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PHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF NICKEL WITH o-CARBOXYBENZENEDIAZOAMINOAZOBENZENE IN HYDROGENATED OIL

Yu Xue, Pan Jiao

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Abstract

A method for the photometric determination of trace amounts of nickel in hydrogenated oil was proposed. In a borate buffer solution of pH 9.2, nickel(Ⅱ) reacts with o carboxybenzenediazoaminoazobenzene to form a 1∶3 red colored complex, which has an absorption maxima at 540nm, and an apparent molar absorptivity of 3 3×10 5L·mol -1 ·cm -1 . Beer′s law is obeyed in the concentration range of 0～0.24μg·ml -1 of nickel(Ⅱ). Ca 2+ ? Mg 2+ ? K + and Na + etc do not interfere with the color reaction. The present method can be directly used in the determination of nickel in edible hydrogenated oil and is proved to be sensitive and selective.

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What this paper is about

A method for the photometric determination of trace amounts of nickel in hydrogenated oil was proposed. In a borate buffer solution of pH 9.2, nickel(Ⅱ) reacts with o carboxybenzenediazoaminoazobenzene to form a 1∶3 red colored complex, which has an absorption maxima at 540nm, and an apparent molar absorptivity of 3 3×10 5L·mol -1 ·cm -1 . Beer′s law is obeyed in the concentration range of 0～0.24μg·ml -1 of nickel(Ⅱ). Ca 2+ ? Mg 2+ ? K + and Na + etc do not interfere with the color reaction. The present method can be directly used in the determination of nickel in edible hydrogenated oil and is proved to be sensitive and selective.

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Available abstract

A method for the photometric determination of trace amounts of nickel in hydrogenated oil was proposed. In a borate buffer solution of pH 9.2, nickel(Ⅱ) reacts with o carboxybenzenediazoaminoazobenzene to form a 1∶3 red colored complex, which has an absorption maxima at 540nm, and an apparent molar absorptivity of 3 3×10 5L·mol -1 ·cm -1 . Beer′s law is obeyed in the concentration range of 0～0.24μg·ml -1 of nickel(Ⅱ). Ca 2+ ? Mg 2+ ? K + and Na + etc do not interfere with the color reaction. The present method can be directly used in the determination of nickel in edible hydrogenated oil and is proved to be sensitive and selective.

Key concepts: Molar absorptivity, Nickel, Trace Amounts, Chemistry, Absorption (acoustics), Color reaction, Spectrophotometry, Boron

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PHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF NICKEL WITH o-CARBOXYBENZENEDIAZOAMINOAZOBENZENE IN HYDROGENATED OIL — Research Paper | ScholarLens