Extraction of heavy metals from contaminated soils: I. sequential extraction in surface soils and their relationships to DTPA extractable metals and metal plant uptake

Cajuste, L. J.; Cruz-Díaz, Jaime; García-Osorio, Cecilia

doi:10.1080/10934520009377024

Cited by 23 publications

(9 citation statements)

References 8 publications

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“…However, after 12-week incubation, 60%~70% of added Zn was still extractable by the DTPA method (Long et al, 2003). The results showed that a major portion of the Zn added to the garden soil is phytoavailable, which is in agreement with other studies (Cajuste et al, 2000;Darmawa and Wada, 1999).…”

Section: Bioavailability Of Added Heavy Metal In the Vegetable Gardensupporting

confidence: 82%

Assessing potential dietary toxicity of heavy metals in selected vegetables and food crops

Islam

Yang

et al. 2007

J. Zhejiang Univ. - Sci. B

236

123

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Abstract:Heavy metals, such as cadmium, copper, lead, chromium and mercury, are important environmental pollutants, particularly in areas with high anthropogenic pressure. Their presence in the atmosphere, soil and water, even in traces can cause serious problems to all organisms, and heavy metal bioaccumulation in the food chain especially can be highly dangerous to human health. Heavy metals enter the human body mainly through two routes namely: inhalation and ingestion, ingestion being the main route of exposure to these elements in human population. Heavy metals intake by human populations through food chain has been reported in many countries. Soil threshold for heavy metal toxicity is an important factor affecting soil environmental capacity of heavy metal and determines heavy metal cumulative loading limits. For soil-plant system, heavy metal toxicity threshold is the highest permissible content in the soil (total or bioavailable concentration) that does not pose any phytotoxic effects or heavy metals in the edible parts of the crops does not exceed food hygiene standards. Factors affecting the thresholds of dietary toxicity of heavy metal in soil-crop system include: soil type which includes soil pH, organic matter content, clay mineral and other soil chemical and biochemical properties; and crop species or cultivars regulated by genetic basis for heavy metal transport and accumulation in plants. In addition, the interactions of soil-plant root-microbes play important roles in regulating heavy metal movement from soil to the edible parts of crops. Agronomic practices such as fertilizer and water managements as well as crop rotation system can affect bioavailability and crop accumulation of heavy metals, thus influencing the thresholds for assessing dietary toxicity of heavy metals in the food chain. This paper reviews the phytotoxic effects and bioaccumulation of heavy metals in vegetables and food crops and assesses soil heavy metal thresholds for potential dietary toxicity.

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Section: Bioavailability Of Added Heavy Metal In the Vegetable Gardensupporting

confidence: 82%

Assessing potential dietary toxicity of heavy metals in selected vegetables and food crops

Islam

Yang

et al. 2007

J. Zhejiang Univ. - Sci. B

236

123

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“…Similar behaviour for Pb in soils was found in other studies (Cajuste et al, 2000;Shrivastava and Banerjee, 2004;Zhao et al, 2009;Favas et al, 2011;Kabala et al, 2011).…”

Section: Chemical Speciationsupporting

confidence: 72%

Time evolution of Pb(II) speciation in Pampa soil fractions

Ferreyroa

Montenegro

Tudino

et al. 2014

Chemical Speciation & Bioavailability

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Soil pollution by heavy metals, particularly lead, is an important environmental concern; the bioavailability of such pollutants is strongly dependent on their chemical form. Here, the speciation of Pb(II) in soil fractions as a function of time shortly after its incorporation is studied, using a selective sequential extraction method. The sample came from an Argentinean Pampas region and was extensively characterised, including Rietveld analysis of the silt+clay fraction XRD pattern to find the major mineral components. Experiments were run twice, once in the winter and once in the summer. The results show different speciation time profiles in both cases, showing faster changes in winter due to the higher water content. The summer experiment corresponds to an earlier stage in the speciation profile evolution compared with winter. The soluble/ exchangeable fraction decreases with time in summer but shows a lower and constant value in the winter. A high proportion is found to be adsorbed onto the stable (aluminosilicates+quartz) mineral fraction. The results strongly suggest that, even at a short time following soil pollution with Pb, a high proportion is adsorbed onto the mineral fraction, with only a low fraction being bioavailable. The most stable (mineral incorporated) form is observed to increase with time. Soil water content appears to be more important than temperature in determining the differences between the two.

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“…Hence, considerable research has been done on the evaluation of several methods for the determination of plant available Ni in a wide variety of metal contaminated soils in order to predict the possibility of phytotoxicity symptoms occurrence. Specifically, methods employing extracting solutions containing chelate substances [DTPA (diethylenetriaminepentaacetic acid), AB-DTPA (ammonium bicarbonate-diethylenetriaminepentaacetic acid), EDTA, , buffered and unbuffered salts (NaNO 3 , KCl, CaCl 2 , MgCl 2 , NH 4 Cl, CH 3 COONH 4 ), or acids (H 2 SO 4 , HNO 3 , HCl, CH 3 COOH, Mehlich-1) have been used for evaluating Ni bioavailability in Ni-enriched soils (Korcak and Fanning, 1978;Haq et al, 1980;Sanders et al, 1986;Mulchi et al, 1991;Roca and Pomares, 1991;Sauerbeck and Hein, 1991;Xiou et al, 1991;McGrath, 1996;Kennedy et al, 1997;Mellum et al, 1998;Cajuste et al, 2000;Moral et al, 2002;Fontes et al, 2008;Pande et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of certain Ni soil tests for an initial estimation of Ni sufficiency critical levels

Nikoli

2014

J. Plant Nutr. Soil Sci.

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Although Ni is officially recognized as an essential micronutrient for all higher plants, the majority of the published research on soil availability of Ni focuses on its hazardous role as a heavy metal. The objective of the study was to evaluate certain Ni soil tests in uncontaminated soils for an initial estimation of its sufficiency critical levels. Nickel was extracted from 30 cultivated soils employing the following extraction methods: DTPA, AB-DTPA, AAAc-EDTA, Mehlich-3, 0.1 M HCl, and 0.1 M HNO 3 . Ryegrass (Lolium perenne L.) was grown in pots containing the soils, harvested five times, certain plant parameters were determined, and the Cate-Nelson procedures were used for Ni critical levels determination. Among the six methods, HCl was the least reliable extractant for the evaluation of soil available Ni, whereas the most significant (p ≤ 5%) relationships between Ni concentration or Ni uptake by ryegrass and Ni soil tests were consistently obtained for AAAc-EDTA or Mehlich-3 extractable Ni. In many cases, > 80% of the variability of Ni concentration or uptake by ryegrass was explained by these two soil tests without the inclusion of other soil properties that affect Ni bioavailability. Sufficiency critical levels of Ni in soil were ≈ 2 mg kg -1 for both methods. Consequently, as an initial approach, concentrations of AAAc-EDTA or Mehlich-3 extractable Ni < 2 mg kg -1 are probably a good guide to indicate soils that will respond to Ni fertilization.

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Extraction of heavy metals from contaminated soils: I. sequential extraction in surface soils and their relationships to DTPA extractable metals and metal plant uptake

Cited by 23 publications

References 8 publications

Assessing potential dietary toxicity of heavy metals in selected vegetables and food crops

Assessing potential dietary toxicity of heavy metals in selected vegetables and food crops

Time evolution of Pb(II) speciation in Pampa soil fractions

Evaluation of certain Ni soil tests for an initial estimation of Ni sufficiency critical levels

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