Occurrence of Volatile N·nitrosamines in Japanese Salmon Roe

recoveries of 49 mg (23%), 56 mg (25%), 18 mg (10%), and 6 mg (50%), respectively. Thus, the official method of filtration resulted in an average loss of oil and grease of 25% of the values determined by the proposed method. Two effluents (3 and 4) were precipitated by the method in this paper but extracted by the Soxhlet method and gave 16 and 5% low values, respectively. In addition, contamination of the oil fraction with Celite and fiber is apparent in the EPA Soxhlet method and oil and grease values are estimated to be 5-10 mg lower than reported.