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本文用分光光度法研究 EDTA—Sb(Ⅱ)螯合物,其吸收峰在210mμ处。在 pH=1.6—2.0之间络合物的克分子消光系数∈最大。pH=2.0,Sb(Ⅲ)在10γ/ml 之内服从比耳定律。(1.210±0.0003)×10~4用 Job 浓比递变法,pH=2.0,在215mμ处测其光密度,求得螫合物的组成为 AB型,并计出在27—28℃K 稳定=(2.10±0.29)×10~(12)。用 pH 滴定法在离子强度μ=0.1,t=25℃下测得 NTA 的连续电离常数K_1=1.10×10~(-2),K_2=1.93×10~(-3)及 K_s=1.98×10~(-10)。从生成函数 n 对 logY~≡作生成函数曲线求得求得 NTA—Sb(Ⅲ)螫含物为 AB 型,(?)定稳:(5.23±1.15)×10~8。
In this paper, the EDTA-Sb (Ⅱ) chelate was studied by spectrophotometry with the absorption peak at 210mμ. The molar extinction coefficient ε of the complex is the largest between pH = 1.6-2.0. pH = 2.0, Sb (III) obeys Beer’s Law within 10γ / ml. (1.210 ± 0.0003) × 10 ~ 4 with Job concentration ratio method, pH = 2.0, at 215mμ its optical density was measured to determine the composition of the AB compound type AB, and counted at 27-28 ℃ K = (2.10 ± 0.29) × 10 ~ (12). The continuous ionization constants K_1 = 1.10 × 10 -2, K_2 = 1.93 × 10 -3 and K_s = 1.98 × 10 NTA measured by pH titration at ionic strength μ = 0.1 and t = 25 ℃. ~ (-10). The content of NTA-Sb (Ⅲ) was determined to be AB by generating function curve n of logY ~ ≡, and the stability of (?): (5.23 ± 1.15) × 10 ~ 8 was obtained.