Ammonium saturated clay materials are thermally decomposed in the presence of oxygen forming the oxide of nitrogen, a component of the fixed ammonium ion on the exchange site of the clay material. Each sample requires two nitrogen determinations, one to provide a total nitrogen concentration and a second to provide a background nitrogen concentration. The background nitrogen is subtracted from the total nitrogen and provides an exchange nitrogen concentration from which the exchange capacity is calculated. In this paper the new combustion method is compared with the well-known Kjeldahl method.

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