Abstract
A 19F NMR method for the determination of boron was investigated. A boron-containing sample is treated with hydrofluoric acid, and the solution is adjusted to Ph34 by aqueous NH3 (1 : 1). The content of boron is determined by measuring the peak area of BF4- signal.
The hydrolysis of BF4- to BF3(OH)- is very small, and the BF4- itself is a stable ion. At pH34 the exchange between F- and BF4- which would lead to the broadening of signal line was not perceived.
For the determination of boric oxide in glasses, the proposed method may be rapid and simple compared with the conventional method.
