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 iron content of boric acid, boric oxide, $7Idi$7Rsodium tetraborates, sodium perborates and crude sodium borates
工业用原硼酸、三氧化二硼、四硼酸二钠、过硼酸钠和粗硼酸钠的试验方法