Analysis and Fractionation of Trace Elements in Soils

Laing, Gijs Du

doi:10.1002/9781444319477.ch4

Cited by 15 publications

(15 citation statements)

References 115 publications

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“…Compared to limited in vivoPb-RBA studies, manystudies investigated Pbfractions in soils using sequential extraction [23,24]. The methodofTessier et al [25]is the most widely used, which operationally separatesPb into5 fractions, i.e., exchangeable Pb, and Pb associated with carbonates, Fe/Mn oxides, organic matter, and residualfractions, showing decreasing bioavailability.…”

Section: Introductionmentioning

confidence: 99%

Lead bioaccessibility in 12 contaminated soils from China: Correlation to lead relative bioavailability and lead in different fractions

Cave

et al. 2015

Journal of Hazardous Materials

121

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HighlightsLead bioaccessibility in the gastric phase (GP) and Pb-RBA was generally lower in mining soils (0.4629%and 7.026%) than smelting (1992% and 3184%) and farming soils (1399% and 5161%), with more Pb in the residual fraction in mining soils. Lead bioaccessibilityvaried with assays, with SBRC (3.099%)producing significantly higher bioaccessible Pbthan other assays (0.4684%) in the gastric phase. However, Pb bioaccessibilityin the intestinal phase (IP) of all assays sharply decreased to 0.01-20%possibly due to Pbsorption to solid phase at higher pH. Lead bioaccessibility by UBM-GPassay was best correlated with Pb-RBA (r 2 =0.67), followed by IVG-GP (r 2 =0.55).Among different Pb fractions, strong correlation was found between Pb bioaccessibility/Pb-RBA andthe sum of exchangeable and carbonate fractions. Our study suggested thatUBM-GP assay has potential to determine Pbbioaccessibility in contaminated soils in China.

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Section: Introductionmentioning

confidence: 99%

Lead bioaccessibility in 12 contaminated soils from China: Correlation to lead relative bioavailability and lead in different fractions

Cave

et al. 2015

Journal of Hazardous Materials

121

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show abstract

Section: Introductionmentioning

confidence: 99%

“…Single chemical extraction methods are most commonly used to evaluate the availability of trace metal elements [ 10 , 17 , 18 ]. The major extractants for estimating availability/toxicity presently in use are unbuffered and buffered salt solutions, dilute acidic solutions, and solutions containing chelating agents [ 18 ]. Diluted acidic solutions, such as 0.43 mol/L HNO 3 (ISO 17586-2016) [ 19 ] has been used, which partially dissolve trace metal elements associated with different fractions such as exchangeable, carbonates, iron and manganese oxides and organic matter [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

“…The salt solutions, such as 0.01 mol/L CaCl 2 , 1 mol/L NH 4 NO 3 , were also used to extract exchangeable trace metal elements in soils. The exchangeable fraction includes weakly adsorbed elements retained on soil solid surfaces by relatively weak electrostatic interactions, elements that can be released by ion-exchange processes and elements that can be coprecipitated with carbonates [ 18 ]. The powerful chelating agents, such as diethylenetriamine pentaacetic acid (DTPA) and EDTA, have been used widely in soil extractions for predicting the availability/toxicity of trace metal elements in soils.…”

Section: Introductionmentioning

confidence: 99%

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Toxicity Thresholds Based on EDTA Extractable Nickel and Barley Root Elongation in Chinese Soils

Zhu

Jiang

Yang

et al. 2018

IJERPH

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The uncertainty in the risk assessment of trace metal elements in soils when total metal contents are used can be decreased by assessing their availability and/or extractability when the soils have a high background value or different sources of trace metal elements. In this study, the added water-soluble nickel (Ni) toxicity to barley root elongation was studied in 17 representative Chinese soil samples with and without artificial rainwater leaching. The extractability of added Ni in soils was estimated by three sequential extractions with ethylenediaminetetraacetic acid (EDTA). The results showed that the effective concentration of EDTA extractable Ni (EC50), which caused 50% inhibition of barley root elongation, ranged from 46 to 1019 mg/kg in unleached soils and 24 to 1563 mg/kg in leached soils. Regression models for EDTA extractable Ni and total Ni added to soils against soil properties indicated that EDTA extractable Ni was significantly correlated with the total Ni added to soils and that pH was the most important control factor. Regression models for toxicity thresholds based on EDTA extractable Ni against soil properties showed that soil citrate dithionate extractable Fe was more important than soil pH in predicting Ni toxicity. These results can be used to accurately assess the risk of contaminated soils with high background values and/or different Ni sources.

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“…Methods are based on the premise that labile metal is exhaustively solubilised using a single chemical extractant, whereas non-labile and inert metal is left in the solid phase. The DTPA extraction method is widely used, predominantly for the determination of extractable Cd, Cu, Fe and Mn (Laing, 2010). The DTPA method extracts less than the standard EDTA (NH 4 OAc + EDTA) method.…”

Section: Introductionmentioning

confidence: 99%

Nickel, Copper, Zinc and Cadmium Fractionation in Mangrove Sediments, Red Sea, Egypt

Marzouk

2017

Zagazig Journal of Agricultural Research

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Nickle (Ni), copper (Cu), zinc (Zn) and cadmium (Cd) in eight sediment samples from mangrove area, Red Sea, Egypt were fractionated using diethylenetriamine pentaacetic acid (DTPA) and a sequential extraction procedure (SEP). These sediment samples were collected horizontally from two locations (four samples from each site) based on different layer visual characterizations. Sediments were initially characterised using different analytical and statistical procedures. DTPA-extract table metal percent of the total metal content varies widely from 1.93 : 25.6% for Ni, from 3.86 : 18.2% for Cu from 0.6 to 4.1 for Zn and from 3.36 : 11.2% for Cd depending on soil characteristics. There no consistent trend of metal extracted by DTPA as a function of sediment depths although Cd DTPA (%) was increased by increasing sediment depths in site 1 and in site 2. Moreover, metal extracted by DTPA showed no consistent correspondence with any single fraction of SEP. The metal extracted by DTPA showed reasonable correlation with the summation of exchangeable (F1) and carbonate (F2) fractions in both sites. So it may be reasonable to conclude that most 'available' metal is (presumably) surface-bound on CaCO 3 , rather than occluded within CaCO 3 or present as a mixed solid-solution (Ca 1-x M x CO 3). Approximately 84%, 30%, 70% and 95% of the variability in PTPA-extractable-Ni, Cu, Zn and Cd (mg kg-1) values for a whole dataset, respectively were explained by the variation in soil pH, (%) SOM, (%) CaCO 3 and total metals content. Cd DTPA showed the highest prediction performance while Cu showed the worst case of the regression model in which Cu availability is more likely controlled by either the source of Cu or other conditions rather than sediment properties.

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Analysis and Fractionation of Trace Elements in Soils

Cited by 15 publications

References 115 publications

Lead bioaccessibility in 12 contaminated soils from China: Correlation to lead relative bioavailability and lead in different fractions

Lead bioaccessibility in 12 contaminated soils from China: Correlation to lead relative bioavailability and lead in different fractions

Toxicity Thresholds Based on EDTA Extractable Nickel and Barley Root Elongation in Chinese Soils

Nickel, Copper, Zinc and Cadmium Fractionation in Mangrove Sediments, Red Sea, Egypt

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