DETERMINING THE CONTENT OF NITRATE IN SOME VEGETABLES BY THE SPECTROPHOTOMETRIC METHOD USING SALISYLIC ACID REAGENT

Abstract

The article investigated the appropriate conditions for the determination of
nitrate by the photometric method using salicylic acid reagent: wavelength 410
nm, coloration time 20 - 30 minutes, volume of salisilic acid solution 5% is 0.4 -
1ml, pH is 12 - 14. The method has a linear concentration range of 0.2ppm to
1.00ppm. The method has good repeatability (RSD = 2,87%; n = 10), low
detection limit and low quantification (LOD = 0.012ppm, LOQ = 0.041ppm). The
method was applied to the nitrate content analysis in some vegetables in Ha Noi
area for good results.