Abstract
The amounts of heavy metals discharged from various domestic sources (tap water, gray waters and feces etc.) were quantified at Yokosuka, Hachinohe and Hakodate cities using 4 or 5 monitors at each city.
The values of the heavy metals were Cd 72-192, Ni 405-1, 661, Cr 230-775μg·day-1·person-1 and Pb 0.51-6.75, Mn 6.5-8.2, Cu 3.1-55.8, Zn 21.5-44.3, Fe 24.3-111.1 mg·day-1·person-1.
The amounts of heavy metals derived from domestic sources were also determined from the budget of them in the sewage treatment plants which accepts only domestic sewage. They were Cd 54-252, Ni 450-1, 876, Cr 396-1, 430μg·day-1·person-1 and Pb 0.71-5.04, Mn 7.8-22.0, Cu 2.8-17.9, Zn 19.0-62.7, Fe 96-459mg·day-1·person-1.
