Method for Assessing Zinc Status of Soils Using Acid-Extractable Zinc and “Titratable Alkalinity” Values

RESUMOAs conseqüências da deficiência ou toxidez de micronutrientes na produção agrícola do estado do Rio de Janeiro são pouco conhecidas. Desta forma, em 1997, foram quantificados os teores de cobre, zinco, ferro e manganês em 103 amostras de horizontes superficiais de solos representativos do estado, sendo utilizados os extratores Mehlich-1, DTPA-TEA e HCl 0,1 mol L -1 . De maneira geral, o extrator HCl 0,1 mol L -1 foi o que apresentou maior poder de extração dos micronutrientes estudados, tendo o Mehlich-1 extraído as menores quantidades de cobre e ferro e o DTPA-TEA as menores quantidades de zinco e manganês. Segundo os resultados, equações de conversão entre extratores, para um mesmo elemento, e a utilização de faixas de interpretação desenvolvidas para regiões edáficas diferentes das condições do trabalho podem não estimar corretamente a disponibilidade dos micronutrientes às plantas.Termos de indexação: micronutrientes, fertilidade dos solos, extratores.

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“…Solução de HCl 0,1 mol L -1 : 10 g de solo e 50 mL de solução extratora, cinco minutos de agitação, seguida de filtragem (Nelson et al, 1959).…”

Section: Methodsunclassified

Comparação de métodos de extração de cobre, zinco, ferro e manganês em solos do estado do Rio de Janeiro

Pereira

Pérez

Valladares

et al. 2001

Rev. Bras. Ciênc. Solo

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“…HCl (Nelson et al, 1959), extraction as stipulated by the Agricultural Land-Soil Pollution Prevention Law in Japan. Leaf color, as a SPAD value, was analyzed using a hand-held optical sensor (SPAD-502; Konica Minolta Inc., Tokyo, Japan) after flowering time.…”

Section: Chemical Analysesmentioning

confidence: 99%

Reducing Cadmium Accumulation in Fresh Pepper Fruits by Grafting

Morikawa

2017

Hortic J

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“…42) and analyzed for Cd, Cr, Cu, Ni, Pb, and Zn by an inductively coupled plasma-atomic emission spectrometer (ICP-AES). The reactive metal pool was measured by three reagents: (1) 0.43 M HNO 3 (Houba et al 1997), (2) 0.1 M HCl (Nelson et al 1959), and (3) 0.05 M EDTA in the Na form (Na 2 -EDTA·2H 2 O; Tiwari and Kumar 1982). All extractions were performed at a soil to solution ratio of 1:10 (w/v) for 1 h. After shaking, all extracts were filtered (Whatman no.…”

Section: Soil Pretreatment and Chemical Analysesmentioning

confidence: 99%

Characterization of soil heavy metal pools in paddy fields in Taiwan: chemical extraction and solid-solution partitioning

et al. 2009

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Background, aim, and scope Ongoing industrialization has resulted in an accumulation of metals like Cd, Cu, Cr, Ni, Zn, and Pb in paddy fields across Southeast Asia. Risks of metals in soils depend on soil properties and the availability of metals in soil. At present, however, limited information is available on how to measure or predict the directly available fraction of metals in paddy soils. Here, the distribution of Cd, Cu, Cr, Ni, Zn, and Pb in 19 paddy fields among the total, reactive, and directly available pools was measured using recently developed concepts for aerated soils. Solid-solution partitioning models have been derived to predict the directly available metal pool. Such models are proven to be useful for risk assessment and to derive soil quality standards for aerated soils. , and directly available metal pools (0.01 M CaCl 2 ) were determined. Solid-solution partitioning models were derived by multiple linear regressions using an extended Freundlich equation using the reactive metal pool, pH, and the cation exchange capacity (CEC). The influence of Zn on metal partitioning and differences between both sampling events (May/November) were evaluated. Results Total metals contents range from background levels to levels in excess of current soil quality standards for arable land. Between 3% (Cr) and 30% (Cd) of all samples exceed present soil quality standards based on extraction with AR. Total metal levels decreased with an increasing distance from the irrigation water inlet. The reactive metal pool relative to the total metal content is increased in the order Cr << Ni = Zn < Pb < Cu < Cd and ranged from less than 10% for Cr to more than 70% for Cd. Despite frequent redox cycles, Cd, Pb, and Cu appear to remain rather reactive. The methods to determine the reactive metal pool in soils yield comparable results, although the 0.43 M HNO 3 extraction is slightly stronger than HCl and EDTA. The close correlation between these methods suggests that they release similar fractions from soils, probably those reversibly sorbed to soil organic matter (SOM) and clay. The average directly available pool ranged from less than 1% for Cu, Pb, and Cr to 10% for Ni, Zn, and Cd when compared to the reactive metal pool. For Cd, Ni, Zn, and to a lesser extent for Cu and Pb, solid-solution partitioning models were able to explain up to 93% (Cd) of the observed variation in the directly available metal pool. CaCl 2 extractable Zn increased the directly available pool for Ni, Cd, and Cu but not that of Pb and Cr. In the polluted soils, the directly available pool was higher in November compared to that in May. Differences in temperature, rainfall, and changes in soil properties such as pH are likely to contribute to the differences observed within the year. The solid-solution partitioning model failed to explain the variation in the directly available Cr pool, probably because Cr is present in precipitates rather than being adsorbed onto SOM and clay. Despite obvious differences in parent material, source of pollu...

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Method for Assessing Zinc Status of Soils Using Acid-Extractable Zinc and “Titratable Alkalinity” Values

Cited by 75 publications

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Comparação de métodos de extração de cobre, zinco, ferro e manganês em solos do estado do Rio de Janeiro

Comparação de métodos de extração de cobre, zinco, ferro e manganês em solos do estado do Rio de Janeiro

Reducing Cadmium Accumulation in Fresh Pepper Fruits by Grafting

Characterization of soil heavy metal pools in paddy fields in Taiwan: chemical extraction and solid-solution partitioning

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