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The distribution data were numerically analyzed for the extraction of trace lead(II) from 1·0 mol dm−3 (Li,H)NO3 media with toluene solutions of acidic organophosphorus compounds (HR), including di(2‐ethylhexyl)phosphoric acid (D2EHPA) and 2‐ethylhexylphosphonic acid mono‐2‐ethylhexyl ester (HEHEHP). The complex formulations were determined to be {article}{empty}{document}PbR₂ (HR), PbR₂ (HR)₄ , and Pb(NO₃ )R{document} for the D2EHPA system and to be {article}{empty}{document}PbR₂ (HR)₃ , PbR₂ (HR)₄ , and Pb(NO₃ )R(HR){document} for the HEHEHP system. In this work, the equilibrium constants for the formation of these complexes were also given at 298 K.
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Juang et al. (1994) studied this question.
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