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Study on Spectrophotometric Determination of Nickel(II) with 2-(2-Quinolinylazo)-4-Diethylaminobenzoic Acid

Hu Qiu

Abstract

Quinolinylazo)-4-Diethylaminobenzoic Acid(QADEABA) has been synthesized, and its color reaction with nickel(Ⅱ) is studied. At the condition of pH=8.0 buffer solution, QADEABA can react with nickel(Ⅱ) to form a stable 2∶1 complex in the medium of Tween-80. The molar absorptivity is 1.18×10\+5 L·mol\+\{-1\}·cm\+\{-1\} at 590 nm. Beer's law is obeyed in the range of 0～0.4 mg/L. This method can be applied to the determination of nickel in water with satisfactory results.

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Key concepts: Molar absorptivity, Nickel, Chemistry, Color reaction, Spectrophotometry, Buffer solution, Nuclear chemistry, Analytical Chemistry (journal)