DETERMINATION OF CARBONATE CONTENT OF SOILS AND CLAYS BY USING CO_2 DETECTOR TUBE : IMPROVEMENT OF THE METHOD AND SOME APPLICATIONS
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概要
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We improved the method for determination of carbonate in soils and clays (Wada (1997) Soil Sci. Plant Nutr., 43, 45-50). A sample was placed in a flexible gas-tight plastic bag attached with stopcock and heat-sealed. The carbonate in the sample was decomposed by addition of HCl and the generated CO_2 was diluted by injecting a known amount of air followed by determination of the CO_2 concentration of the gas in the bag. The carbonate content of the sample was calculated by summing the amount of gaseous and dissolved CO_2, the latter of which was estimated with the aid of Henry's law. A series of test using standard carbonate minerals showed a 20min of digestion was sufficient for complete dissolution. The improved method was applied to some clays and soil samples. Some Japanese soils from greenhouses contained about 0.08 to 0.35mol kg^<-1> of carbonate, while their soil pH values were significantly lower than those expected from carbonate equilibrium.
著者
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THAN AYE
Faculty of Agriculture, Kyushu University
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SHOJI KAZUYUKI
Faculty of Agriculture, Kyushu University
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WADA SHIN-ICHIRO
Faculty of Agriculture, Kyushu University
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Than Aye
Faculty Of Agriculture Kyushu University
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Shoji Kazuyuki
Faculty Of Agriculture Kyushu University
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Wada Shin‐ichiro
Kyushu Univ. Fukuoka Jpn
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Wada Shin-ichiro
Faculty Of Agriculture Kyushu University
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