The bottles for the collection of samples shall have glass stoppers,
except when physical, mineral, or microscopical examinations only are to
be made. Jugs or metal containers shall not be used.
Sample bottles shall be carefully cleansed each time before using. This
may be done by treating with sulfuric acid and potassium bichromate, or
with alkaline permanganate, followed by a mixture of oxalic and sulfuric
acids, and by thoroughly rinsing with water and draining. The stoppers
and necks of the bottles shall be protected from dirt by tying cloth,
thick paper or tin foil over them.
For shipment bottles shall be packed in cases with a separate
compartment for each bottle. Wooden boxes may be lined with corrugated
fibre paper, felt, or similar substance, or provided with spring corner
strips, to prevent breakage. Lined wicker baskets also may be used.
Bottles for bacteriological samples shall be sterilized as directed on
page 98.