LaMotte 1200 Colorimeter - Manual (Page 39)

NOTE: If reading displays , repeat procedure on diluted sample, and multiply the
result by the appropriate dilution factor. See 1200 Colorimeter Instruction Manual for
procedure.
CAUTION: DO NOT leave reacted DPD samples in test tubes (0290). Discard sample
and thoroughly rinse tubes. If allowed to remain, DPD will stain tubes, significantly
impairing the operation of the 1200 Colorimeter. If necessary, acid wash, and vigorously
clean glassware with test tube brush and detergent.
CHLORINE DIOXIDE TEST METHOD SPECIFICATIONS
APPLICATION
Drinking and pool waters; domestic and industrial wastewater.
RANGE
0 to 7.0 ppm Chlorine Dioxide
METHOD
Chlorine dioxide reacts with DPD to form a red color in proportion to the
concentration.
HANDLING & PRESERVATION
Test as soon as possible to avoid loss of chlorine dioxide.
INTERFERENCES
Chlorine interference is eliminated by the addition of glycine to the sample before the
indicator.
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