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Liquid–liquid extraction of chromium(VI) from chromic acid solutions with triisooctylamine (tris(6-methylheptyl)amine, abbrev. to TIOA) dissolving in various organic solutions has been studied. The reaction between chromium(VI) and TIOA in o-xylene has been discussed in detail. It has been found that dichromate ion and hydrogen chromate ion coexist in the system, based on the extraction data and the IR and UV-visible spectra of the TIOA-chromium salt. The chromium extraction equilibria can be expressed as: ‾TIOA+H++HCrO4−‾(TIOAH)HCrO4 2‾TIOA+2H++CR2O72‾(TIOAH)2CR2O7 The extraction constants are obtained.
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Huang et al. (1991) studied this question.
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