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Correction of Color Measurements to Standard Conditions
Author(s) -
Singley J. E.,
Harris R. H.,
Moulding J. S.
Publication year - 1966
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.1966.tb01604.x
Subject(s) - colored , statistics , value (mathematics) , degree (music) , mathematics , materials science , physics , composite material , acoustics
Because of the low buffer capacity of most naturally colored waters, difficulties were encountered in adjusting the pH to an exact value. By utilizing data from the analyses of a large number of colored surface waters from various parts of the United States, the nomograph was constructed. This nomograph allows the determination of color at the standard condition of pH 8.3 from the color value at any other pH. Comparison with the data of Behrman and co‐workers and Black and Christman, shows a good degree of agreement. Use of the nomograph results in a considerable saving of time and, in most cases, in increased accuracy. The color value read from the nomograph generally is subject to less error than an equivalent color value obtained by normal variation in pH adjustment.