Abstract
Banned irradiation of liquid acids in many nuclear reactors requires a transformation of these compounds into a solid substance to be able to perform the determination of impurities using instrumental neutron activation analysis. For this purpose, a novel, simple, and contamination-free procedure for the transformation of phosphoric acid into ammonium phosphate has been developed, which is based on isothermal distillation of ammonia vapours. Favourably low detection limits for more than 35 elements have been achieved and the accuracy of the results has been established by analysis of NIST SRM 1515 Apple Leaves.
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