Laboratory manual for physicians : aids in diagnosis and treatment.

  • New York (State). Department of Health. Division of Laboratories and Research.
Date:
1940
Catalogue details

Licence: Public Domain Mark

Credit: Laboratory manual for physicians : aids in diagnosis and treatment. Source: Wellcome Collection.

    97/108 (page 95)
    Collection of Samples of Water a Fia. 2 Label each sample with an identifying letter and the name of the city, town, or village, and enter the corresponding identifica- tion on the descriptive card of inspection. When the wooden outfit is used, the ice can should be filled with cracked ice to provide refrigeration during transit. In no ease should the sample itself be packed in the ice in this can; the bottle should be returned to its container and placed in position adjacent to the can. The can should never be used for the submission of samples of water for chemical or other examination. Samples from newly constructed or recently cleaned wells should be identified as such; at least a week should elapse between the time water is first pumped and the collection of the samples. The well should be pumped frequently during the interim. From five to ten pails of water should be’ pumped from a well before a sample is collected. If there is any overflow or splashing back into the well during sampling, this fact should be recorded. Pails or buckets that are used for taking samples should be carefully cleaned and thoroughly rinsed with boiling water. In ponds, reservoirs, or streams, samples should be taken in a sufficient depth of water to avoid disturbing the sediment or other- wise affecting the usual conditions. Grasping the bottle in the right hand near the bottom, plunge it mouth downward well under the surface, keeping the hand on the downstream side of the bottle; then carry the bottle upstream under the surface and out of the water, all in one continuous motion. Great care should be taken to avoid having the water flow over the hand into the bottle. The bottle should be plunged quickly below the surface and removed quickly to prevent entrainment of any surface scum. In rapidly flowing water the bottle may be held upstream and allowed to fill in this manner. Samples for chemical analysis. The large bottle for the chemical sample is clean but not sterile. Selection of sampling