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The reaction behaviour of the β-type chelates of lanthanide ions (Ln 3+ ) with p-bromochloroarsenazo (4-CAsA-pB) in 0.01 mol 1 -1 HClO 4 solution has been studied systematically by a spectrophotometric method. All the lanthanide ions can form β-type chelates with p-bromochloroarsenazo. The maximum absorption wavelength is in the range 727-731 nm, the molar absorptivities...
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