Nickel
Nickel
Nickel_PP_Other_HEP_Eng_Ody.fm Page 3 of 6
Interferences
Cobalt, copper, and iron interferences can be overcome by adding additional
Nickel 1 Reagent Powder Pillows in step 3. The tolerance limits of these
interferences are shown in the following table:
A preliminary acid digestion is required to determine any suspended or
precipitated nickel and to eliminate interference by organic matter. To eliminate
this interference or to determine total recoverable nickel perform the USEPA
approved digestion in 2.3 Digestion.
Sample Collection, Storage and Preservation
Collect samples in acid-washed plastic bottles. Adjust the sample pH to 2 or less
with Nitric Acid (Cat. No. 2540-49), about 5 mL per liter. Preserved samples can
be stored up to six months at room temperature. Before analysis, adjust the
sample pH to between 3–8 with 5.0 N Sodium Hydroxide Standard Solution
(Cat. No. 2450-53). Do not exceed pH 8 as this may cause some loss of nickel as a
precipitate. Correct the test results for volume additions; see Section 3.1.3
Correcting for Volume Additions on page 29.
13. Fill a second cell with
25 mL of chloroform.
(This is the blank.)
Cap the cell.
14. Wipe the blank and
place it into the cell
holder.
15. Touch Zero.
The display will show:
0.00 mg/L Ni
16. Wipe the prepared
sample and place it into
the cell holder.
Touch
Read.
Results will appear in
mg/L Ni.
10 mL
20 mL
25 mL
10 mL
20 mL
25 mL
Zero
10 mL
20 mL
25 mL
Pillows of Nickel 1 Reagent
Tolerance Limit (mg/L):
Cobalt Copper Iron
1 1 10 20
2 7 16 65
31322110
41828155
52535200
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