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Molecular and Equivalent Weights of the Organic Matter of a Podzol¹

ABSTRACT

The number-average molecular weights of the organic matter of the A₀ and B_h horiozons of a Podzol, determined by freezing point depression in sulfolane, were 1684 and 669, respectively. From the molecular weights, in conjunction with ultimate and functional group analyses, molecular formulae were calculated. These were C₇₅H₃₃O₁₇N₃ (COOH)₃(OH)₁₂(CO)₂ for the A₀ and C₂₁H₁₂(COOH)₆(OH)₅(CO)₂ for the B_h organic matter. The presence of relatively large numbers of functional groups in the B_h molecule offers interesting possibilities for metallo-organic interactions.

The equivalent weights of the same organic matter preparations, measured by discontinuous potentiometric titrations, were 165 for the A₀ and 76 for the B_h organic matter. The ratio of molecular to equivalent weight was 10 for the A₀ and 9 for the B_h material. These ratios were in both cases equal to the sum of carboxyl plus phenolic hydroxyl groups in the two molecules.

¹ Contribution No. 36 of the Soil Research Institute, Research Branch, Canada Department of Agriculture, Ottawa, Ont.

² Research Officer and Technician, respectively.

Received for publication July 5, 1961. Accepted for publication October 9, 1961.

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