Aluminium in Acid Soils: Chemistry, Toxicity and Impact on Maize Plants

Krstić, Dragana; Djalović, Ivica; Nikezić, D.; Bjelić, Dragana

doi:10.5772/33077

Cited by 25 publications

(27 citation statements)

References 50 publications

(29 reference statements)

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“…Speciation of Al and Fe in solution is complex and controlled by pH [29,30]. In this study, a large proportion of added Al and Fe precipitated prior to adding biochar, even at pH 4, possibly due to hydrolysing and oxidizing conditions during shaking of the suspension.…”

Section: Discussionmentioning

confidence: 93%

“…Under acidic oxidising conditions, ferric species [Fe(III)] in the form of iron oxyhdrosulfate (e.g., Schwertmannite, Jarosite) minerals are precipitated [26,28]. The effect of pH on aluminium speciation is quite complex [29,30]. At pH above 5, aluminium is predominantly present as mononuclear species AlOH 2 + , Al(OH) 2 + , Al(OH) 3 , and Al(OH) 4 − , or forms soluble complexes with e.g., sulfate or fluoride [29].…”

Section: Introductionmentioning

confidence: 99%

“…Between pH 3 and 5, such as commonly found in areas impacted by sulfuric material in ASS, Al 3+ species are dominant [30]. At pH 7, insoluble Al(OH) 3 or polynuclear aluminium species are formed [29]. pH is likely to influence metal binding to biochar, through its effect on cation exchange capacity, surface complexation, metal solubilisation, and precipitation.…”

Section: Introductionmentioning

confidence: 99%

“…The effect of pH on aluminium speciation is quite complex [29,30]. At pH above 5, aluminium is predominantly present as mononuclear species AlOH 2 + , Al(OH) 2 + , Al(OH) 3 , and Al(OH) 4 − , or forms soluble complexes with e.g., sulfate or fluoride [29]. Between pH 3 and 5, such as commonly found in areas impacted by sulfuric material in ASS, Al 3+ species are dominant [30].…”

Section: Introductionmentioning

confidence: 99%

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Assessment of the Binding of Protons, Al and Fe to Biochar at Different pH Values and Soluble Metal Concentrations

Dang

Marschner

Fitzpatrick

et al. 2018

Water

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Biochar can retain large amounts of protons and metals in the drainage water from acid sulfate soils and mine sites. Metal sorption can, however, be influenced by many factors, such as pH and metal composition. This study investigated proton, Al, and Fe retention capacity of eucalyptus biochar (1% w/v) at different pH and metal concentrations. In the absence of metals, the biochar had a high proton binding capacity, (up to 0.035 mmol of H + ), whereas its capacity to retain hydroxide ions was limited. A batch experiment was carried out at pH 4 and pH 7 with 10 −6 , 10 −5 , 10 −4 , 10 −3 , and 10 −2 M of added Fe or Al. Added metals precipitated considerably prior to addition of the biochar except that Al remained highly soluble at pH 4. The biochar had a high retention capacity for Al and Fe; at high (>1 mM) concentrations, over 80% of soluble metals were retained. Metal competition for binding sites of both Al and Fe at different ratios was investigated, but increasing concentrations of one metal did not reduce retention of the other. The results confirmed that biochar has high metal binding capacity under both acidic and neutral conditions.

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Section: Discussionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Assessment of the Binding of Protons, Al and Fe to Biochar at Different pH Values and Soluble Metal Concentrations

Dang

Marschner

Fitzpatrick

et al. 2018

Water

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“…Root length measurement is one of the primary criteria used for evaluation for aluminum tolerance in hydroponic conditions [36,37]. Other traits like ratio of root to shoot fresh weight [38], total dry weight of the roots, and total dry weight of the shoots have been used for identifying aluminum-tolerant genotypes.…”

Section: Correlation Among Seedling Traitsmentioning

confidence: 99%

Genotypic Variation in Seedling Tolerance to Aluminum Toxicity in Historical Maize Inbred Lines of Zambia

et al. 2015

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Maize (Zea mays L) is the most important food grain in sub-Saharan Africa and is mostly grown by small-scale farmers under rainfed conditions. Aluminum toxicity caused by low pH is one of the abiotic factors limiting maize production among smallholder farmers. Therefore, breeding maize hybrids that are tolerant to aluminum toxicity will sustain and increase maize production in these areas. Hence this study was undertaken to assess the genotypic variation for aluminum toxicity in maize inbred lines. Fourteen maize inbred lines of historical importance that are used in maize hybrid breeding in Zambia were studied for seedling root variation under different aluminum concentrations using hydroponic conditions. The aluminum tolerance membership index based on three traits (actual root length, relative root length and root length response) classified genotypes L3233 and L1214 as highly tolerant, L5527 and ZM421 as tolerant, and L12, L3234, and ZM521 as intermediate. The high PCV, GCV, and heritability observed for the root traits indicate that opportunities for selection and breeding for aluminum tolerance among Zambian inbred lines exist. Furthermore, the study indicated that a higher genetic gain would be expected from net root growth followed by shoot length response as selection traits, thus supporting the use of root traits for aluminum tolerance screening. OPEN ACCESSAgronomy 2015, 5 201

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Preliminary studies on potential remediation of acid mine drainage‐impacted soils by amendment with drinking‐water treatment residuals

RoyChowdhury

Sarkar

Datta

2018

Remediation Journal

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Mining operations result in a wide range of environmental impacts: acid mine drainage (AMD) and acid sulfate soils being among the most common. Due to their acidic pH and high soluble metal concentrations, both AMD and acid sulfate soils can severely damage the local ecosystems. Proper post‐mining management practices are necessary to control AMD‐related environmental issues. Current AMD‐impacted soil treatment technologies are rather expensive and typically not environmentally sustainable. We conducted a 60‐day bench‐scale study to evaluate the potential of a cost‐effective and environment‐friendly technology in treating AMD‐impacted soils. The metal binding and acid‐neutralizing capacity of an industrial by‐product, drinking water treatment residuals (WTRs) were used for AMD remediation. Two types of locally generated WTRs, an aluminum‐based WTR (Al‐WTR) and a lime‐based WTR (Ca‐WTR) were used. Highly acidic AMD‐impacted soil containing very high concentrations of metals and metalloids, such as iron, nickel, and arsenic, was collected from the Tab‐Simco coal mine in Carbondale, Illinois. Soil amendment using a 1:1 Al‐ and Ca‐WTR mix, applied at 5 and 10 percent rates significantly lowered the soluble and exchangeable fractions of metals in the AMD‐impacted soil, thus lowering potential metal toxicity. Soil pH increased from an extremely acidic 2.69 to a near‐neutral 6.86 standard units over the 60‐day study period. Results from this preliminary study suggest the possibility of a successful scale‐up of this innovative, cost‐effective, and environmentally sustainable technology for remediating AMD‐impacted acid sulfate soils.

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Aluminium in Acid Soils: Chemistry, Toxicity and Impact on Maize Plants

Cited by 25 publications

References 50 publications

Assessment of the Binding of Protons, Al and Fe to Biochar at Different pH Values and Soluble Metal Concentrations

Assessment of the Binding of Protons, Al and Fe to Biochar at Different pH Values and Soluble Metal Concentrations

Genotypic Variation in Seedling Tolerance to Aluminum Toxicity in Historical Maize Inbred Lines of Zambia

Preliminary studies on potential remediation of acid mine drainage‐impacted soils by amendment with drinking‐water treatment residuals

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