CONSTRUCTION OF A SELECTIVE OPTICAL SENSOR FOR NITRITE BASED ON THE GRIESS REACTION | Journal of...

A new optical sensor for measuring nitrite ions has been created. The diazotization-coupling reaction of nitrite by 3-nitroaniline and 1-naphthylamine in hydrochloric acid solution at pH 1.4 is the basis of the approach (Griess reaction). In the membrane, the final product absorbs the most at 346 nm. The sensor's reaction characteristics were investigated, including its response mechanism, pH of solution, repeatability and reproducibility, response time, and selectivity. Central composite design was used to optimise the conditions for fabricating the membrane and its function (CCD). The mass ratio of 3-nitroaniline to 1-naphthylamine as reagents, mass of oleic acid as an additive ingredient in membrane construction, and solution pH were tuned. The univariate calibration curve was linear throughout the nitrite concentration range of 0.10–4.00 mg L1. The detection limit of the nitrite measurement method was 9.510-2 mg L1. The sensor was able to detect nitrite in tap and wastewater samples. The percent relative standard deviation (RSD percent) of the approach was found to be low in the analysis of real samples, with percent recoveries ranging between 103 and 108 percent.

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