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化學試劑
發布時間: 2016年07月09日 【字體:

  化學試劑質量級別繁雜、品種眾多,特別混亂。一般常規品種(一類試劑)即必需品種,有225種,在我國的北京、天津、上海、西安、成都、廣州、沈陽化學試劑基地基本上互補生產。二類試劑幾乎應用于一切領域,也是廠商必備的品種,大約有1800~2000個品種,此類試劑需求量大、應用廣泛。三類試劑大約有3000~6000個品種,它們的使用領域大多數關系到國計民生的諸如化工、冶金、電力、食品、醫藥衛生等行業中特定使用的行業試劑。

  在我國,采用優級純、分析純、化學純三個級別表示的化學試劑,按照中華人民共和國國家標準和原化工部部頒標準,共計225種。這225種化學試劑以標準的形式,規定了我國的化學試劑含量的基礎。其它化學品的含量測定都是以此為基準,通過測定來確定其含量。因此,這些化學試劑的質量就顯得十分重要。同時,這225種化學試劑由于用途極為廣泛而成為基本品種。這225個品種在化學試劑目錄中均已標注。 此外,還有特種試劑,生產量極小,幾乎是按需定產,其數量一般為用戶所指定。

  常見質量級別

  優級純(GR,綠標簽):主成分含量很高、純度很高,適用于精確分析和研究工作,有的可作為基準物質。

  分析純(AR,紅標簽):主成分含量很高、純度較高,干擾雜質很低,適用于工業分析及化學實驗。相當于國外的ACS級(美國化學協會標準)

  化學純(CP,藍標簽):主成分含量高、純度較高,存在干擾雜質,適用于化學實驗和合成制備。

  實驗純(LR,黃標簽):主成分含量高,純度較差,雜質含量不做選擇,只適用于一般化學實驗和合成制備。

  指示劑和染色劑(ID或SR,紫標簽):要求有特有的靈敏度。

  指定級(ZD):按照用戶要求的質量控制指標,為特定用戶訂做的化學試劑。

  電子純(MOS):適用于電子產品生產中,電性雜質含量極低。

  當量試劑(3N、4N、5N):主成分含量分別為99.9%、99.99%、99.999%以上。

  光譜純:主要成分純度為99.99%


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