Spectrophotometric Determination of Trace Amount of Nitrite in Water with p-Nitroaniline and 1-Naphthol

Authors

  • Deba Bahadur Khadka Central Department of Chemistry, T.U., Kirtipur, Kathmandu
  • Laxmi Pachhai Department of Chemistry, Tri-Chandra Multiple Campus, T.U., Kathmandu

DOI:

https://doi.org/10.3126/jist.v19i2.13859

Keywords:

p-Nitroaniline, 1-naphthol, spectrophotometric, molar absorptivity, nitrite

Abstract

A simple, selective and sensitive method for the spectrophotometric determination of nitrite in different natural and waste water samples is applied. Nitrite reacts with p-nitroaniline in the presence of hydrochloric acid to form diazonium cation which is subsequently coupled with 1-naphthol to form a stable azo dye. The ?max for the azo dye is found to be 610 nm. At analytical wavelength 610 nm the Lambert-Beer’s law obeys over the concentration range 0.035-0.123 ?g/ml of nitrite. The correlation coefficient, molar absorptivity and Sandell’s sensitivity of the method were found to be 0.99, 5.24×104 lit.mol-1cm-1 and 8.77×10-4?g cm-2 respectively. The percentage recovery was found to range from 93-109% and the interference of foreign ions was also studied.

Journal of Institute of Science and Technology, 2014, 19(2): 89-93

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Published

2015-11-09

How to Cite

Khadka, D. B., & Pachhai, L. (2015). Spectrophotometric Determination of Trace Amount of Nitrite in Water with p-Nitroaniline and 1-Naphthol. Journal of Institute of Science and Technology, 19(2), 89–93. https://doi.org/10.3126/jist.v19i2.13859

Issue

Vol. 19 No. 2 (2014)

Section

Research Articles

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