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THE EFFECT OF THIOSULPHATE AND OF PHOSPHATE ON THE BACTERICIDAL ACTION OF COPPER AND ZINC IN SAMPLES OF WATER
Author(s) -
HOATHER R. C.
Publication year - 1957
Publication title -
journal of applied bacteriology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 0021-8847
DOI - 10.1111/j.1365-2672.1957.tb00090.x
Subject(s) - copper , zinc , chemistry , chlorine , bottle , phosphate , sampling (signal processing) , metallurgy , galvanization , materials science , biochemistry , engineering , filter (signal processing) , organic chemistry , layer (electronics) , electrical engineering , composite material
SUMMARY: Because of the increased use of copper and galvanized pipes, samples of water for bacteriological examination not infrequently contain minute traces of copper or zinc. These metals have a fairly rapid bactericidal action in the sampling bottle. The bactericidal action of copper can be prevented by the thiosulphate used for neutralizing chlorine; 100 mg/l is a useful quantity for general use in all sampling bottles. The bactericidal action from zinc can be prevented by the use of a small quantity of sodium phosphate in the sampling bottle. When special sampling points are installed, copper or galvanized pipes should be avoided.