Metal-binding particles alleviate lead and zinc toxicity during seed germination of metallophyte grass Astrebla lappacea

Rossato, Laurence; Macfarlane, James; Whittaker, Michael R.; Pudmenzky, Alex; Doley, David; Schmidt, Susanne; Monteiro, Michael J.

doi:10.1016/j.jhazmat.2011.03.116

Cited by 10 publications

(56 citation statements)

References 70 publications

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“…Heavy metals contamination is one of the major causes for reduced crop yields and also poses serious threats to human and animal health through the food chain . Lead (Pb) is considered one of the most hazardous environmental pollutants due to its high persistence in the environment .…”

Section: Introductionmentioning

confidence: 99%

Seed priming with KNO₃ mediates biochemical processes to inhibit lead toxicity in maize (Zea mays L.)

et al. 2017

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Section: Introductionmentioning

confidence: 99%

Seed priming with KNO₃ mediates biochemical processes to inhibit lead toxicity in maize (Zea mays L.)

et al. 2017

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“…Mixing experiments were carried out to test the efficiency of functional X3 in reducing available concentrations of metals and increasing the WHC of the waste rock and tailings over a large pH range (6.3 to 2) in DIW and 0.01 M CaCl2. Two different percentages of X3 were added to each substrate based on their plant available metal contents so as to bind all or half of the soluble metals as described by Rossato et al (2011). For DIW treatments (pH 6.3), percentages of X3 added to substrates were 18.4 and 9.2% dry weight (DW) for waste rock and 3.2 and 1.6% DW for tailings.…”

Section: Determination Of Metal-binding and Water Holding Capacities mentioning

confidence: 99%

“…The metal-binding efficiencies of the particles in mine substrates were calculated using the formula by Rossato et al (2011):…”

Section: Determination Of Metal-binding and Water Holding Capacities mentioning

confidence: 99%

“…The use of nanoparticles (surface-functionalised polymer and nanoscale zero-valent iron) to remove metals such as mercury (Hg), Pb, cadmium (Cd) and chromium (Cr) from contaminated water and soils has been reported previously (Bell et al, 2006;Singh et al, 2012). Plant establishment in polluted sites could be enhanced through the targeted design and application of micron-or nano-sized particles that have the capacity to bind toxic soluble metals in soils and improve plant-water relations (Rossato et al, 2011). For example, application of insoluble hydrophilic polyacrylate polymers in mine soil contaminated with Pb 2+ has been shown to increase soil water holding capacity (Guiwei et al, 2008), reduce bioavailability of toxic trace elements such as Pb 2+ and Cu 2+ , and enhanced plant growth (de Varennes and Queda, 2005;Guiwei et al, 2008;Torres and de Varennes, 1998).…”

Section: Introductionmentioning

confidence: 99%

“…Nano-sized vivianite was effective in reducing the leachability and bioaccessibility of Cu(II) in calcareous, neutral and acidic soils (USEPA, 2005). Rossato et al (2011) showed that micron-size thiol functional cross-linked acrylamide polymer particles (called X3) were able to reduce the available solution concentrations of Pb 2+ (9.65 mM), Cu 2+ (4 mM) and Zn 2+ (10 mM) by 86.5, 75.5 and 63.84%, respectively. They also reported that X3 was not toxic to seed germination as it allowed normal germination and root elongation of the native metallophyte curly Mitchell grass (Astrebla lappacea) at phytotoxic available concentrations of Pb 2+ (9.65 mM) and Zn 2+ (10 mM).…”

Section: Introductionmentioning

confidence: 99%

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Micron-size metal-binding hydrogel particles improve germination and radicle elongation of Australian metallophyte grasses in mine waste rock and tailings

Guterres

Rossato

Pudmenzky

et al. 2012

Proceedings of the International Conference on Mine Closure

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Metal contamination of landscapes as a result of mining and other industrial activities is a pervasive problem worldwide. Metal contaminated soils often lack effective vegetation cover and are prone to contaminant leaching and dispersion through erosion, leading to contamination of the general environment. Hydrogels and similar hydrophilic and negatively-charged compounds are well-established ameliorants for wastes and tailings, but their application is constrained by transport (bulk), attributes, and cost. In this paper we demonstrate that metal-binding hydrogel particle amendments could be used to ameliorate substrates prior to planting, in order to enhance seedling emergence. In this study, micron-size thiol functional cross-linked acrylamide polymer hydrogel particles (X3) were synthesised and tested in laboratory-scale experiments on extremely saline and metal contaminated mine waste rock and tailings to determine: (i) their capacity to increase substrate water holding capacity (WHC); (ii) their metal-binding efficiency and capacity to reduce metal availability to plants to below the phytotoxicity threshold; and (iii) their effect on the germination characteristics and early radicle development of two Australian metallophyte grasses, Astrebla lappacea and Austrostipa scabra, under limiting and non-limiting water conditions. Addition of X3 to waste rock (18.4% dry weight) and tailings (3.2% dry weight) increased the WHC of both substrates, by more than 536% and 174% respectively, over the tested pH range from 2.0 to 6.3. X3 also significantly (P<0.05) lowered soluble concentrations of Al and Cu in leachate from amended waste rock, by up to 55 and 59% respectively between pH 3.2 and 6.3. Below pH 3.2, metal-binding efficiency declined to almost zero, suggesting a loss of particle functionality in extremely acidic conditions. X3 was not toxic to seed germination and significantly (P<0.05) increased germination percentages of A. lappacea and A. scabra in both waste rock and mine tailings in Petri dishes under controlled conditions. The highest germination percentages were recorded under a restricted water regime (substrates were watered to field capacity on the first day of the experiment but received no additional water thereafter). In A. lappacea, germination percentages increased to 43 and 10% in amended waste rock and tailings respectively compared to 9 and 0% in unamended treatments. In A. scabra, germination percentages increased from 0.5 to 24%, and from 6 to 21% in waste rock and tailings respectively. X3 also significantly (P<0.05) enhanced the radicle elongation of both species in contaminated waste rock and tailings. Under restricted water regime, radicle length of A. lappacea was increased to up to 19 and 13.5 mm in amended waste rock and tailings respectively as compared with 2 and 3 mm in unamended treatments. In A. scabra, radicle length was increased to up to 5.5 and 4.5 mm in amended waste rock and tailings respectively versus 0 and 1 mm in unamended treatments. https://papers.acg.uwa.edu.au/p/1...

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Effects of surfactants on low-molecular-weight organic acids to wash soil zinc

Chen

Zhang

et al. 2015

Environ Sci Pollut Res

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Soil washing is an effective approach to the removal of heavy metals from contaminated soil. In this study, the effects of the surfactants sodium dodecyl sulfate, Triton X-100, and non-ionic polyacrylamide (NPAM) on oxalic acid, tartaric acid, and citric acid used to remove zinc from contaminated soils were investigated. The Zn removal efficiencies of all washing solutions showed a logarithmic increase with acid concentrations from 0.5 to 10.0 g/L, while they decreased as pH increased from 4 to 9. Increasing the reaction time enhanced the effects of surfactants on Zn removal efficiencies by the acids during washing and significantly (P < 0.05) improved the removal under some mixed cases. Oxalic acid suffered antagonistic effects from the three surfactants and seriously damaged soil nutrients during the removal of soil Zn. Notably, the three surfactants caused synergistic effects on tartaric and citric acid during washing, with NPAM leading to an increase in Zn removal by 5.0 g/L citric acid of 10.60 % (P < 0.05) within 2 h. NPAM also alleviated the loss of cation exchange capacity of washed soils and obviously improved soil nitrogen concentrations. Overall, combining citric acid with NPAM offers a promising approach to the removal of zinc from contaminated soil.

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Metal-binding particles alleviate lead and zinc toxicity during seed germination of metallophyte grass Astrebla lappacea

Cited by 10 publications

References 70 publications

Seed priming with KNO₃ mediates biochemical processes to inhibit lead toxicity in maize (Zea mays L.)

Seed priming with KNO₃ mediates biochemical processes to inhibit lead toxicity in maize (Zea mays L.)

Micron-size metal-binding hydrogel particles improve germination and radicle elongation of Australian metallophyte grasses in mine waste rock and tailings

Effects of surfactants on low-molecular-weight organic acids to wash soil zinc

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Metal-binding particles alleviate lead and zinc toxicity during seed germination of metallophyte grass Astrebla lappacea

Cited by 10 publications

References 70 publications

Seed priming with KNO3 mediates biochemical processes to inhibit lead toxicity in maize (Zea mays L.)

Seed priming with KNO3 mediates biochemical processes to inhibit lead toxicity in maize (Zea mays L.)

Micron-size metal-binding hydrogel particles improve germination and radicle elongation of Australian metallophyte grasses in mine waste rock and tailings

Effects of surfactants on low-molecular-weight organic acids to wash soil zinc

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Product

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Seed priming with KNO₃ mediates biochemical processes to inhibit lead toxicity in maize (Zea mays L.)

Seed priming with KNO₃ mediates biochemical processes to inhibit lead toxicity in maize (Zea mays L.)