The particulate material in the samples was allowed to settle. The liquid and very
fine-grained suspended sediment was removed and stored and the settled fibres
and particulate material were dried in an oven at 60C. The dried material was then
weighed and examined by low-powered light microscopy, compound light
microscopy and scanning electron microscopy (SEM) to determine the nature of any
characteristic features. Subsamples and characteristic features were photographed.
A subsample from sample B was analysed by X-ray microanalysis in order to
determine its elemental composition and a larva from sample B was submitted to a
consultant entomologist for identification and comment.
RESULTS AND DISCUSSION
The dried fibres and particulate matter from the three samples was weighed. The
results are shown in Table 1 below below:
Sample weight of dried
Table 1 dried sample