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A method was sought by which a gas sample could be analyzed d i r e c t l y f o r t r a c e q u a n t i t i e s o f ammonia w i t h o u t t h e need f o r cryogenic f r a c t i o n a t i o n o r o t h e r means o f ammonia concentration. Such a method has been developed. Gas chromatography o f an as-received sample using a Porapak N column and an u l t r a s o n i c d e t e c t o r i s capable o f d e t e c t i n g ammonia down t o 150 ppm