To cultivate microorganisms in glass, water samples should be collected from ponds, lakes and rivers. You can put hay in a beaker, take pond water and pour it in, and soon you can see the rapid propagation of microorganisms.

relevant information

1. The collection of water samples for microbial inspection must be carried out in accordance with aseptic operation technology, and it must be guaranteed not to be polluted by the outside world during the inspection. Only in this way can we reflect the real situation of microorganisms in local water bodies.

2. The collected samples should be representative, and the items that are easily affected by environmental changes should be tested on the spot. The samples to be tested in the experiment should be properly preserved and fixed before testing to ensure that the samples will not change significantly before analysis. Standardized circulation procedures to ensure that samples are not confused or omitted.

3. Different sampling points will lead to different physical and biological environmental conditions of water, among which the species, quantity and activity of living microorganisms are quite different. In order to obtain representative water samples, the selection of sampling points is very important. Water layer with water depth of 20 ~ 30cm should be selected for sampling in flowing rivers. If the vertical distribution is investigated, the deepest part of the river should be selected as the collection point.

4, lake water sampling should be carried out in the lake center and coastal representative areas. When judging the impact of sewage on rivers and lakes, samples should be taken at a certain distance from sewage outlets and representative sewage outlets, and samples should be taken in the upstream waters without pollution as a control. The selection of sampling points in the ocean and harbor should also be based on the specific environment, which is generally dense near the shore and far and sparse offshore.

5. At the same time, different investigation purposes should be considered, such as basic investigation, investigation, special investigation and emergency investigation.

6. Before collecting water samples, the sampling bottles, water collecting balls, pipettes, water outlet pipes, water storage bottles, filters, Petri dishes and other instruments shall be disinfected according to the number of investigation stations and sampling quantity specified in the investigation plan. All sterilization instruments can only be used once. To complete the required quantity.