Inclusion of nitrate and nitrite in the Kjeldahl nitrogen determination of soils and plant materials using sodium thiosulphate

Dalai, R C and Sahrawat, K L and Myers, R J K (1984) Inclusion of nitrate and nitrite in the Kjeldahl nitrogen determination of soils and plant materials using sodium thiosulphate. Communications in Soil Science and Plant Analysis, 15 (12). pp. 1453-1461. ISSN 0010-3624

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Abstract

Sodium thiosulphate was used in a modification of the regular Kjeldahl method for the determination of total N in soil and plant samples containing NO‐ 3‐N and NO‐ 2‐N. Quantitative recoveries of added 15N‐labelled and unlabelled N0‐ 3‐N (1000 μg N), NO‐ 2‐N (500 μg N), and NO‐ 3‐N (500 μg N) + N0‐ 2‐N (250 μg N) were obtained from soils, plant materials and adenine, even in the presence of water (up to 50 ml H?0/sample) when 5 g of Na2S203.5H20 as 25% aqueous solution was added to each sample before digestion. Moreover, this procedure does not require additional pretreatment of samples as does the salicylic acid‐sodium thiosulphate or KMnO4‐Fe modification of the Kjeldahl method, and therefore saves considerable time.

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Subjects:	Others > Soil Science
Depositing User:	Mr Sanat Kumar Behera
Date Deposited:	30 Nov 2011 06:13
Last Modified:	30 Nov 2011 06:13
URI:	http://oar.icrisat.org/id/eprint/4526
Official URL:	http://dx.doi.org/10.1080/00103628409367572
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	UNSPECIFIED
Links:	Author

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