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  • Title: [Measurement of aluminum (III) in crops by synergistic chromatic reaction].
    Author: Liu W, Ma W, Yu R.
    Journal: Guang Pu Xue Yu Guang Pu Fen Xi; 1999 Oct; 19(5):760-2. PubMed ID: 15822289.
    Abstract:
    In the presence of OP, a sensitive color reaction of aluminum (III) on pyrocatechol violet and rhodamine 6G has been studied. In a NH4Ac-HAc (pH = 6.5) medium, aluminum (III) ions form an ions-associate complex with pyrocatechol violet and rhodamine 6G. The composition of the complex is Al (III) : PV: Rh6G = 1 : 2 : 4. The maximum absorption of the ions-associate complex is at 580 nm with an apparent molar absorptivity of 6.8 x 10(4) L x mol(-1) x cm(-1). Beer's law is obeyed in the range of 0-7 microg/25 mL of aluminum. The method is highly selective and has been applied to the determination of trace aluminum in crops with satisfactory results.
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