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采用不同浓度的金属和萃取剂,从氯化溶液中将铅萃取到含有过量D2EHPA-煤油溶液中去。萃取容易进行,但其结果表明,对于二价金属离子来说,每萃取一个原子铅是置换1.6个氢离子,而不是同预料那样为2个氢离子。在研究的范围(0.1—1.0克/升)内,萃取不受水相中金属浓度的影响,并且结果极其稳定。独特的logD对pH的关系式,可以让简单的数据集通过相似萃取方程式的运算和利用经验推导的恒定式,估算出萃取的接触级数。所得S型萃取等温线容易判明D2EHPA萃取时水相中铅浓度可能降低的极限值。
Different concentrations of metals and extractants were used to extract the lead from the chlorinated solution to an excess of D2EHPA-kerosene solution. Extraction is easy, but the results show that for a divalent metal ion, each extraction of one atom of lead replaces 1.6 hydrogen ions rather than 2 hydrogen ions as expected. Within the scope of the study (0.1-1.0 g / L), the extraction was not affected by the metal concentration in the aqueous phase and the results were extremely stable. The unique logD-to-pH relationship allows simple data sets to estimate the number of contact steps for extraction through the use of similar extraction equations and empirically derived constants. The resulting S-type extraction isotherm can easily determine the limit value of possible decrease of the concentration of lead in the aqueous phase when D2EHPA is extracted.