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Orthogonal design methocl,based on the formation of a yellow complex of lead(Ⅱ) with α、β、γ、δ-Trtra(p-sulfopheny 1) Porphine in the pH10.2 H3BO3-NaOH buffer selution,has been proposed.The maximum absorption wavelength (λmax) is 464nm.The molar absorption c