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3.0 Taking a Sample
The first critical step in any analysis is taking a
representative sample. When selecting a sample
point a number of care points are recommended
as follows:
• Ensure the sample point is safe to access
and follow all relevant/required precautions
• When sampling from a tap or outlet, remove
any attachment and clean the tap/outlet with
a dry cloth before allowing to run for 1 minute
prior to sample collection
• When sampling from a pool or spa take the
sample as near as possible to the centre of
the pool and at least 20cm below the surface
of the water
Taking a Sample
• Rinse any sample container repeatedly with
the sample to prevent any cross contamination
from previous samples
• Once collected the sample must be processed
immediately or as quickly as possible, especially
for highly reactive species such as chlorine for
example. The use of a portable field test kit
makes this possible. However if the delay
between sample collection and analysis is likely
to be several hours chill the sample to preserve
and prevent potential sample deterioration
• Samples containing solid particles can interfere
with photometric analysis. Either allow solids
to settle and decant the clear liquid or filter
the sample prior to analysis
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