc contamination in soils and fluvial sediments from an abandoned gold mining area in southern Minas Gerais State, Brazil

Mercury, copper and zinc contamination in soils and fluvial sediments from an abandoned gold mining area in southern Minas Gerais State, Brazil

Optimization and application of a low cost, colorimetric screening method for mercury in marine sediment

Disposal of dredged sediments in tropical soils: ecotoxicological evaluation based on bioassays with springtails and enchytraeids

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