Microwave acid digestion method adhesives

To monitor these concentrations of stabilisers for precise, accurate measurements a method must be available that must detect levels as low as 600 ngg-1 and as high as 5000 ngg-1. The allowed tolerance can vary between 20% for low levels to 10% for higher levels without affecting the performance of the product. The lower concentration would be expected to cure faster than those containing higher concentrations of stabiliser. The different level of stabiliser is dictated by the application of these adhesives and must be formulated under very controlled conditions. ICP-OES is an ideal tool to monitor the metal type stabilisers using sample dilution, bomb combustion or microwave acid digestion methods. 

Table 6.27 Results of analysis of polyurethane (PU) adhesives spiked with 0.1 % organometallic catalysts using destructive methods ashing, microwave acid digestion and bomb combustion methods of sample preparation...

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