Quantitative determination of amino groups on derivatized controlled pore glass: A comparison of methods

✍ Scribed by C.C.Y. Lee; G.Marc Loudon

• Publisher: Elsevier Science
• Year: 1979
• Tongue: English
• Weight: 400 KB
• Volume: 94
• Category: Article
• ISSN: 0003-2697
• DOI: 10.1016/0003-2697(79)90790-5

✦ Synopsis

The following methods of determining covalently bound ammo groups were tested for self-consistency and convenience on aliquots of the same sample of controlled pore glass which has been derivatized with triethoxyaminopropylsilane (aminopropyl glass): (i) the determination of bound picrate; (ii) the determination of 2-hydroxy-l-naphthaldehyde after Schiff base formation on the aminopropyl glass; (iii) direct nonaqueous titration of the bound amines with HCIO, in acetic acid and with CF,SO,H in acetic acid; and (iv) titration by Hg(NO& solution of chloride bound by treatment of the aminopropyl glass with HCl. All methods gave the same results within the precision of measurement. Methods (i) and (iv) appear to be the most convenient.