Study of fractionation and potential mobility of metal in sludge from pyrite mining and affected river sediments: changes in mobility over time and use of artificial ageing as a tool in environmental impact assessment

Lacal, Javier; Silva, Ma Pilar da; García, Ramón Lanza; Sevilla, Ma Teresa; Procopio, Jesús R.; Hernández, L.

doi:10.1016/s0269-7491(02)00461-x

Cited by 65 publications

(24 citation statements)

References 25 publications

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“…Among these processes, in mineaffected rivers, weathering of minerals is one of the major processes that causes metal mobility in sediments (Lacal et al 2003). In the present study, for example, elevated Zn concentrations were observed in sediments at all sites below the mine (Fig.…”

Section: Sediment Metal Concentrationsmentioning

confidence: 99%

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Sediment Metal Concentration Survey Along the Mine-Affected Molonglo River, NSW, Australia

Wadige

Taylor

Krikowa

et al. 2016

Arch Environ Contam Toxicol

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Metal concentrations were measured in sediments of the mine-affected Molonglo River to determine current metal concentrations and distribution along the river. Compared with an uncontaminated site at 6.5 km upstream of the Captains Flat mine, sediments collected from the river at ≤12.5 km distance below the mine had a significantly higher percentage of finely divided silt and clay with higher concentrations of cadmium (Cd), copper (Cu), lead (Pb), and zinc (Zn). The measured metal concentrations in the mine affected sites of the river were in the following order: Zn = 697-6818 > Pb = 23-1796 > Cu = 10-628 > Cd = 0.13-8.7 µg/g dry mass. The highest recorded metal concentrations were Cd at 48, Cu at 45, Pb at 240, and Zn at 81 times higher than the background concentrations of these metals in the river sediments. A clear sediment metal-contamination gradient from the mine site to 63 km downstream was established for Cd, Cu, Pb, and Zn in the river sediments. Compared with sediment metal concentrations before a major flood in 2010, only Zn concentrations increased. For all of the mine-affected sites studied, Cd and Zn concentrations exceeded the (ANZECC/ARMCANZ, Australian and New Zealand guidelines for fresh and marine water quality. Australian and New Zealand Environment and Conservation Council/Agriculture and Resource Management Council of Australia and New Zealand, 2000) interim sediment-quality guidelines low values for Cd (1.5 µg/g dry mass) and the high value for Zn (410 µg/g dry mass). Existing metal loads in the riverbed sediments may still be adversely affecting the river infauna.

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Section: Sediment Metal Concentrationsmentioning

confidence: 99%

“…5). Compared with Pb, Zn has a higher mobility in sediments due to weathering of minerals which Zn is associated (Lacal et al 2003), therefore, remobilisation of sediment-bound Zn would be more likely to occur than for the other metals (Brooks 1980). As shown in Eq.…”

Section: Sediment Metal Concentrationsmentioning

confidence: 99%

Sediment Metal Concentration Survey Along the Mine-Affected Molonglo River, NSW, Australia

Wadige

Taylor

Krikowa

et al. 2016

Arch Environ Contam Toxicol

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“…Fractionation pattern in the samples was evaluated using the BCR three step sequential extraction procedure (Iskandar and Kirkham 2000;Lacala et al 2003, Rao et al 2008Ure et al 1993). Each chemical fraction was determined as follows:…”

Section: Sequential Extraction Methodsmentioning

confidence: 99%

Trace Metal Occurrence and Mobility Assessment in Stream Sediments near the Sungun Porphyry Copper Deposit in Northwest Iran

Moore

Aghazadeh

2012

Mine Water Environ

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The Sungun porphyry copper deposit is located 100 km northeast of Tabriz in the Azarbaijan province of Iran. The total concentration and chemical fractionation of metals and metalloids (As, Se, Cd, Cr, Ni, Co, and Zn) in sediment downstream of the Sungun mine was investigated. The degree of contamination was evaluated using the sediment pollution index (SPI) and enrichment factor. The concentrations of As, Cd, Se, and Zn in the contaminated sediments were elevated due to anthropogenic activities. According to the SPI, surface sediments in the ephemeral rivers flowing in the vicinity of the Sungun porphyry copper deposit are classified as natural sediment with no ecological risk, while sediments that received contaminated effluents are classified as slightly polluted. Sequential extraction indicated that Co was principally associated with the iron and manganese oxide fraction, while other elements (As, Zn, Cr, Se, and Ni) were mainly distributed in residual phases. Cadmium is the only element that has a high potential for mobility and bioavailability in the sediments and, of the investigated elements, it poses the greatest potential risk to the local aquatic ecosystems. The chemical fractionation pattern of elements appears to be influenced by industrial effluents. Although the bioavailable fraction of most contaminant metals is low due to the freshness of the sediments, over time, the oxidation of sulfide minerals in these sediments could contribute contaminant elements in soluble form.

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“…The volumes of extracting reagents were chosen to maintain the solid-liquid ratio used for the original modified BCR method. The extracting reagents were added in 1-3 steps, and shaken in an end-over-end mechanical shaker for different time intervals (6, 8, 10, 12, 14, 16 h) at room temperature (25-35°C), which was higher than that used in most other research (usually 20°C) (Lacal et al, 2003;Mossop and Davidson, 2003), due to the warm climate of Pakistan. To check the maximum shaking time for optimum recovery of the heavy metals, two tubes each of DWS and BCR 483 were removed after (2 h) centrifuged to separate the extractant from the residue.…”

Section: Optimization Of Sequential Methods Effect Of Shaking Timementioning

confidence: 99%

Time-saving application for sequential extraction of heavy metals by optimized BCR method and lixiviation from untreated sewage sludge

Jamali¹,

Kazi

Arain

et al. 2009

Acta Agronomica Hungarica

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This article describes an improvement in the modified BCR three-step sequential extraction procedure employed for heavy metals (Cd, Cr, Cu, Ni, Pb and Zn) in untreated domestic waste-water sewage sludge collected from different cities in Pakistan.The BCR sequential extraction protocol requires 16 h for each step, whereas in the present work optimum recoveries of all heavy metals were attained in 10 h/step. The validity of the proposed BCR sequential extraction procedure was checked using certified reference material (BCR 483). Various parameters such as time interval (2-16 h) and sample mass (0.2-1.0 g) were studied to achieve optimum recovery of the heavy metals studied. The extracted analytes were determined by atomic absorption spectrometry. The optimum recovery of heavy metals from the certified reference material and from experimental samples was achieved at a sample mass of 0.4 g, while the time required for extraction on a mechanical shaker at 30 rpm was found to be 26-32 h. The sequence of easily available (acid-exchangeable) heavy metals was determined as Cd

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Study of fractionation and potential mobility of metal in sludge from pyrite mining and affected river sediments: changes in mobility over time and use of artificial ageing as a tool in environmental impact assessment

Cited by 65 publications

References 25 publications

Sediment Metal Concentration Survey Along the Mine-Affected Molonglo River, NSW, Australia

Sediment Metal Concentration Survey Along the Mine-Affected Molonglo River, NSW, Australia

Trace Metal Occurrence and Mobility Assessment in Stream Sediments near the Sungun Porphyry Copper Deposit in Northwest Iran

Time-saving application for sequential extraction of heavy metals by optimized BCR method and lixiviation from untreated sewage sludge

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