Collection of Samples - Guidelines:

While collecting water samples for laboratory examination, following points should be kept in mind.

(a) The sample should be handled in such a way that it does not deteriorate or is contaminated before it reaches laboratory.

(b) Before filling the sample, bottle should be rinsed two or three times with water being collected.

(c) Samples should be labeled giving the information regarding name of the collector, the date, hour and location.

(d) Proper location, depth and frequency of sampling are important while collecting the sample from lakes and reservoirs because quality of water changes considerably due to seasonal stratification, rainfall, runoff and wind.

(e) Samples for physical and chemical analysis should be collected in containers of pyrex glass or inert material like polythene.

(f) Sterilised glass bottles provided with ground glass stopper having an overlapping rim should be used. The stopper and the neck of the bottle should be protected by brown paper.