水浴溶样-硝酸铵氧化法测定氧化锰矿中锰含量

Determination of manganese in manganese oxide ores by water bath decomposition-ammonium nitrate pre-oxidation

采用XRD和XRF分析了氧化锰矿样的物相组成和含量。对锰矿石标准物质和实际氧化锰矿样采用浓HCl和HF在90℃下水浴溶解60 min,硝酸铵氧化进行测定,样品溶解完全,温度与时间易控制,相对标准偏差小于0.16%,标准物质测定值与标准值吻合。

The phase compositions and contents of the manganese oxide ores were identified by X-ray diffraction （XRD） and X-ray fluorescence （XRF） methods. Standard manganese ores and practical samples were completely dissolved by concentrated hydrochloric and hydrofluoric acid in a water bath of 90 ℃ for 60 min, followed by ammonium nitrate pre-oxidation for determination. The temperature and time can easily be controlled. The relative standard deviation was less than 0. 16%. The determined value of the standard sample corresponded to the standard value.