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稀土金属及其氧化物中非稀土杂质 化学分析方法 第21部分:稀土氧化物中硫酸根 含量的测定 硫酸钡比浊法 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides— Part 21:Determination of sulfate radical content in rare earth oxides—Barium sulfate turbidimetry ICS 77.120.99 CCS H 14 中华人民共和国国家标准 GB/T 12690.21—2024 2024-10-2 6发布 2025-05-0 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 分析试液的制备 ················································································· 2 8.5 测定 ······························································································ 3 8.6 标准曲线的绘制与测定 ·········································································· 3 9 试验数据处理 ························································································· 4 10 精密度 ······························································································· 4 10.1 精密度原始数据及统计 ········································································· 4 10.2 重复性 ·························································································· 4 10.3 再现性 ·························································································· 5 GB/T 12690.21—2024 Ⅰ
GB-T 12690.21-2024 稀土金属及其氧化物中非稀土杂质化学分析方法 第21部分 稀土氧化物中硫酸根含量的测定 硫酸钡比浊法
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