将有机质样品燃烧检测氟离子应用于铜精矿中氟测定,建立了氧瓶燃烧-离子色谱法测定铜精矿中氟的方法.由于铜精矿原样难于燃烧,通过掺杂纤维素助燃(纤维素与铜精矿最佳质量比为7∶1),压片制备铜精矿试样,经改进的氧瓶燃烧后被水吸收,吸收液经0.22 μm水系微孔膜,进入离子色谱仪测定氟离子.结果表明,线性范围内(0.100～2.000 mg/L)校准曲线相关系数r＞0.999,氟的检出限为2.31 μg/L;按照实验方法测定铜精矿样品中氟,结果的相对标准偏差(RSD,n=5)为1.8％～4.5％,回收率为92％～97％.将实验方法用于铜精矿标准样品氟含量测定,测定值与认定值吻合性较好;方法对照试验表明,实验方法对氟含量的测定值与国家标准GB/T 3884.5-2012的测定值基本一致.
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