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TECHNICAL SUPPORT, continued
General Chemistry
“Measurement of Color and Insoluble Matter in Reagent Chemicals”.
By Clifford C. Hach. Reprinted from American Laboratory, June, 1983.
When results from colorimetric and turbidimetric tests are compared
with traditional gravimetric measurements, the colorimetric tests are
shown to offer more sensitive and useful information about insoluble
and color-related impurities.
“Spectrophotometric Determination of Chlorine Dioxide”. By Daniel L.
Harp, R.L. Klein Jr., and D.J Schoonover. Reprinted from Journal
American Water Works Association, Vol. 73, No. 7, July, 1981.
Spectrophotometric procedures based on the oxidation of chlorophenol
red, a pH indicator, can determine trace amounts of chlorine dioxide in
water.
Microbiology
The Use of Indicator Organisms to Assess the Safety of Public Water. By
Sharon Sloat and Carol Ziel, 1987.
Describes how indicator organisms are used as the basis for most
microbiological quality standards. The topics covered are: indicator
organisms, drinking water standards, methods for the enumeration of
indicator and opportunistic organisms, media formulations and
preparation and references.
pH Measurement
“A Common Source of Error in pH Measurement”. By John A
Illingsworth. Reprinted from Biochemical Journal, Vol. 195, pages 259-
262, 1981.
Studies the reference junction as a source of error in pH measurements.
The reference junctions of 30 electrodes selected at random from seven
laboratories were compared to the ideal of 7.06 ±0.01 pH. Twenty-four
of the electrodes failed,
“Low Ionic Strength pH Measurement”. By Alan Kopelove, Stanley
Franklin and Gale McGaha Miller. Reprinted from American
Laboratory, June, 1989.
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