5－氯－甲亚胺H与硼显色反应的研究及应用

Study on the spectrophotometric determination of boron with 1-(2-hydroxy-5-chlorobenzylidene-amino)-8-hydroxynaphthalene-3, 6-disulphonic acid and its application

合成了新显色剂５－氯－甲亚胺Ｈ，并研究了其与硼的反应条件。在ｐＨ５．５的乙酸－乙酸铵缓冲溶液中，显色剂与硼形成２：１的络合物。最大吸收波长为４３０ｎｍ。摩尔吸光系数为５．９５×１０~３Ｌ·ｍｏｌ^（－１）·ｃｍ^（－１）。Ｓａｎｄｅｌｌ灵敏度为０．００１８μｇ·ｃｍ^（－２）。硼量在０～２５μｇ／２５ｍＬ范围内符合比耳定律。用ＥＤＴＡ掩蔽各种干扰离子可直接测定氧化镁样品中的硼。方法快速、准确。

In this paper, the synthesis of 1-(2-hydroxy-5chlorobenzylidene-amino) -8-hydroxynaphthalene-3,6 disulphonic acid is reported and its reaction with Bhas been studied. In an NH4Ac-HAc buffer mediumof pH 5.5, B reacts with the reagent to form a 1:2yellow complex having a maximum absorption at 430nm. Its molar absorptivity being 5.95 ×103L·mol-1 ·cm-1, Sandell's sensitivity being 0. 0018μg·cm-2, Beer's law is obeyed for 0-25μg B in 25mL.This method has been applied to the determination of B in magnesium oxide with good results.