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本文介绍了一种快速、简便,适用于检测污染水中微量F~-的新方法。在1~2N醋酸介质中,F~-与不溶性固体试剂锆-锥虫蓝络合物反应,释出溶于水的锥虫蓝染料(λ_(max)=590nm)。该试剂可存放数月。水中Na~+、K~+、NO_3~-和NO_2~-无影响;Ca~(2+)、Mg~(2+)、Fe~(3+)和Al~(3+)干扰,可用阳离子交换树脂除去;>4ppm PO_4~(3-)和SO_4~(2-)也干扰(与锆化合);OH~-
This paper presents a new method that is quick, simple and suitable for the detection of trace F ~ - in contaminated water. In 1 ~ 2N acetic acid medium, F ~ - reacts with zirconium-trypan blue complex, an insoluble solid reagent, to release trypan blue dye (λ max = 590 nm) dissolved in water. This reagent can be stored for months. There is no interference of Na ~ +, K ~ +, NO_3 ~ - and NO_2 ~ in water, Ca ~ (2 +), Mg ~ (2+), Fe ~ (3+) and Al ~ Exchange resin removal;> 4ppm PO_4 ~ (3-) and SO_4 ~ (2-) also interfere (with zirconium); OH ~ -