因钨砂中含有高价锰对亚铁的测定有严重干扰,至令尚未有一个比较可靠的分析方法。为此,本法在带严密保护装置的条件下,用少量氟化铵、碳酸氢钠和盐酸分解试样进行了试验。结果表明,将含亚铁9.10%的铁矿标样制成氧化锰含量为10—14%的钨砂模拟样进行分析,锰无干扰;用含氧化锰14%的钨精 Due to the high price of tungsten in the determination of ferrous metals have a serious interference, so that there is not yet a more reliable analytical methods. To this end, the law with a tight protective device conditions, with a small amount of ammonium fluoride, sodium bicarbonate and hydrochloric acid decomposition of the sample was tested. The results showed that the samples containing 9.10% ferrous iron standard were made into tungsten sand samples with manganese oxide content of 10-14%