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A new sensitive chromogenic reagent, 2-[(5-nitro-2-pyridyl)azo]-5-dimethylaminobenzoic acid (5-N02-PAMB), was synthesized and applied to the determination of nickel in aqueous solutions. This sensitive chromogenic reagent has a molar absorptivity (E) of 1.64X 1051 mol-' cm-1 to nickel, and has excellent solubility in water. The reaction requires no heat or organic solvent. The reagent can react immediately with nickel at room temperature to form a blue complex with maximum wavelength of 631.2doi:10.2116/analsci.7.451 fatcat:x6hsqjrwtvacnowej23rq6anzq