Prediction of Zinc and Cadmium Phytoavailability Within a Contaminated Agricultural Site using DGT

Cornu, Jean-Yves; Denaix, Laurence

doi:10.1071/en05050

Cited by 36 publications

(19 citation statements)

References 13 publications

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“…Zinc content in cress (Lepidium sativum L.) shoots was larger in acidic soils (pH≈5) than in neutral soils (Zhang et al 2004), while Zn and Cd contents in lettuce (Lactuva sativa L.) shoots increased with decreasing pH in a range of contaminated soils (Cornu and Denaix 2006). Lexmond (1980) also noted a decrease in shoot Cu content of field-grown maize (Zea mays L.) with increasing soil pH, but to a much smaller extent than the decrease in free Cu 2+ concentration.…”

Section: Introductionmentioning

confidence: 97%

Rhizosphere alkalisation — a major driver of copper bioavailability over a broad pH range in an acidic, copper-contaminated soil

et al. 2008

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The impact of a large rhizosphere alkalisation on copper (Cu) bioavailability to durum wheat (Triticum turgidum durum L.) initially exposed to a broad range of bulk soil pH (4.8-7.5) was studied. Plants were exposed to a Cu-contaminated soil treated with eight levels of lime (Ca(OH) 2 ) and supplied with NO 3 − or NH 4 + -NO 3 − . Nitrate-fed plants strongly increased their rhizosphere pH to about 6.9-7.6, whatever the initial pH. NH 4 + -NO 3 − -fed plants slightly acidified their rhizosphere down to 3.9. Free Cu 2+ concentration in the rhizosphere was 3 orders of magnitude larger for NH 4 + -NO 3 − than NO 3 − fed plants. Consequently, Cu bioavailability was 2.4-to 4.2-fold larger for NH 4 + −NO 3 − -fed plants which demonstrates the importance of rhizosphere alkalisation to restrict metal bioavailability in acidic soils. Copper bioavailability of NO 3 − -fed plants initially exposed to a broad range of bulk soil pH was insensitive to bulk soil pH, as rhizosphere pH was ultimately neutral in any case.

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Section: Introductionmentioning

confidence: 97%

Rhizosphere alkalisation — a major driver of copper bioavailability over a broad pH range in an acidic, copper-contaminated soil

et al. 2008

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“…The extractants were 0.11 mol·L −1 HAc [27,29], 0.05 mol·L −1 EDTA and 0.01 mol·L −1 CaCl 2 [28,30]. Among the three methods, the 0.11 mol·L −1 HAc was the first step in a three-step sequential extraction procedure recommended by the European Community Bureau of Reference (BCR) [27,31,32,33].…”

Section: Methodsmentioning

confidence: 99%

“…A number of researchers contend that DGT-measured concentrations of Cd in soils were not well correlated with Cd concentrations in wheat [24], lettuce [25] and ryegrass [26] and the previous experimental results indicated that the DGT was not a robust tool for evaluating the Cd bioavailability; its measured labile concentrations were easily influenced by the species of accumulated biota and the physicochemical properties of soils [27,28,29]. As we know, different growth periods accounted for the different rate of uptake, but the DGT mimic the uptake processes mechanically.…”

Section: Introductionmentioning

confidence: 99%

The Evaluation on the Cadmium Net Concentration for Soil Ecosystems

Yao

Wang

et al. 2017

IJERPH

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Yixing, known as the “City of Ceramics”, is facing a new dilemma: a raw material crisis. Cadmium (Cd) exists in extremely high concentrations in soil due to the considerable input of industrial wastewater into the soil ecosystem. The in situ technique of diffusive gradients in thin film (DGT), the ex situ static equilibrium approach (HAc, EDTA and CaCl2), and the dissolved concentration in soil solution, as well as microwave digestion, were applied to predict the Cd bioavailability of soil, aiming to provide a robust and accurate method for Cd bioavailability evaluation in Yixing. Moreover, the typical local cash crops—paddy and zizania aquatica—were selected for Cd accumulation, aiming to select the ideal plants with tolerance to the soil Cd contamination. The results indicated that the biomasses of the two applied plants were sufficiently sensitive to reflect the stark regional differences of different sampling sites. The zizania aquatica could effectively reduce the total Cd concentration, as indicated by the high accumulation coefficients. However, the fact that the zizania aquatica has extremely high transfer coefficients, and its stem, as the edible part, might accumulate large amounts of Cd, led to the conclusion that zizania aquatica was not an ideal cash crop in Yixing. Furthermore, the labile Cd concentrations which were obtained by the DGT technique and dissolved in the soil solution showed a significant correlation with the Cd concentrations of the biota accumulation. However, the ex situ methods and the microwave digestion-obtained Cd concentrations showed a poor correlation with the accumulated Cd concentration in plant tissue. Correspondingly, the multiple linear regression models were built for fundamental analysis of the performance of different methods available for Cd bioavailability evaluation. The correlation coefficients of DGT obtained by the improved multiple linear regression model have not significantly improved compared to the coefficients obtained by the simple linear regression model. The results revealed that DGT was a robust measurement, which could obtain the labile Cd concentrations independent of the physicochemical features’ variation in the soil ecosystem. Consequently, these findings provide stronger evidence that DGT is an effective and ideal tool for labile Cd evaluation in Yixing.

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“…Pot trials have shown good correlations between plant metal uptake and metals measured in contaminated soils by DGT (Zhang et al 2001;Davison et al 2000;Zhang et al 2004). Plant Zn concentration was highly correlated with Zn determined by DGT in soil, and it has therefore been suggested that DGT is a sensitive tool to assess Zn phytoavailability in contaminated agricultural soils (Cornu and Denaix 2006). DGT has been used to assess the potentially bioavailable metal directly in soils in the field (Nowack et al 2004).…”

Section: Introductionmentioning

confidence: 98%

Plant-induced changes in the bioavailability of heavy metals in soil and biosolids assessed by DGT measurements

et al. 2010

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Purpose This study investigated the effects of plants on the available pools of heavy metals and their re-supply potential in contaminated substrates in a short-term experiment using five metal-accumulating willow and poplar species/cultivars and in a longer-term experiment for Salix x reichardtii. Material and methods Five species of willow and poplar were grown in either soil or biosolids for short-term experiment (4 months). Further investigations of longer-term effects of plant on metal availability were conducted with S. x reichardtii grown in biosolids in a column (100 cm height and 37.5 cm diameter) experiment over a period of 12 months. Samples collected before and after experiments were determined for pH and bioavailability of metals using diffusive gradients in thin films (DGT). Various pools of metals in biosolids were determined by sequential extraction. Concentrations of heavy metals in plant material were determined. Results and discussionThe concentration of metals determined by DGT (C DGT ) and concentration of metals in pore water (C SOL ) of Ni, Cu, Zn, and Cd in soil and biosolids generally decreased significantly compared to the initial measurements and were usually lower than those of the controls. However, C DGT and C SOL were higher in planted soil compared to those in the controls. There was a negative correlation between Ni, Zn, and Cd in plant shoots and C DGT in both soil and biosolids. The R values, the ratio of C DGT / C SOL calculated for Ni, Cd and Zn of planted substrates, were significantly higher than the corresponding R values of initial substrates. By contrast, R values for Cu showed little change. R values for Ni, Zn, and Cd were higher in planted biosolids compared to the unplanted biosolids. While S. x reichardtii leaf Cd, Ni, and Zn concentrations increased significantly over time, leaf Cu concentration declined. The patterns of plant uptake for the metals reflected the patterns observed by DGT and soil solution measurements of R. Sequential extraction of heavy metals from biosolids after 12 month's experimentation confirmed that Cu was predominantly in the organic fraction. Conclusions The short-term effects of plants on the bioavailability of metals in soils and biosolids were different. The R values of cultivated treatments varied between species but were not significantly different from the control in most of the cases. The longer-term experiment indicated that both C DGT and C SOL of Ni, Zn, and Cd decreased significantly over time in both planted and unplanted treatments. The results of this study demonstrated that R values measured by DGT may be useful in assessing the potential bioavailability of heavy metals in soil and biosolids.

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Prediction of Zinc and Cadmium Phytoavailability Within a Contaminated Agricultural Site using DGT

Cited by 36 publications

References 13 publications

Rhizosphere alkalisation — a major driver of copper bioavailability over a broad pH range in an acidic, copper-contaminated soil

Rhizosphere alkalisation — a major driver of copper bioavailability over a broad pH range in an acidic, copper-contaminated soil

The Evaluation on the Cadmium Net Concentration for Soil Ecosystems

Plant-induced changes in the bioavailability of heavy metals in soil and biosolids assessed by DGT measurements

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