astm d7781 News

  • Enzymatic Nitrate Determination Now an ASTM Standard Method

    NECi enzymatic method for nitrate determination is now an ASTM International Standard Method.  This method is meant to replace methods D1254 (Nitrite) and D992 (Nitrate).   Method D1254 uses a reagent which is considered to be a possible carcinogen. Method D992 is mentioned by ASTM to "have relatively large errors when used in wastewaters and also has greater manipulative difficulties" ...


    By NECi Superior Enzymes

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