Abstract
The variability of threshold odor number (TON) using olfactory sensory test by triangle flask method was analyzed, for the purpose to discussed the effect of water temperature.
The water quality and TON of main rivers in Tokyo were measured at same time. The following results were obtained.
1) The average of TON of river water were measured at various temperatures 13°C, 25°C, and 40°C. The sensitivity of TON (40°C) increased 1.5 times to compared with TON (25°C). But the within-individual variability of TON (40°C) increase d 1.5 times to compared with TON (25°C).
2) TON (25°C)[Y] of 34 river watres in Tokyo Metropolitan were 2-130, and BOD [X] were 1>-23 ppm.Relati onship between Y and X wasy=4.6X+0.8
a coefficient of correlation was 0.71.
3) From the questionnaire investigation of odor around riv, r, guideline of TON (25°C) is considered to reduce about 50 at the place of the width of river under 10 m, to keep minimum the influence for extent of odor from river.
