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Determination of free melamine content in uncured non-ionic and sulfonated melamine-based resins by reversed-phase
1National Institute of Chemistry, Department of Polymer Chemistry and Technology, Hajdrihova 19, Ljubljana SI-1000, Slovenia.
Abstract:
Melamine-formaldehyde resins are used in various industrial applications. As melamine is a toxic compound on the candidate list of Substances of Very High Concern, its content in melamine-based resins is important. Here we present two high-performance liquid chromatography methods suitable for the determination of free melamine content in uncured non-ionic and negatively charged melamine-based resins. A gradient reversed-phase liquid chromatography method using a C18 column was developed for the determination of free melamine content in non-ionic resins, while an isocratic mixed-mode liquid chromatography method using a Primesep 100 column was developed for the quantification of free melamine in sulfonated melamine-based resins. Both methods utilise ultraviolet detection, which allows the quantification of melamine in melamine-based resins with a limit of quantification of ∼10-3% by weight and good repeatability and linearity over a wide range of melamine concentrations.
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