DETERMINATION OF BORON IN NICKEL-BORON ALLOYS

Two procedures have been developed for determining boron in nickel-bor on alloys. The first method is based on the use of the chromatographic HPLC technique with conductivity detection and the second one uses th e fluoborate-selective electrode. The treatment of the sample is the s ame in both methods: the alloys are easily dissolved with HF and H2O2 and the boron is transformed into fluoboric acid. Common alloys. conta ining 1-8% boron, can be analyzed by potentiometry with a precision of about 0.4-0.8%. The chromatographic method (HPLC) offers a decidedly higher sensitivity than the potentiometric method but its precision is poorer (3-5%).