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| IHS
Mission & Goals: |
Groom
Skills,
Gather Evidence and
Generate Knowledge for people's health.
To Improve the
Efficacy,
Quality & Equity
of Health Systems.
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Water
Quality Testing Services ...
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Ground
Water Bacteriological Contamination Test (GBT) | |
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If borewell is near to sewerage, septic
tank, place of open defecation then
there is a possibility of fecal contamination. Usually
the chemical characteristics of
a source does not change so much. Hence, there is no
need to repeat the chemical
characteristics at short intervals. The test helps to
monitor bacterial contamination due to
seasonal changes, and also to assess the
quality of treatment.
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A. Sample Required:
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At least 100 ml of sample water is
collected in 125 ml (B125) water sample
collection bottle or equivalent, delivered at
laboratory preferably within 6
hrs, but not later than 24 hrs from time of
collection. Keep away from sunlight.
Avoid exposure to excessive heat. Keep in
refrigerator, if delayed delivery
is anticipated.
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B. Test Duration:
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If sample is found satisfactory, then
report will be available after 48 hours.
If sample is found to have bacteria then further test
will be made to look for
indication of fecal contamination, isolate specific
organisms. This test will take
another 48 hours. So report will be available after 96
hours.
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C. Report Details:
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Most probable number of organisms (MPN) present per
100 ml of water.
This is an
indicator of bacterial contamination.
2. Tests to investigate possible
source of bacterial contamination. These tests will be
done only if the MPN
value is found unsatisfactory.
i. Confirmatory test for E.Coli
which indicates fecal contamination.
ii. Isolation of specific bacteria
such as Salmonella, Fecal Streptococci.
3. Interpretation, based on test
results and sample collection record. | |
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