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本文着重探讨了平平加存在下,铁(Ⅲ)与硫氰酸盐的显色反应。实验证明:平平加与碱金属离子络合生成大阳离子,並进而以抗衡离子与Fe(Ⅲ)-SCN络阴离子作用生成离子缔合物。这是平平加能增敏的主要原因。本实验测得离子缔合物的组成为(sfK~+)·[Fe(NCS)_4~-],其极大吸收在485nm,摩尔吸光系数为2.37×10~4。本文也介绍了显色反应的适宜条件,监应用于测定天然水和石灰石中痕量铁(Ⅲ)。
This paper focuses on the color reaction of iron (Ⅲ) with thiocyanate under the presence of equimolar concentration. Experiments show that: Ping Ping plus alkali metal ions complexation of large cations, and then the counter ions and Fe (Ⅲ) -SCN complex anion ion association complex. This is the main reason for flattening and sensitizing. The composition of the ion-association complex measured in this experiment is (sfK ~ +) [Fe (NCS) 4 ~ -], its maximum absorption is at 485nm and the molar absorption coefficient is 2.37 × 10 ~ 4. This paper also introduced the appropriate conditions for the chromogenic reaction and was used for the determination of trace iron (Ⅲ) in natural water and limestone.