“…Therefore, as a preliminary study, urines of smoker [18], fire victim and victim poisoned with cyanide, denoted as group 1, was compared with urines of non-smoker, denoted as group 2, to see if the present method is applicable to those samples. Since levels in casual urine of Japanese showed a very large difference due to high iodine intakes [21], the level of each subjects was listed as follows: a smoker, 8.5 × 10 −6 M; 8 fire victims (3,4,10,11,12,15,20,31) × 10 −7 , respectively; a victim poisoned with cyanide, 6.0 × 10 −5 M; 10 non-smokers (4,5,11,12,15,20,46,56,105, 310) × 10 −7 , respectively. The values of group 1 were from 3 × 10 −7 to 6.0 × 10 −5 M and those of group 2 were from 4 × 10 −7 Table 1 Intra-day (six times) and inter-day (6 days) variations of I − values determined by the present method.…”