Al-Okab, Riyad Ahmed and Syed, Akheel Ahmed (2009) Novel oxidative electrophilic coupling reactions of phenoxazine derivatives with MBTH and their applications to spectrophotometric determination of residual chlorine in drinking water and environmental water samples. JOURNAL OF HAZARDOUS MATERIALS, 170 (1). pp. 292-297. ISSN 1873-3336
Full text not available from this repository. (Request a copy)Abstract
Novel, sensitive and rapid spectrophotometric methods, using phenoxazine (PNZ), 2-chlorophe-noxazine (CPN) and 2-trifluoromethylphenoxazine (TPN) as chromogenic reagents for the determination of residual chlorine are proposed. The methods are based on the reduction of chlorine by an electrophilic coupling reagent, 3-methyl-2-benzothiazoline hydrazono hydrochloride hydrate (MBTH) in mild hydrochloric acid medium and subsequent coupling with PNZ, CPN or TPN. The blue color formed in the reaction showed maximum absorbance at 680-690 nm and obeyed Beer's law over the range 0.1-2.2 mu g ml(-1). The molar absorptivity values with PNZ, CPN and TPN were 2.80 x 10(4), 2.67 x 10(4) and 1.91 x 10(4) l mol(-1) cm(-1) and Sandell's sensitivity values were 0.028, 0.027 and 0.028 mu g cm(-2) respectively. The proposed methods were successfully applied in the determination of residual chlorine in drinking water and environmental water samples. The performance of proposed methods was evaluated in terms of Student's t-test and variance ratio F-test which indicated the significance of proposed methods over the standard spectrophotometric method. (C) 2009 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Spectrophotometry; Phenoxazines; Residual chlorine; Drinking water; MBTH |
| Subjects: | C Chemical Science > Chemistry |
| Depositing User: | Users 19 not found. |
| Date Deposited: | 14 Aug 2019 09:51 |
| Last Modified: | 14 Aug 2019 09:51 |
| URI: | http://eprints.uni-mysore.ac.in/id/eprint/6382 |
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