Rapid Spectrophotometric Determination of Trace Amounts of Nitrate‐Nitrogen Using Dapsone and α‐Naphthol

Abstract

A simple, rapid and sensitive spectrophotometric method has been developed for the trace determination of nitrite using Dapsone and α-Naphthol. The proposed method is based on the diazotization of Dapsone followed by coupling with α-Naphthol in sodium hydroxide medium to give an intense pink coloured azo dye. The dye shows absorption maximum at 540 nm. The molar absorptivity and Sandell’s sensitivity being 5.749 × 104l mol-1cm-1and 0.24 ng cm-3respectively. Tolerance limit for interfering ions and complexing agents were reported. Other analytical parameters and applications of the method for analysis of tap water, lake water, and industrial effluents have been investigated.

Effectiveness of Using Zn Powder and Spongy Cadmium As Reductor on Free Nitrite and Nitrate Analysis Method Validation in Bread Samples by UV-Vis Spectrophotometry

“…Nagaraja conducted an analysis of nitrate in water using dapsone reagent (4.4-diamino diphenyl sulfone) with -naphthol [6]. The maximum wavelength obtained is 540 nm with a linearity produced at 0.05-0.8 O-aminobenzoic acid (OABA)/NEDA reagent has also been used as a reagent and has better tolerance for ionic interference [7].…”

New norfloxacin/nitric oxide donor hybrids: Synthesis and nitric oxide release measurement using a modified Griess colorimetric method

“…NO can be estimated by gas chromatography-mass spectrometry [14], chemiluminescence [15], or by fluorescent probes such as 4,5-diaminofluorescein [16], laser magnetic resonance spectroscopy [17], electrochemical methods [18] and capillary electrophoresis with laser induced fluorescence detection [19]. In addition, Griess colorimetric assay [20,21] and its modifications [22,23] represent the most commonly used methods for the analysis of NO in view of the simplicity and low cost. The method relies on indirect determination of NO via spectrophotometric measurement of its stable decomposition product NO2…”