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10.3. Taking samples of bottom sediments
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10.3. Taking samples of bottom sediments
The samples of bottom sediments were taken by a tube device for taking samples with a cross section of 54 см 2 according to ISO 5667-12-1995, "Water Quality. Manual on Taking Samples of Bottom Sediments". Before taking samples, we opened the device by rotating a rod and raising a flange to the upper position. Then we laid it on the bottom and pushed into the ground, afterwards by rotating the rod (in opposite direction) and lowering the flange, we closed the device tightly. After the device was taken out of water, the sample was removed by raising the flange - lack of tightness could end in falling out of sample. We took a mean sample and its duplicate from several devices, the height of sample column was ~10 cm. Samples were placed into plastic bags and marked. Every sample or its duplicate was accompanied by records on taking sample written just at the place, where they were taken (Appendix 3). Afterwards, samples were delivered to the central laboratory (in Minsk) for tests on metals, phenols and pesticides.
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10.2. Taking of water samples for hydro-chemical tests