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ANILINE-α-NAPHTHOL SPECTROPHOTOMETRIC DETERMINATION OF NITRITE IN WATER SAMPLE

Zhang Yin-ru

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Abstract

The content of nitrite in water sample was determined with aniline-α-naphthol spectrophotometry based on the principle that aniline and nitrite were diazotized in medium of hydrochloric acid, then formed orange color production in alkaline medium coupled with α-naphthol. The results showed the maximum absorption wavelength of orange color production was 480 nm, the linear range was 0～0.96 mg/L, the coefficient related to linear regression equation was r=0.997 6,the apparent molar absorptivity was 2.53×10~3 L/(mol·cm), and the lowest detection limit was 0.08 mg/L. It can be applied to determine nitrite in water sample.

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What this paper is about

The content of nitrite in water sample was determined with aniline-α-naphthol spectrophotometry based on the principle that aniline and nitrite were diazotized in medium of hydrochloric acid, then formed orange color production in alkaline medium coupled with α-naphthol. The results showed the maximum absorption wavelength of orange color production was 480 nm, the linear range was 0～0.96 mg/L, the coefficient related to linear regression equation was r=0.997 6,the apparent molar absorptivity was 2.53×10~3 L/(mol·cm), and the lowest detection limit was 0.08 mg/L. It can be applied to determine nitrite in water sample.

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Available abstract

The content of nitrite in water sample was determined with aniline-α-naphthol spectrophotometry based on the principle that aniline and nitrite were diazotized in medium of hydrochloric acid, then formed orange color production in alkaline medium coupled with α-naphthol. The results showed the maximum absorption wavelength of orange color production was 480 nm, the linear range was 0～0.96 mg/L, the coefficient related to linear regression equation was r=0.997 6,the apparent molar absorptivity was 2.53×10~3 L/(mol·cm), and the lowest detection limit was 0.08 mg/L. It can be applied to determine nitrite in water sample.

Key concepts: Molar absorptivity, Nitrite, Chemistry, Aniline, Spectrophotometry, Hydrochloric acid, Detection limit, Orange (colour)

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