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在含有0.04MEDTA和0.06MKBrO_3的醋酸-醋酸钠底液中,钛与EDTA的络合物产生一个很灵敏的极谱催化波。底液的最佳pH范围为3.5—5.0。峰电位为-0.40伏(相对于S.C.E):TiO_2浓度在0.5—5.0微克/25毫升范围内,峰高与浓度间呈良好的线性关系。以此为出发点,试验选择了最佳底液组成,在进行干扰试验的基础上,拟定了地质试样中微量钛的测定方法。
The complex of titanium and EDTA produced a very sensitive polarographic catalytic wave in the acetic acid-sodium acetate bottoms containing 0.04 M EDTA and 0.06 M KBrO 3. The best pH range of the bottom liquid is 3.5-5.0. The peak potential was -0.40 V (vs. S.C.E): TiO 2 concentration was in the range of 0.5-5.0 μg / 25 ml and peak height was linear with concentration. Taking this as the starting point, the optimum bottom liquid composition was chosen for the experiment. On the basis of the interference test, a method for the determination of trace titanium in geological samples was developed.