Interference by magnesium in the determination of nitrate in 2 M KCl extracts of soil by steam distillation
- 11 November 1985
- journal article
- research article
- Published by Taylor & Francis in Communications in Soil Science and Plant Analysis
- Vol. 16 (11) , 1189-1198
- https://doi.org/10.1080/00103628509367676
Abstract
Steam distillation of 2 M KCl extracts of soil showed low recovery of NO3‐N when compared with an automated method for NO3‐N determination. The low recoveries were more pronounced in extracts where a soil:solution ratio of 1:2.5 had been used. In extracts where the Mg2+ content was in excess of 0.02 M Mg, recoveries of added NO3‐N could be as low as 25%. Increasing the amount of Devarda's alloy or using a 1:10 soil:solution extraction ratio overcame the problem of low NO3‐N recovery. Calcium salts did not interfere in the recovery of added NO3‐N.Keywords
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