In the Kakehashi River basin in Ishikawa Prefecture,
several areas were highly polluted by Cd originating
from an upstream mine, and adverse health eects were
observed in inhabitants of these areas (Department of
Health, Ishikawa Prefecture 1976). e rice Cd concen-
tration in the target area was 0.67ppm, which indicates
the most marked degree of pollution in areas in the
Kakehashi River basin (Department of Health, Ishikawa
Prefecture 1976).