作废
BS 5688-7-1979 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7部分:硼酸、氧化硼和四硼酸二钠中铜含量的测定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 copper content of boric acid, boric oxide and disodium tetraborates