Field samples, for water, corrosion products and bacteria, should be sampled by trained staff in situ. To preserve the microbial sample, the growth medium to sustain the microbial growth is required. Collecting microbiological samples into clean containers is often useless.
Soil and water should be placed in sterile containers and kept in esky. If the microbial analysis is required, the samples should be stored in the following method:
1) With a fixing agent such as cacodylate buffered 4% gluteraldehyde.
2) In a culture medium in which microorganism can cultured and grown,
3) In a special prepared field testing kit for immediate field testing.