Published:Journal of Chromatographic Science,
ISSN 0021-9665Volume 37, Number
12, December 1999, pp. 486-494
Determination
of Acrylamide Monomer in Polyacrylamide Degradation Studies by High-Performance
Liquid Chromatography
Leonard
M. Ver VersA
high-performance liquid chromatography method using C18 and ion-exchange columns
in series is developed for the determination of acrylamide and acrylic acid monomers
in polymeric samples. The C18 column acts as a guard column, trapping surfactants
and impurities and retaining the nonionic species. The ion-exchange column then
separates the monomers according to their respective ionic strengths. This method
has been proven in the laboratory to work successfully for all types of acrylamide/acrylic
acid polymers and matrices. Detection limits for both monomers can be achieved
in the parts-per-billion range. The method is used to study the possible degradation
of polyacrylamide to acrylamide monomer in the presence of glyphosate (a herbicide)
and sunlight. Polyacrylamide is used as a spray drift reduction aid in combination
with glyphosate. In normal applications, the polymer and herbicide are in contact
with each other in the presence of sunlight. The results show that the polymer
does not degrade to acrylamide in the presence of glyphosate or sunlight or any
combination of the two. It is also observed that glyphosate influences the solubility
of polyacrylamide, and care must be used when combining the two.
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