Behavior of Atmospheric Mercury Concentration at Mt. Ohdaigahara, a Clean Area

MATSUMOTO Mitsuhiro, UEDA Naotaka, NISHIKAWA Yoshitaka, ITANO Tatsumitsu

doi:10.11298/taiki1978.21.253

Using a continuous mercury monitor Mercury AM-1 model of Nippon Instruments Co. Ltd. which consisted of the collection by gold amalgamization and analysis by cold flameless atomic absorption spectroscopy, a atmospheric mercury concentration at Mt. Ohdaigahara, a clear area was measured and its behavior was investigated. The atmospheric mercury concentration at Mt. Ohdaigahara ranged from 0.91 to 4.38 ng/m³, and the mean value and standard deviation was 1.58±0.54 ng/m³ (n=435). The behavior of the atmospheric -mercury was similar to that of SO₂, NO₂, NO and CO and moreover, the correlation between concentrations of the atmospheric mercury and other species showed high correlation coefficients (r=0.599-0.673; SO₂: n=234, NO₂, NO_x, CO: n=235). Therefore, it became apparent that even at Mt. Ohdaigahara the atnospheric mercury showed similar behavior of the air pollutants generated from combustion sources. Accordingly, the atmospheric mercury concentration was able to regard of very sensitive index of air pollution. On the other hand, as to meteorological conditions, the atmospheric mercury was not correlated with temperature and humidity but it was correlated with wind velocity. From correlation with wind direction, the correlation coefficient was maximum when the wind direction was ESE direction and the transport of the atmospheric mercury from Owase city was considered. The hourly variation of the atmospheric mercury concentration at Mt. Ohdaigahara showed high in night and low in day. Such a behavior was estimated to affect of geographical factors that was the transport of air from Owase city.

Behavior of Atmospheric Mercury Concentration at Mt. Ohdaigahara, a Clean Area

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