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耐火材料中硼的测定,一般采用酸碱滴定和姜黄素比色法,需经交换分离或蒸馏分离后才能测定。探作较繁琐,不易掌握。近年来,BF_4~-选择电极已成功地应用于水、硅、钢铁、硼硅玻璃和某些矿物中硼的测定,但耐火材料中微量硼的测定尚未见报道。本文采用高压溶样器密闭分解样品,解决了锆刚玉耐火材料样品分解难的问题,避免了硼的氟化物的挥发损失,集样品分解与硼的氟化于一体。然后用氨水调 pH 形成 NH_4HF_2缓冲体系作为 TISAB,用 BF_4~-离子选择电极直接测定。操作简便,易于掌握和推广,方法的精密度和准确度
Determination of boron in refractories, the general use of acid-base titration and curcumin colorimetric method, subject to exchange separation or distillation separation can be measured. Explore more complicated, not easy to grasp. In recent years, BF_4 ~ - selective electrode has been successfully applied to the determination of boron in water, silicon, steel, borosilicate glass and some minerals. However, the determination of trace boron in refractory materials has not been reported yet. In this paper, a high-pressure dissolvent sampler was used to airtightly decompose the sample, which solved the problem of difficult decomposition of zirconia corundum refractory sample, avoided the volatilization loss of boron fluoride, set sample decomposition and boron fluoridation in one. Then adjust the pH with ammonia to form NH_4HF_2 buffer system as TISAB, with BF_4 ~ - ion selective electrode direct determination. Easy to operate, easy to grasp and promote, the precision and accuracy of the method