Reference

Studies on the chelating agent-impregnated resins for the adsorption and separation of metal ions (II)

Studies on the chelating agent-impregnated resins for the adsorption and separation of metal ions (II). 5,7-Dihalo-8-hydroxyquinoline(DXHQ)-impregnated resins. Lee, Dai Woon; Eum, Chul Hun; Chung, Yoon Soon; Park, Kyu Chang (Dep. Chem., Yonsei Univ., Seoul 120, S. Korea). Taehan Hwahakhoe Chi, 28(6), 403-11 (Korean) 1984. CODEN: DHWHAB. ISSN: 0418-2472. DOCUMENT TYPE: Journal CA Section: 37 (Plastics Manufacture and Processing) Amberlite XAD-7 [37380-43-1] and XAD-4 [37380-42-0] resins impregnated with DXHQ (X = Cl, Br, or I; represented by C, B, and I, resp., in DXHQ) were prepd. for adsorption, sepn., and recovery of heavy metal ions from aq. solns., and the characteristics of the impregnated resins were studied to det. the optimum resin-DXHQ pairs for adsorption of metal ions. The impregnated amt. of DXHQ on XAD-7 increased in the order: DCHQ [773-76-2] < DBHQ [521-74-4] < DIHQ [83-73-8]. The optimum pH range for adsorption of DIHQ onto XAD-4 was 3.0-7.0. The stabilities of the impregnated resins were investigated by detg. the amt. of DXHQ remaining on the resin after shaking with various solns. having pH 2-12 and HCl solns.; the impregnated resins exhibited considerable stability in acidic and neutral solns. The amt. of DIHQ leached from XAD-4 by elution with 1-5 M HCl solns. was negligible, but, in the case of XAD-7, the amt. increased with concn. of HCl in the soln. The optimum pH ranges, metal-DXHQ ratios, and adsorption capacities for metal ion adsorption onto the impregnated resins were detd. The stability of the metal ion adsorbed by the DXHQ-XAD-7 pair was as follows: DCHQ < DBHQ < DIHQ. The adsorbed metal ions were quant. recovered by elution with 0.5-5 M HCl, and the impregnated resins could be reused >5 times without reimpregnation.

Use of 2,6-dichloroquinone chlorimide for the spectrophotometric determination of halogenated derivatives of 8-hydroxyquinoline

Use of 2,6-dichloroquinone chlorimide for the spectrophotometric determination of halogenated derivatives of 8-hydroxyquinoline. Belal, Fathalla (Dep. Anal. Chem., Univ. Mansoura, Mansoura, Egypt). Analyst (London), 109(5), 615-18 (English) 1984. CODEN: ANALAO. ISSN: 0003-2654. DOCUMENT TYPE: Journal CA Section: 64 (Pharmaceutical Analysis) A spectrophotometric procedure is described for the detn. of 8-hydroxyquinoline [148-24-3] and 3 of its halogenated derivs.: clioquinol [130-26-7], iodoquinol [83-73-8], and chiniofon [8002-90-2]. The proposed method involves the use of 2,6-dichloroquinone chlorimide [101-38-2] as the chromogenic reagent. 8-Hydroxyquinoline produces a blue color peaking at 595 nm and the other compds. yield a green-blue color with max. absorption at 650 nm. The colors produced obey Beer's law. The procedure was applied to the detn. of the compds. in dosage forms.