钨精矿化学分析方法 第19部分:氟含量的测定 离子选择电极法 Methods for chemical analysis of tungsten concentrates一 Part 19:Determination of fluoride content一 Ion selective electrode method  ICS  77.120.99 CCS  H 14   中华人民共和国国家标准 GB/T 6150.19—2025 2025-01-2 4发布 2025-08-0 1实施     国家市场监督管理总局 国家标准化管理委员会 发 布 目　　次 前言   ·····································································································   Ⅲ 引言   ·····································································································   Ⅳ 1     范围   ··································································································   1 2     规范性引用文件   ······················································································   1 3     术语和定义   ···························································································   1 4     原理   ··································································································   1 5     试剂或材料   ···························································································   1 6     仪器设备   ······························································································   2 7     样品   ··································································································   2 8     试验步骤   ······························································································   2      8.1     试料   ······························································································   2      8.2     平行试验   ·························································································   2      8.3     空白试验   ·························································································   2      8.4     测定   ······························································································   2      8.5     工作曲线的绘制   ·················································································   3 9     试验数据处理   ·························································································   3 10     精密度   ·······························································································   3      10.1     重复性   ··························································································   3      10.2     再现性   ··························································································   4 11     试验报告   ····························································································   4 附录A （资料性）    精密度试验原始数据   ······························································   5 GB/T 6150.19—2025     Ⅰ