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Sampling Procedures
Sampling for Chemical examination
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Water for chemical examination should be collected in a clean, white
2 liter polythene container.
- The
source from which water is collected should be in regular use. Otherwise
the source should be adequately flushed before sampling. For hand pump
sources, the water should be pumped and wasted for at least three to
five minutes to clear all dirt, slime and turbidity. Water from wells
should be taken in the middle at mid depth. For lakes, rivers and dams,
the water should be collected near the off-take point.
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Before collection of sample, the container should be washed with the
water to be sampled for at least 2 to 3 times.
- The
water should be then filled completely in the container without leaving
any air space.
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Place the inner cap. Place a polythene sheet (10x10 cm) in between the
inner and outer caps. Screw the outer cap. Place another polythene sheet
of same size over the outer cap and tie the neck with a rubber band
or twine thread.
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Label the container with all required source particulars.
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The sample should be delivered to the lab within 24 hours from the time
of collection.
Sampling
for Bacteriological examination
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For bacteriological examination, the water should be collected only
in a presterilized 250 mL glass bottle which is supplied from the laboratory
after remitting the testing charges.
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The sample collection procedures will be explained in the laboratory
when the sampling bottles are delivered to the customer.
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The sample should reach the laboratory within 6 hours from the time
of collection. However when preserved in an icebox, the sample can be
delivered within 24 hours.
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The sample should be labeled properly before it is despatched.
For
further technical details contact:
Chief Water Analyst,
TWAD Board,
No. 31, Kamarajar salai, Chepauk,
Chennai - 600 005
Ph: 28412098
E.mail: twadboard@vsnl.in
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