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This article in SSSAJ

  1. Vol. 36 No. 1, p. 175-176
    Received: Sept 6, 1971
    Accepted: Oct 20, 1971

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Evaluation of a Reductiometric Titration Method for Determining Quinones in Soil Humus1

  1. S. P. Mathur2



A SnCl2-I2 reductometric titration method gave values of 4.2 and 3.5 meq quinoid carbonyls/g in a soil fulvic (FA) and humic acid, respectively. The results were supported by the analysis of a mixture of the FA and a napthaquinone, and were in agreement with earlier enzymatic and infrared studies of the soil humic compound. No reduction of the nonquinoid carbonyl of benzophenone by SnCl2 was observed.

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