我们已在前文中根据文献[2]所提供的数据,经过计算和反复实验证明Hg(Ⅱ)—XO—HMTA三元络合物显色体系的摩尔吸光系数达不到10~5数量级(在文[2]由ε_(590)=2.2×10~5l·mol~(-1)·cm~(-1)),而应该是10~4数量级(ε_(590)=1.8×10~4l·mol~(-1)·cm~(-1))。本文根据有关理论和通过反复实验证明文[2]中得出的Hg(Ⅱ)—XO显色体系的摩尔吸光系数ε_(590)=1.7×10~5l·mol~(-1)·cm~(-1)是不成立的,在文献[2]所采用的实验条件下Hg(Ⅱ)和XO不能形成稳定的络合物。关于Hg(Ⅱ)—XO显色体系灵敏度问题我们进行了以下研讨。众所周知,二甲酚橙(XO)并非是“超灵敏显色剂”,从XO与四十余种金属离子的显 We have previously demonstrated that the molar extinction coefficient of the Hg (II) -XO-HMTA ternary complex chromogenic system is less than 10-5 on the basis of the data provided in [2] However, it should be on the order of 10 ~ 4 (ε 590 = 1.8 × 10 -4 l · s -1) from ε 5 590 = 2.2 × 10 -5 l · mol -1 cm -1, mol ~ (-1) · cm -1). In this paper, according to the theory and through repeated experiments to prove [2] in the Hg (Ⅱ) -XO color system molar extinction coefficient ε 590 (590) = 1.7 × 10 ~ 5l · mol ~ (-1) (-1) is not valid, Hg (Ⅱ) and XO can not form stable complexes under the experimental conditions used in [2]. About Hg (Ⅱ) -XO color system sensitivity problems we conducted the following discussion. As we all know, xylenol orange (XO) is not “ultra-sensitive developer,” XO and more than forty kinds of metal ions was