Spectrophotometric determination of aluminium with chlorophosphonazo I.
Aluminium reacts with Chlorophosphonazo I at pH 4-6 to form a water-soluble 1:1 red-violet complex. The absorption maximum is at 610 nm and the apparent molar absorptivity is 1.96 x 10(4) l.mole(-1).cm(-1). The apparent instability constant has been calculated to be 1.8 x 10(-4). The colour of the complex is stable for 24 hr. Beer's law is obeyed over the concentration range up to 0.8 mug ml . Titanium and zirconium interfere seriously.
Ying-Quan
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Department of Chemistry, Huazhong Normal College, Wuchang Gui-zi Shan, Wuhan, China.
Lin
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Jun-Yi
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