Error caused by carbon dioxide in determination of ammonium by direct steam distillation of tropical wetland rice soils

    Sahrawat, K L (1982) Error caused by carbon dioxide in determination of ammonium by direct steam distillation of tropical wetland rice soils. Plant and Soil, 69 (2). pp. 283-285. ISSN 0032-079X

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    Abstract

    Abstract A study was made with eight Philippine wetland rice soils to quantify the possible error caused by the CO2 evolved during direct distillation of soil suspensions in aerobic and anaerobic conditions with MgO. The error caused by CO2 was eliminated by absorbing the ammonia distilled in H2SO4, which was gently boiled to derive off the CO2 absorbed. The possible error caused by CO2 was not eliminated when boric acid was used for absorbing ammonia. The difference in NH4 + values determined by using sulfuric acid and boric acid methods gave an estimate of the error caused by CO2. It was found that CO2 evolved caused negative error in the NH4 + values obtained using the direct distillation of soil suspensions with MgO in presence of KCl. The magnitude of error was higher and significant with anaerobic soil samples but this error was negligible with aerobic soils.

    Item Type: Article
    Divisions: UNSPECIFIED
    CRP: UNSPECIFIED
    Uncontrolled Keywords: Ammonia absorption by sulfuric acid - Boric acid - CO2 exclusion
    Subjects: Others > Soil Science
    Depositing User: Mr Sanat Kumar Behera
    Date Deposited: 17 Nov 2011 04:14
    Last Modified: 23 Jan 2012 08:09
    URI: http://oar.icrisat.org/id/eprint/4002
    Official URL: http://dx.doi.org/10.1007/BF02374523
    Projects: UNSPECIFIED
    Funders: International Rice Research Institute
    Acknowledgement: This work was supported by the International Rice Research Institute, Los Bafios, Philippines under a post-doctoral fellowship: I am grateful to Dr. F. N. Ponnamperuma, Principal Soil Chemist for valuable suggestions during planning of the work and preparation of the manuscript.
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