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TAPPI T 600 om-15 Analysis of Formaldehyde in Aqueous Solutions of Free Formaldehyde in Resins
standard by Technical Association of the Pulp and Paper Industry, 2015
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TAPPI T 600 om-15 is for the analysis of the formaldehyde content of aqueous solutions of the gas.With the precautions given, it can also be used to determine the free (unreacted) formaldehyde content of resins used in paper treatment. Experience has indicated the method is adaptable to determination of free or unreacted formaldehyde in urea formaldehyde resins.
Most aldehydes and certain ketones will undergo the same reaction as formaldehyde. Thus the presence of other aldehydes will give erroneous results.
Acids and alkalis interfere in the titration, but this can be overcome by neutralization prior to reaction.
There are known instances where the formaldehyde is bound so loosely that it is very difficult not tohydrolyze the resin. Conducting the reaction at 0-5C minimizes the hydrolysis.