Determination of soil nitrate by transnitration of salicylic acid

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Abstract
Colorimetric determination of soil NO3‐N by transnitration of salicylic acid was compared to an automated cadmium reduction and specific ion electrode methods. Soils from 155 locations across the Great Plains were extracted and analyzed for NO3‐N by each method. Nitrate concentrations in the soils ranged from 1 to 2 34 mg NO3‐N/kg. Almost identical results were obtained by salicylic acid and cadmium reduction methods. Linear regression of NO3‐N determined by salicylic acid and cadmium reduction produced a R2 of 0.994. Nitrite was not detected in soils used for this study. The specific ion electrode method gave significantly lower NO3‐N values than the two other methods. Linear regression of NO3‐N determined by salicylic acid and the electrode method produced a R2 of 0.985. Transnitration of salicylic acid is a fast method for determination of soil NO3‐N that returns nearly identical results as automated cadmium reduction.

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