Sampling techniques
provides a selection of techniques to take solid or liquid 
samples for measurements.
Sampling technique involves a procedure consisting of 
a sampling plan, well purging, sampling, preservation,
transport and storage of samples. Sampling may be used to
investigate and monitor contamination or to study natural
water quality.

The main purpose of good sampling technique is to ensure
that the collected sample is representative of the water
under investigation.

Use of inappropriate sampling technique may cause inaccuracies
that greatly overshadow the normal uncertainties of chemical
analysis. The existence of these inaccuracies may go unnoticed
or the cause of identified inaccuracies may be difficult
to expose. This may be due to the concentration inhomogeneities
that typically exist in the field.

Sampling technique depends on many factors, including
the sampling location, the parameter to be analyzed and
the equipment available for sampling.
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