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本文用两相滴定法测得了HDEHP-H_2O-C_6H_5CH_3体系二聚常数l_gK_2=4.23(平均值)、两相电离常数pK_aE=5.70,pK_(2aE)=15.6,并对HDEHP-NaNO_3-C_6H_5CH_3体系萃取Na~+的机理作了探讨,实验表明当中和度a<10％时,我们改变三种起始Na~+浓度(0.20N、1.00N、4.00N)及三种起始HDEHP浓度(1.00×10~(-2)M、1.00×10~(-1)M、1.00M),有机相生成的萃合物形式为(NaA·3HA)_0,其萃合常数的平均值l_gβ_(13)=3.71。
In this paper, the dimeric constants of HDEHP-H_2O-C_6H_5CH_3 system were determined by the two-phase titration method, and the ionization constants pK_aE = 5.70 and pK_ (2aE) = 15.6 for HDEHP-NaNO_3-C_6H_5CH_3 system were obtained. ~ +. The experimental results show that when the degree of neutralization is a <10%, we change the concentration of three initial Na ~ + (0.20N, 1.00N, 4.00N) and three initial HDEHP (1.00 × 10 (-1) M, 1.00 × 10 ~ (-1) M, 1.00M), and the organic phase was in the form of (NaA · 3HA) _0. The average value of the extraction constants was 1_gβ_ (13) = 3.71 .