作废
BS 5688-4-1979 工业用硼酸、氧化硼、四硼酸二钠、高硼酸钠与粗硼酸钠的试验方法.第4部分:水含过硼酸钠中氧化钠、氧化硼和有效氧含量的测定Methods of test for boric acid, boric oxide, disodium tetraborates, sodium perborates and crude sodium borates for industrial use - Determination of sodium oxide, boric oxide and available oxygen contents of hydrated sodium perborates