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Under the buffer medium of HAc-NaAc of pH = 6.00, Fe(III) and 4-(5-chloro-2-pyridylazo)-1, 3-Diaminobenzene form a colored complex which can be quantitatively absorbed on the strong acid cation exchange resin, and the amount of trace Fe(III) is determined by spectrophotometry. The maximum absorption wavelength is at 540 nm, the apparent molor absorptivity(More)
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