Flow injection analysis (FIA) is a relatively new technique with advantages over traditional automated analysis methods in precision and sample throughput. A new procedure has been developed to measure urea in soil extracts using automated FIA. This procedure utilizes the diacetyl monoxime thiosemicarbazide colorimetric method, with a modified acid reagent that increases the rate of color formation and improves the mixing of sample with reagent in narrow‐diameter (0.8‐mm) tubing. Sixty samples can be analyzed per hour, with a detection limit of 0.01 mg urea‐N L −1 . Residence time between sample injection and maximum absorbance is 130 s.
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Sullivan et al. (1991) studied this question.
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