Analytical Sciences

Synergistic Cloud Point Extraction Behavior of Aluminum(III) with 2-Methyl-8-quinolinol and 3,5-Dichlorophenol

Akira OHASHI, Akira TSUGUCHI, Hisanori IMURA, and Kousaburo OHASHI

Department of Environmental Sciences, Faculty of Science, Ibaraki University, Mito, Ibaraki 310-8512, Japan

The cloud point extraction behavior of aluminum(III) with 8-quinolinol (HQ) or 2-methyl-8-quinolinol (HMQ) and Triton X-100 was investigated in the absence and presence of 3,5-dichlorophenol (Hdcp). Aluminum(III) was almost extracted with HQ and 4(v/v)% Triton X-100 above pH 5.0, but was not extracted with HMQ-Triton X-100. However, in the presence of Hdcp, it was almost quantitatively extracted with HMQ-Triton X-100. The synergistic effect of Hdcp on the extraction of aluminum(III) with HMQ and Triton X-100 may be caused by the formation of a mixed-ligand complex, Al(dcp)(MQ)₂.

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