Intercomparison of five methods for the determination of trace metals in sea water

Boniforti, R.; Ferraroli, R.; Frigieri, P.; Heltai, D.; Queirazza, G.

doi:10.1016/s0003-2670(00)84225-7

Cited by 70 publications

(12 citation statements)

References 33 publications

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“…Preconcentration of sea water samples on Chelex-100 chelating resin was employed for dissolved Mn, Fe, Co, Ni, Cu, Zn, Cd and Pb (Boniforti et al, 1984) . Coprecipitation with iron hydroxides was used to concentrate the dissolved Cr, .…”

Section: Methodsmentioning

confidence: 99%

Geochemical cycling of heavy metals in a marine coastal area: benthic flux determination from pore water profiles and in situ measurements using benthic chambers

et al. 1992

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Concentrations of the heavy metals Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn were measured in sea water, suspended matter, sediments and pore water samples collected in a coastal area of the middle Tyrrhenian Sea . Concentration factors between pore water (extracted from the first centimeter of the sediments) and the overlying sea water (taken 30 cm above the sea bed) were less than 1 for Cr, Cu and Pb, 1-10 for Cd and Ni, 10-100 for Fe and Co, 100-1000 for Mn, and 1-100 for Zn .The benthic fluxes of heavy metals at the sediment-water interface were measured directly using in situ benthic chambers and calculated using Fick's first law during two experimental periods, one in 1986 and the other in 1988 . The fluxes of Cu, Ni, Pb and Zn varied significantly over time ; this appeared to be related to their relatively low (<_ 10) concentration factors . From the benthic chamber experiments, metals with positive fluxes were in the order : Mn > Fe > Co > Cd, while those with negative fluxes were : Zn > Pb > Ni Cu. Fluxes calculated using Fick's Law were : positive -Mn > Fe > Zn (or Zn > Fe) > Ni > Co > Cd, negative fluxes Pb > Cu > Cr .Measured (benthic chamber) and calculated (Fick's first law) fluxes for Co, Cd, Mn, Pb and Fe were comparable within an order of magnitude, although less agreement was found for Cu, Ni and Zn . Removal of Ni and Zn at the sediment-water interface has been proposed to explain the fact that the measured and calculated fluxes have opposite directions for these metals .

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Section: Methodsmentioning

confidence: 99%

Geochemical cycling of heavy metals in a marine coastal area: benthic flux determination from pore water profiles and in situ measurements using benthic chambers

et al. 1992

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“…A 750 ml water sample was filtered as soon as possible after collection through a previously acid-washed 0.45 µM membrane filter. The pH of the filtrates was adjusted to 4-5 with 6 N HCl [9,10]. The metals in the samples were extracted from the filtrate using solvent extraction (APDC-MIBK) as a chelating agent for the metals.…”

Section: Sampling and Analytical Methodologymentioning

confidence: 99%

“…The metals were complexed with ammonium pyrolidine dithiocarbmate (APDC; C 5 H 12 N 2 S 2 ) and extracted into methylisobutylketone (MIBK; (CH 3 ) 2 CHCH 2 COCH 3 )). Back-extraction into an acidic aqueous solution was done by shaking the extract with 35 ml of 1% HCl [10]. The concentration of different metals (Fe, Mn, Zn, Cu, and Pb) in the final acidic extracts was measured using a GBC-932 Ver.…”

Section: Sampling and Analytical Methodologymentioning

confidence: 99%

Dissolved trace-metal concentrations along the Mediterranean Sea, to the north of the Nile Delta Region, Egypt

Okbah

Nasr

2006

Chemistry and Ecology

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This work focuses on four marine sites of the Mediterranean Sea, north of the Nile Delta, Egypt. Surface-water samples were collected seasonally during 2003. The aim of this study is to assess the levels of some dissolved trace metals (Fe, Mn, Zn, Cu, and Pb) in two environmental conditions. The metal concentrations in the coastal zone were in the following ranges: 11.92-30.45 µg l −1 for Fe, 5.79-17.36 µg l −1 for Mn, 0.87-7.80 µg l −1 for Zn, 0.40-1.87 µg l −1 for Cu, and 1.53-10.31 µg l −1 for Pb. In the sites with continental water input (mixing zone), the metals were scattered in the following ranges: Fe (19.72-60.33 µg l −1 ), Mn (12.63-35.60 µg l −1 ), Zn (2.67-22.00), Cu (0.83-8.10 µg l −1 ), and Pb (1.72-29.7 µg l −1 ). The results for the metal concentrations showed a remarkable decrease in the levels of the different metals going from the estuaries and outlets into the coastal sea water. Generally, the levels of the metals in the two zones are higher than the background levels of the unpolluted area. A comparison of the trace-metal levels in the coastal zone of the Mediterranean Sea north of Nile Delta with the minimal risk concentration (reported by water-quality criteria, WQC) showed a significantly lower content at the coastal area of the Mediterranean sea of Egypt. The study also indicated that the impact of anthropogenic inputs was limited in the distribution of the metals, except that the Pb content was slightly higher in the area of the mixing zone than that reported for WQC. The relationships between the different trace-metal concentrations and the other parameters (salinity, chlorophyll a and suspended particulate matter) were discussed, and the simple regressions between them were evaluated.

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“…The other two products, Chelex‐100 and 8‐hydroxyquinoline, are polystyrene (a mixture of styrene and divinylbenzene) resin beads, not normally prepacked or disposed of following one use. The latter two products have been used by marine chemists for years to extract metals from seawater [21–32].…”

Section: Introductionmentioning

confidence: 99%

Development of a cation‐exchange methodology for marine toxicity identification evaluation applications

Burgess

Charles

Kuhn

et al. 1997

Enviro Toxic and Chemistry

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In phase I of a standard toxicity identification evaluation (TIE) six manipulations are used to characterize toxicity. The ethylenediaminetetraacetic acid addition manipulation is most often used to indicate toxicity caused by divalent metals. An alternative approach for characterizing/identifying metal toxicity is the use of cation‐exchange chromatography. In this study, five cation‐exchange media were compared to develop a method for using cation‐exchange chromatography as part of a marine TIE. To be considered useful the cation‐exchange media must meet the following criteria: (1) consistently (with minimal variability) extract and elute toxic concentrations of a mixture of metals spiked into seawater, (2) demonstrate negligible blank acute toxicity, and (3) function effectively with environmental samples. Two solid‐phase extraction media met the criteria: Supelco's LC‐WCX column and Alltech's Extract‐Clean IC‐Chelate column. In general, these columns were able to remove 80 to 100% of five metals (Cd, Cu, Ni, Pb, Zn) from spiked seawater, and 85 to 100% of metals could be eluted back into solution (except copper for which recovery was 65–75%). Columns functioned effectively with seawater spiked with metals concentrations approaching 600 μg/L and showed low intercolumn variability (coefficient of variation = 1.0–14%). For actual environmental samples, once column breakthrough was assessed, both columns reduced toxicity and metal concentrations in postcolumn samples. Further, reconstituted column eluates were as toxic as whole samples. The methodology described can be used to assist in the TIE characterization and identification of toxic metals in environmental samples.

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Intercomparison of five methods for the determination of trace metals in sea water

Cited by 70 publications

References 33 publications

Geochemical cycling of heavy metals in a marine coastal area: benthic flux determination from pore water profiles and in situ measurements using benthic chambers

Geochemical cycling of heavy metals in a marine coastal area: benthic flux determination from pore water profiles and in situ measurements using benthic chambers

Dissolved trace-metal concentrations along the Mediterranean Sea, to the north of the Nile Delta Region, Egypt

Development of a cation‐exchange methodology for marine toxicity identification evaluation applications

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