...Although there are not many types, a group of reagents called "ultra-high purity reagents" are commercially available under the trade names Spurapur (E. Merck, West Germany) and Ultrex (JT Baker, USA). The amount of trace impurities is far greater than that of JIS special-grade reagents, and they are even more pure than standard reagents. Reagents such as ethyl alcohol, sodium chloride, explosives stability test reagents, and volumetric analysis standard reagents have standards for "official-sealed reagents" that are compulsorily sealed by the state. Reagents with a purity of grade 1 or higher have purity test data that meets the standards clearly stated on the label, including the minimum pure content, the upper limit of impurity content, solubility, ash content, specific gravity, boiling point, melting point, etc. *Some of the terminology used to refer to "official reagents" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…また,まだ種類は多くないが〈超高純度試薬〉と称される一群の試薬がシュプラプールSpurapur(西ドイツのメルクE.Merck社),ウルトレックスUltrex(アメリカのベーカーJ.T.Baker社)などの商品名で市販されているが,痕跡不純物の量においてJIS特級レベルの試薬とは格段の差があり,標準試薬よりもさらに高純度である。試薬エチルアルコール,塩化ナトリウム,火薬類安定度試験用試薬,容量分析用標準試薬などには,国家が強制官封する〈官封試薬〉の規格がある。試薬1級以上の純度の試薬には,ラベルにその規格に合致する純度検定のデータが明記されており,最低純分含量assay minimum,不純物含量の許容上限,溶解性,灰分含量などのほか,比重,沸点,融点などの記載がある。… ※「官封試薬」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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