LaMotte COD3 Plus, Operator'S Manual

Page: 65 / 119

COD3 Plus Colorimeter 10.16
COPPER
, Thiocarbamate
COPPER
DIETHYLDITHIOCARBAMATE METHOD • CODE 3646-SC
QUANTITY CONTENTS CODE
15 mL *Copper 1 *6446-E
*WARNING: Reagents marked with an * are considered to be potential health hazards.
To view or print a Safety Data Sheet (SDS) for these reagents go to www.lamotte.com.
Search for the four digit reagent code number listed on the reagent label, in the
contents list or in the test procedures. Omit any letter that follows or precedes the
four digit code number. For example, if the code is 4450WT-H, search 4450. To obtain
a printed copy, contact LaMotte by email, phone or fax.
Emergency information for all LaMotte reagents is available from Chem-Tel:
(US, 1-800-255-3924) (International, call collect, 813-248-0585).
The copper content of drinking water generally falls below 0.03 parts per million,
but copper levels as high as 1.0 part per million will give water a bitter taste. Waters
testing as high as 1.0 part per million copper have probably been treated with a copper
compound, like those used in the control of algae, or have become contaminated from
untreated industrial wastes. The addition of copper sulfate to lakes causes an increase
in the copper content of the sediments. Acid waters and those high in free carbon
dioxide may cause the corrosion or “eating away” of copper, brass and bronze pipes
and fi ttings. This corrosion results in the addition of copper into the water supply.
APPLICATION: Drinking, surface, and saline waters; domestic and
industrial wastes.
RANGE: 0.00–6.00 ppm Copper
MDL: 0.10 ppm
METHOD: Copper ions form a yellow colored chelate with
diethyldithiocarbamate around pH 9-10 in proportion to
the concentration of copper in the sample.
SAMPLE HANDLING &
PRESERVATION: Copper has a tendency to be adsorbed 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.
Testing