Test Procedures
APPLICATION:
Drinking, surface, and saline waters; swimming pool water;
domestic and industrial wastes.
RANGE:
The various pH indicators exhibit a specifi c color change
over a narrow pH range. The color changes are measured
colorimetrically.
METHOD:
Sample should be analyzed immediately after collection.
SAMPLE HANDLING &
PRESERVATION:
Sample color and turbidity interfere with the colorimetric
pH measurement. Color interference may be removed by
standardizing the instrument with the original water sample.
Two drops of 0.1N sodium thiosulfate per 100 mL of sample
will eliminate chlorine interference.
INTERFERENCES:
pH Indicator
pH
SMART Spectro
Test Range
Chlorphenol Red
5.0–7.0
74 pH CPR
Phenol Red
6.6–8.4
75 pH PR
Thymol Blue
8.0–9.5
76 pH TB
pH
SMART Spectro 2 Test Procedures 05.02.16
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