Copper
Copper
Copper_PP_Low_POR_Eng_Ody.fm Page 3 of 6
Interferences
Sample Collection, Storage and Preservation
Collect samples in acid-washed plastic bottles. To preserve, adjust the pH to 2 or
less with nitric acid (about 5 mL per liter). Store preserved samples up to six
months at room temperature. Before testing, adjust the pH of the preserved
sample to between 2 and 6. If the sample is too acidic, adjust the pH with 5.0 N
Sodium Hydroxide Standard Solution (Cat. No. 2450-32). Correct test results for
volume additions; see Section 3.1.3 Correcting for Volume Additions on page 29.
Accuracy Check
Standard Additions Method (Sample Spike)
1. Prepare a 4000-µg/L copper standard by adding 4.00 mL Copper Standard
Solution, 100.0-mg/L, to a 100-mL volumetric flask. Dilute to 100 mL with
copper-free deionized water.
2. After reading test results, leave the sample cell (unspiked sample) in the
instrument.
3. Touch
Options. Touch Standard Additions. A summary of the standard
additions procedure will appear.
Interfering Substance Interference Levels and Treatments
Aluminum, Al
3+
60 mg/L
Cadmium, Cd
2+
10 mg/L
Calcium, Ca
2+
1500 mg/L
Chelating agents
Interfere at all levels unless either the Digesdahl or vigorous digestion is performed
(see Section 4 on page 55).
Chloride, Cl
–
90,000 mg/L
Chromium, Cr
6+
110 mg/L
Cobalt, Co
2+
100 mg/L
Fluoride, F
–
30,000 mg/L
Iron, Fe
2+
6 mg/L
Lead, Pb
2+
3 mg/L
Magnesium 10,000 mg/L
Manganese 140 mg/L
Mercury, Hg
2+
3 mg/L
Molybdenum 11 mg/L
Nickel, Ni
2+
60 mg/L
Potassium, K
+
60,000 mg/L
Sodium, Na
+
90,000 mg/L
Zinc, Zn
2+
9 mg/L
Highly buffered samples or
extreme sample pH
May exceed the buffering capacity of the reagents and require sample pretreatment; (see
Section 3.3 Interferences on page 41.)
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