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The Government Chemist carried out several referee analyses for nitrofuran veterinary residues in shellfish and other crustaceans which led to recommendations for analysis and reporting.
The recommendations include:
testing the inner core of animal meat in crustaceans, as semicarbazide (a nitrofuran metabolite) may occur naturally in the shell of crab, langoustines and shrimps
for products in ice, the sample is thawed and the water drained away
subtracting the measurement uncertainty from the mean result to yield a ‘not less than figure’ used for reporting ‘beyond reasonable doubt’