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Published in J Environ Qual 1:423-425 (1972)
© 1972 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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A Simple Digestion Procedure for Estimation of Total Nitrogen in Soils and Sediments1

D. W. Nelson and L. E. Sommers2

ABSTRACT

A simple and convenient digestion procedure for total N analysis of soils and sediments is described. The digestion is carried out in pyrex Folin-Wu tubes heated in an aluminum block placed on a hot plate. Samples up to 1 g in size may be used and a digestion time of 3 hours after clearing is adequate. The proposed and conventional semimicro-Kjeldahl methods gave essentially the same values for total N in a wide variety of soils and sediments. The precision of the proposed method was almost as good as those reported for other semimicro-Kjeldahl methods. The tube digestion method allows simultaneous digestion of 60 samples in a relatively inexpensive and maintenance-free aluminum heating block, which occupies a minimum of laboratory space and appears applicable for routine determination of total N in soils having diverse properties.

Key Words: Kjeldahl • steam distillation • hydrofluoric acid

NOTES

1 A contribution of the Agricultural Experiment Sta., Purdue Univ., Lafayette, Ind. Purdue Journal Pap. No. 4653.

2 Assistant Professors of Agronomy, Dep. of Agron., Purdue Univ., Lafayette, Ind. 47907.

Received for publication January 20, 1972.


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