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CHAPTER 5 2 – 3 SAMPLE ANALYSIS
The standard laboratory analysis described in Chapter
2 Section 12, is appropriate for most investigative and
operational purposes, but where the degree of precision
necessary to distinguish between high and good status is
not needed, field sorting may be appropriate.
For pollution investigations, field sorting on the bankside
immediately after sampling provides important information
about the numbers of invertebrates in the sample that were
already dead, and may have been killed by the pollution
event (see Chapter 2 Section 11). This can supplement
information provided by standard laboratory analyses,
which must be subject to full quality control and therefore
have known precision.
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