Copper ~ high range – LaMotte DC1600 Colorimeter User Manual
Page 33
COPPER ~ HIGH RANGE
DIETHYLDITHIOCARBAMATE METHOD
CODE 3646
QUANTITY
CONTENTS
CODE
15 mL
*Copper Reagent
*6446-E
*WARNING: Reagents marked with a * are considered hazardous substances. Material Safety Data Sheets (MSDS) are supplied for
these reagents. For your safety, read label and accompanying MSDS before using.
The copper content of drinking water generally falls below 0.03 parts per million, but copper levels as high as 1.0 parts 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 fittings. This
corrosion results in the addition of copper into the water supply.
APPLICATION:
Drinking, surface, and saline waters; domestic and industrial wastes.
RANGE:
0 – 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.
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 in the optimum pH range.
INTERFERENCES:
Bismuth, cobalt, mercurous, nickel and silver ions and chlorine (6 ppm or greater) interfere
and must be absent.
PROCEDURE
1.
Rinse a clean colorimeter tube (0967) with sample water. Fill to the 10 mL line with sample.
2.
Select setting 2 on “Select Wavelength” knob and press “30 Second Read” button.
3.
Insert tube into colorimeter chamber and adjust to 100%T with “Set Blank” knob. This is the 100%T blank.
4.
Remove tube from colorimeter and add 5 drops of *Copper Reagent (6446). Cap and mix. Solution will turn yellow
if copper is present.
5.
Press “30 Second Read” button and insert tube into colorimeter chamber. Record %T as soon as reading stabilizes.
6.
Consult calibration chart to determine copper concentration in parts per million (ppm).
DC1600 COPPER ~ HIGH RANGE CALIBRATION CHART
%T
9
8
7
6
5
4
3
2
1
0
90
0.003
0.021
0.040
0.059
0.077
0.097
0.116
0.135
0.155
0.175
80
0.195
0.215
0.236
0.257
0.278
0.299
0.321
0.343
0.365
0.387
70
0.410
0.433
0.456
0.480
0.503
0.528
0.552
0.577
0.602
0.628
60
0.654
0.680
0.707
0.734
0.761
0.789
0.818
0.847
0.876
0.906
50
0.936
0.967
0.998
1.030
1.062
1.096
1.129
1.164
1.199
1.234
40
1.271
1.308
1.346
1.385
1.424
1.465
1.506
1.549
1.592
1.636
30
1.682
1.729
1.777
1.826
1.877
1.929
1.983
2.039
2.096
2.155
20
2.216
2.279
2.345
2.413
2.484
2.557
2.634
2.714
2.798
2.886
10
2.978
3.076
3.179
3.288
3.404
3.529
3.662
3.806
3.963
4.135
0
4.325
4.537
4.778
5.056
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