LaMotte SMART Spectro Spectrophotometer - Manual (Page 138)

COPPER, DDC
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 Material Safety Data Sheet (MSDS) for these reagents
go to www.lamotte.com. To obtain a printed copy, contact LaMotte by e-mail,
phone or fax.
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: Cupric ions form a yellow colored chelate with
diethyldithiocarbamate around pH 9-10 in proportion to
the concentration of copper in the sample.
Drinking, surface, and saline waters; domestic and
industrial wastes.
RANGE: 0.00–6.00 ppm Copper
ML: 0.05 ppm
METHOD: Cupric 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.
SMART Spectro Test Procedures 2.11 COPPER, DDC
Test P
rocedures