硼的测定通常用光度法和容量法,当样液中共存有大量的其他离子时,往往影响这些方法的精度。性能良好的氟硼酸根离子选择电极的出现给硼的测定提供了方便。我们在氟化氢介质中将硼转变成BF_4~-,以氟硼酸根离子选择电极指示,标准加入法测定了水样中的硼。卤水中共存的大量K~+、Na~+、Li~+、Ca~(2+)、Mg~(2+)、Cl~-、SO_4~(2-)和适量Fe~(3+)、Al~(3+)、CO_3~(2-)、NO_3~-、Br~-不干扰测定。加入氯化银粉末或适量的硫酸银溶液可消除I~-的干扰。本法不需离子交换分离,比文献介绍的方法简单快速,精度也好,能用于含硼大于100 ppb Determination of boron is usually used photometry and volumetric method, when the sample liquid coexist with a large number of other ions, often affect the accuracy of these methods. The presence of a well-behaved fluoroborate ion selective electrode provides a convenient measure of boron. We converted boron to BF_4 ~ - in the hydrogen fluoride medium, indicated by the fluoroborate ion selective electrode, and the standard addition method for the determination of boron in the water sample. A large amount of K +, Na ~ +, Li ~ +, Ca ~ (2 +), Mg ~ (2 +), Cl ~ -, SO_4 ~ (2-) and proper amount of Fe ~ Al ~ (3 +), CO_3 ~ (2 -), NO_3 ~ -, Br ~ - do not interfere with the determination. Adding silver chloride powder or an appropriate amount of silver sulfate solution can eliminate I ~ - interference. This method does not require ion exchange separation, the method described in the literature is simple and fast, the accuracy is good, can be used for boron containing more than 100 ppb