Abstract
It is widely known that waler supplying pipes were formerly made of lead and now vinylchloride polymer pipes are used In both cases, a small amount of lead is dissolved in drinking waler. During the night, we don't use much water, so the amount of lead dissolved in the drinking water is considered to be high in the morning.
Especially in buildings, tanks are used for supplying waler. Therefore, the influence of lead and v inv Icholride pipes and tanks must be considered.
In my experiment, prepared specimens of different quantities were made and influence of lubes and tanks was examined by Bi-Digital O-Ring Method.
(Experiments):
100ml of water was collected from Building 1, 2, 3 and 4 in the early morning as well as in the afternoon around 5pm
Amounts of Hg were determined by Bi-Digital O-Ring Test using the prepared specimens.
It was proved by this method that 100ml of drinking water contained from 330 to 345 pg of Hg in the early morning and the same amount of water contained from 45 to 60 amounts of Hg around 5p.m.
Contents of Pb are known to be large in quantity in the early morning However, in my university where all buildings use tanks, it was proved that Hg was invariably dissolved in the drinking water
From the fact, it is recommended not to drink the water collected in the early morning and to keep water stored in some containers before leaving the office
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