Effects of sludge on heavy metals release from peppermint-planted soils during time as assessed by DGT technique

Bidast

et al. 2021

Preprint

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A greenhouse experiment was aimed at assessing the effects of poultry manure, sorghum, and clover residues (0 and 15 g kg-1) on the zinc (Zn) bioavailable fraction in contaminated calcareous soil using two chemical assay, diffusion gradient in thin films (DGT) and DTPA-TEA, and a bioassay with corn (Zea mase L.). The results showed that poultry manure, clover, and sorghum residues application increased dissolved organic carbon (DOC) by 53.6 and 36.1, and 9.2%, respectively, with respect to unamended soils, as well as decreasing soil pH by 0.42, 0.26, and 0.06 units, respectively. These changes did result in increases of Zn effective concentration (CE) and DTPA-Zn, and plant Zn concentration as a result of the increased exchangeable form of Zn. In the sorghum residues-amended soils, a reverse trend was observed for CE-Zn compared to the DTPA method. Correlation analyses revealed that unlike CE-Zn, DTPA-Zn had a positive correlation significantly with organic fractions that can be considered as an equivalent to the fact that the DTPA method had been overestimated Zn available to plants. The best correlations between corn metal concentrations and soil metal bioavailability were for CE-Zn using DGT technique, which also provided the best Zn bioavailability estimate. It is concluded that sorghum residues could be used to reduce the phytotoxicity risk of Zn in calcareous contaminated soil, and DTPA method is the less robust indicator of Zn bioavailability than DGT technique.

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Section: Discussionmentioning

confidence: 84%

“…DGTs were prepared by Heidari et al (2016) and evaluated for measuring the bioavailability of heavy metal using Mohseni et al (2020). After each application, the DGTs were removed then separated and eluted with deionized water.…”

Section: Dgt Techniquementioning

confidence: 99%

Determination of Poultry Manure and Plant Residues Effects on Zn Bioavailable Fraction in Contaminated Soil Via DGT Technique

Bidast

et al. 2021

Preprint

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“…A study by Soriano-Disla et al (2010) found that C E -Zn had the stronger correlation with sorghum root Zn concentration grown in sewage sludge-treated soils (r 2 = 0.91 ** ) in comparison to DTPA-extractable Zn (r 2 = 0.89 ** ). Another successful relationship between plant Zn concentration and C E -Zn (r 2 = 0.76 ** ) was also obtained in peppermint grown in sewage sludge-treated soils, but a less robust relationship was found with Zn concentrations in the shoot and DTPA-Zn (r 2 = 0.62 ** ) (Mohseni et al 2020).…”

Section: Discussionmentioning

confidence: 85%

Determination of poultry manure and plant residues effects on Zn bioavailable fraction in contaminated soil via DGT technique

Raei

et al. 2021

Preprint

Self Cite

A greenhouse experiment was aimed at assessing the effects of poultry manure, sorghum, and clover residues (0 and 15 g kg− 1) on the zinc (Zn) bioavailable fraction in contaminated calcareous soil using two chemical assay, including diffusion gradient in thin films (DGT) and diethylene triamine pentaacetic acid-triethanolamine (DTPA-TEA), and a bioassay with corn (Zea mase L.). The results showed that poultry manure, clover, and sorghum residues application increased dissolved organic carbon (DOC) by 53.6 and 36.1, and 9.2%, respectively, with respect to unamended soils, as well as decreasing soil pH by 0.42, 0.26, and 0.06 units, respectively. These changes did result in increases of Zn effective concentration (CE) and DTPA-Zn, and plant Zn concentration as a result of the increased exchangeable form of Zn. In the sorghum residues-amended soils, a reverse trend was observed for CE-Zn compared to the DTPA method. Correlation analyses revealed that unlike CE-Zn, DTPA-Zn had a significant positive correlation with organic fractions that can be considered as an equivalent to the fact that the DTPA method had been overestimated Zn available to the plant. The best correlations between corn metal concentrations and soil metal bioavailability were obtained for CE-Zn using DGT technique, which also provided the best Zn bioavailability estimate. It is concluded that sorghum residues could be used to reduce the phytotoxicity risk of Zn in calcareous contaminated soil, and DTPA method is the less robust indicator of Zn bioavailability than DGT technique.

show abstract

“…soils, but a less robust relationship was found with Zn concentrations in the shoot and DTPA-Zn (r 2 = 0.62 ** ) (Mohseni et al 2020).…”

Section: Discussionmentioning

confidence: 95%

Determination of Poultry Manure and Plant Residues Effects on Zn Bioavailable Fraction in Contaminated Soil via DGT Technique

Arch Environ Contam Toxicol

Raei

et al. 2021

Self Cite