Hach DR2400 - Page 418

Nickel
Nickel
Page 2 of 4
Nickel_UniCell_Other_DIMETH_Eng_Ody.fm
Interferences
The ions listed in the table have been tested up to the given concentrations.
Cumulative effects and the influence of other ions have not been evaluated.
Sample Collection, Storage, and Preservation
Collect samples in acid-cleaned or plastic containers. No acid addition is
necessary if analyzing the samples immediately. To preserve samples, adjust the
pH to 2 or less with concentrated nitric acid (about 2 mL per liter). Preserved
samples may be stored up to six months at room temperature.
Before analysis, adjust the pH to between 3–8 with 5.0 N Sodium Hydroxide
Standard Solution. Do not exceed pH 8 or nickel may precipitate.
5. Touch the timer icon.
Touch
OK.
A 3-minute reaction
period will begin.
6. Install the 16-mm cell
adapter.
Note: See Section 2.6 Sample
Cell Adapters in the Instrument
Manual for adapter installation
details.
Wipe the zeroing vial
(white cap) and place it
into the cell adapter.
7. Touch Zero.
The display will show:
0.00 mg/L Free Ni
Underrange
Note: If the sample was
pretreated with the Metal Prep
Set (HCT 200), display units
will show: mg/L Tot. Ni
8. Wipe the sample vial
and place the prepared
sample into the
celladapter.
Touch
Read.
Results will appear in
mg/L Free Ni.
Zero
Interfering Substance Interference Levels
Cl
–
, Na
+
, K
+
, SO
4
2–
1000 mg/L
NH
4
+
, Ca
2+
, PO
4
3–
, CO
3
2–
500 mg/L
Cr
6+
, Zn
2+
, F
–
, NO
2
–
50 mg/L
Al
3+
, Cr
3+
, Cd
2+
, Co
2+
, Sn
2+
, Pb
2+
10 mg/L
Fe
2+
, Fe
3+
, Mn
2+
, Cu
2+
, Mg
2+
, Hg
2+
5 mg/L
Ag
+
1 mg/L