Methods of test for orthoboric acid (boric acid), diboron trioxide (boric oxide), disodium tetraborates, sodium perborates and crude sodium borates for industrial use. Determination of sulphur compounds in boric acid, boric oxide, $7Idi$7Rsodium tetraborates and crude sodium borates Part 5, (28th February 1979) - British Standards Institution,
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