Hach DR2400 - Page 740

Sulfate
Sulfate
Page 2 of 4
Sulfate_UniCell_Other_Turb_Eng_Ody.fm
Interferences
The ions listed in the following table have been individually tested up to the
given concentrations. Cumulative effects and the influence of other ions have
not been evaluated.
Sample Collection, Storage, and Preservation
Analyze samples within 3 hours after collection for best results. Samples may be
stored up to 28 days at 4 °C (39 °F). Warm samples to room temperature before
analysis.
Accuracy Check
Standard Additions Method (Sample Spike)
1. After reading test results, leave the sample cell (unspiked sample) in the
instrument.
2. Touch
Options. Touch Standard Additions. A summary of the standard
additions procedure will appear.
5. Wipe the outside of
the zero (white cap) and
sample vials with a damp
towel, followed by a dry
one, to remove
fingerprints or other
marks.
6. Install the 16-mm cell
adapter.
Note: See Section 2.6 Sample
Cell Adapters in the Instrument
Manual for adapter installation
details.
Place the zero vial into the
cell adapter.
7. Touch Zero.
The display will show:
0 mg/L SO
4
2–
Underrange
8. Place the sample in
the cell adapter.
Touch
Read.
Results will appear in
mg/L SO
4
2–
.
Zero
Interfering Substance No interference up to:
K
+
, Na
+
2000 mg/L
Ca
2+
, NO
3
–
, Cl
–
1000 mg/L
Cd
2+
, Cr
3+
, Cu
2+
, Fe
2+
, Fe
3+
, Mg
2+
, Mn
2+
,
NH
4
+
, Ni
2+
, Si
2+
, Sn
2+
, Zn
2+
500 mg/L
Al
3+
, Pb
2+
, Hg
2+
, PO
4
3–
, CO
3
2–
, I
–
, CN
–
, NO
2
–
50 mg/L
Cr
6+
20 mg/L
Ag
+
2.5 mg/L