Resumo
This paper describes the determination of exchangeable calcium and magnesium in soil by using ethylenediamine tetracetic acid, after the separation of the principals interferents (iron, aluminum, manganese and phosphate) by using both ammonium hidroxide and ammonium sulfide in only one operation. In order to compare the chelometric and the permanganometric methods for determining exchangeable calcium, five replications of nine soils were analysed by both methods. The accuracy of the determination of exchangeable magnesium in soil was evalueted by means of the recovered magnesium, when the proposed method was applied. The data obtained in both studies allowed to conclude that the technique proposed is good and the accuracy is satisfactory.
Método do EDTA na determinação do cálcio e magnésio "trocável" do solo
N. A. da Glória; R. A. Catani; T. Matuo * * Bolsista do Conselho Nacional de Pesquisas.
SUMMARY
This paper describes the determination of exchangeable calcium and magnesium in soil by using ethylenediamine tetracetic acid, after the separation of the principals interferents (iron, aluminum, manganese and phosphate) by using both ammonium hidroxide and ammonium sulfide in only one operation.
In order to compare the chelometric and the permanganometric methods for determining exchangeable calcium, five replications of nine soils were analysed by both methods.
The accuracy of the determination of exchangeable magnesium in soil was evalueted by means of the recovered magnesium, when the proposed method was applied.
The data obtained in both studies allowed to conclude that the technique proposed is good and the accuracy is satisfactory.
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LITERATURA CITADA
- CATANI, R. A. & A. KUPPER, 1949 - As formas "trocáveis" e "fixa" dos cátions K, Ca e Mg nos solos do Estado de São Paulo,. Bragantia, 9:185-192.
- CATANI, R. A. & J. R. GALLO, 1951 - A extração do manganês e suas formas de ocorrência em alguns solos do Estado de São Paulo. Bragantia 11:255-266.
- CATANI, R.A., J. ROMANO GALLO & H. GARGANTINI, 1955 - Amostragem de solo, métodos de análise, interpretação e indicações gerais para fins de fertilidade. São Paulo, Instituto Agronômico de Campinas (Boletim n,° 69).
- CHENG, K. L. & R. H. BRAY, 1951 - Determination of Calcium and Magnesium in Soil and Plant Material. Soil Sci. 72:449-558.
- CHENG, K. L., S. W. MELSTED & R. H. BRAY, 1953 - Removing Interfering Metals in the Versenate Determination of Calcium and Magnesium. Soil Sci. 75:37-40.
- ITO, M. & K. INAMATSU, 1955 - The Determination of Exchangeable Calcium and Magnesium in soils by the use of Versene, J. Sci. Soil, Manure Japan, 25:197.202 (original não consultado, citado em Chemical Abstracts 49:7165 - 1955).
- SAIZ DEL RIO, J. F. & E. BORNEMISZAS, 1961 - Analisis Químico de Suelos. Turrialba, Costa Rica. Centro Tropical de Investigación y Enseñanza. Instituto Interamericano de Ciências Agrícolas de la OEA. 95 pp.
- SCHWARZENBACH, G., W. BIEDERMAN & F. BANGERTER, 1946 - Komplexone VI. Neue einfache Tritriermethoden zur Bestimmung der Wasserhärt. Helv. Chim. Acta 29:811-818.
Datas de Publicação
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Publicação nesta coleção
27 Jun 2012 -
Data do Fascículo
1964
