LaMotte 1200 Colorimeter - Manual (Page 47)

NOTE: If test reading displays , repeat procedure on diluted sample, and multiply
the result by the appropriate dilution factor. See 1200 Colorimeter Instruction Manual
for procedure.
COPPER TEST METHOD SPECIFICATIONS
APPLICATION
Drinking, surface, and saline waters; domestic and industrial wastes.
RANGE
0 to 5.0 ppm Copper
METHOD
Cupric ions form a yellow colored chelate with diethyldithiocarbamate around pH 9-10
in proportion to the concentration of copper in the sample.
HANDLING & PRESERVATION
Copper has a tendency to be absorbed to the surface of the sample container. Samples
should be analyzed as soon as possible after collection. If storage is necessary, 0.5 mL of
20% hydrochloric acid per 100 mL of sample will prevent “plating out.” However, a
correction must be made to bring the reaction into the optimum pH range.
INTERFERENCES
Bismuth, cobalt, mercurous, nickel and silver ions and chlorine (6 ppm or greater)
interfere and must be absent.
er2