RESUMO
We investigated the content of NO<SUB>3</SUB>-N in the well water of the eastern, middle and nothern districts of Nagano Prefecture. The NO<SUB>3</SUB>-N content seasonally changes and takes on the pattern of a high in summer and a low in winter.<BR>Rain is considered to dilute the contaminated well water, but it lets NO<SUB>3</SUB>-N flow from the soil into the.well water, when the rain is poured by a typhoon. As a result, a high content of NO<SUB>3</SUB>-N is measured in the well water.<BR>The water sample of 25 out of 85 wells in Matsukawa Town exceeded the tolerance level of NO<SUB>3</SUB>-N (10 ppm, but 44.3 ppm in terms of NO<SUB>3</SUB><SUP>-</SUP>).<BR>By crop area, the amount of NO<SUB>3</SUB>-N was highest in the fruitgrowing area, which was followed in order of the vegetable-growing area, the flower-growing and the rice planting area.<BR>We consider that the contamination of well water is caused both by chemical fertilizers and the less absorbility of the soil.
RESUMO
Two hundred and thirty adipose tissues were collected from inpatients, who had undergone an operation and an autopsy in the Saku Central Hospital from 1980 to 1982. Organochlorine pesticides were extracted from the adipose tissues and determined by gas-liquid chromatography with an electron-capture detector.<BR>The mean value was 1, 429 ppm for total BHC among males, and 1.665 ppm among females, 4.893 ppm and 3.791 ppm for total DDT, 1.082 ppm and 0.782 ppm for PCB, respectively. Regression analysis between the total BHC residue and the ages of patients indicated a positive correlation for both sexs. As for the relation between the rate of obesity and the residues, low rates of obesity (-10%--19%) were most significantly correlated with high values of total BHC, total DDT and PCB.<BR>We also discussed relations between cancerous diseases and the residues.