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Zero
13.
Touch
.
Zero
The display will show:
3–
0.0 mg/L PO
4
Underrange
Interferences
Sample Collection, Storage, and Preservation
PhosphorusTot_UniCell_APD_Eng_Ody.fm
14.
Place the prepared
sample vial into the cell
adapter.
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.
Interfering Substance
2–
SO
4
–
Cl
+
+
K
, Na
2+
Ca
2+
Mg
2+
2+
3+
2+
2+
Co
, Fe
, Fe
, Zn
, Cu
2+
+
2+
3+
Cd
, NH
, Mn
, Al
, CO
4
–
I
SiO
2
2+
Hg
2+
Sn
2+
Pb
+
3+
Ag
, Cr
6+
Cr
Analyze samples within 3 hours after collection for best results. Store in a cool
dry place in plastic or glass bottles that have been acid cleaned with 1:1
Hydrochloric Acid Solution and rinsed with deionized water. Do not use
commercial detergents containing phosphate for cleaning glassware used in
this test.
Read
15.
Touch
.
Read
Results will appear in
3–
mg/L PO
.
4
2+
–
, Ni
, NO
,
2
2–
3
Phosphorus, Total
No interference up to:
20 g/L
10 g/L
4 g/L
1 g/L
400 mg/L
200 mg/L
100 mg/L
50 mg/L
40 mg/L
25 mg/L
20 mg/L
10 mg/L
1 mg/L
Phosphorus, Total
Page 3 of 6
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