草酸盐重量法测定有机溶液中稀土氧化物总量

采用草酸盐重量法对有机溶液中稀土氧化物总量进行测定,首先用电炉蒸干、高温灼烧的方式对试样进行前处理以破坏有机物,再经碱熔分解、氢氟酸、氨水、草酸进行沉淀分离干扰元素,最后以烧成物形式得到稀土氧化物总量.结果表明,该方法可以测定稀土氧化物总量为1%以下的有机溶液,相对标准偏差为0.96%~2.45%,样品加标回收率为95.00%~98.24%,方法的准确度和精密度均能满足检测的要求.

Determination of total rare earth oxide contents in organic solution with oxalate gravimetric method

Determination of total rare earth oxides in organic solution was achieved by the oxalate gravimetric method.Firstly the sample was dried in the electric furnace and then burn at a high temperature in order to destroy organic matter.Secondly, it was melt by the alkali and precipitated by the hydrofluoric acid,ammonia and oxalic acid in order to separate from the interference elements.Lastly, the sediments were burn to a constant weight,producing of total rare earth oxides.The results show that this proposed method can be used to determine of less than 1% of the total rare earth oxides in organic solution,with RSD of 0.96%-2.45% and 95.00%-98.24% recovery.The accuracy and precision of the method are able to satisfy with the detection requirements.