製紙工場周辺の臭気に関する調査研究(5) : 春日井市内の硫化水素のバックグラウンド

Abstract

The purpose of this paper is to offer an example of how to gain the odor background that should be consulted in controlling odor nuisance. The city is of about 93km^2 extent and, in its south-western portion, has an extensive paper-mill. The investigation was performed as follows-Over the municipal area, an imaginary grid with its unit of 2., 25km×1.85km, was placed, more than one observing station being located in it, and, during 3 years ranging from April 1988 to March 1990,the concentrations of odorants were mesured gaschromatographically, while the intensities of odor were evaluated organoleptically. The results are shown in Tables 1-(a, b), 2-(a, b) and 3-(a, b); their essentials is given in Table 4. It would appear, in consequence of detailed examination of the tables, that the hydrogen sulfide background in recent years be at a concentration level lower than 0.5ppb; The view might be supported by the concentration frequencies as given in Table 5-a and 5-b(1,2) which were constructed from the 3 year data. Mention was made of the fact that authors had, considering the results obtained for the period 1981 to 1988,pointed out the hydrogen sulfide back ground to be 0.4 to 0.2ppb.