Novel reactions for simple and sensitive spectrophotometric determination of nitrite

Al-Okab, Riyad Ahmed and Syed, Akheel Ahmed (2007) Novel reactions for simple and sensitive spectrophotometric determination of nitrite. Talanta, 72 (4). 1239 - 1247. ISSN 1873-3573

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Nine spectrophotometric methods based on new reactions for the determination of tracer amounts of nitrite in environmental samples were developed. Replacement of toxic reagents was explored to attain the standards of clean chemistry. These methods utilize two classes of compounds namely; phenoxazines and sulphonamides, the well established drugs in the presence of limited amounts of hydrochloric acid. The methods were based on the oxidation of sulfanilamide (SAA), sulfadoxine (SDX) or sulfamethoxazole (SMX) by nitrite in hydrochloric acid medium and coupling with phenoxazine (PNZ), 2-chlorophenoxazine (CPN) or 2-trifluoromethylphenoxazine (TPN) which yielded red colored derivatives having an absorbance maximum in the range 530–540nm and were stable for about 4h. Beer's law was obeyed for nitrite in the concentration range 0.13–1.60μgmL−1. The reaction conditions and other important analytical parameters were optimized to enhance the sensitivity of the methods. Interference if any, by non-target ions was also investigated. The methods were applied determining nitrite in environmental samples. The performance of these methods were evaluated in terms of Student's t-test and variance ratio F-test to find out the significance of proposed methods over the reference spectrophotometric method.

Item Type: Article
Uncontrolled Keywords: Spectrophotometry, Nitrite, Sulphonamides, Phenoxazines, Environmental samples
Subjects: C Chemical Science > Chemistry
Divisions: Department of > Chemistry
Depositing User: C Swapna Library Assistant
Date Deposited: 16 Sep 2019 05:31
Last Modified: 16 Sep 2019 05:31

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