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2 Taking Measurements
2.7 Ion measurement (D-53)
48
Effects of interfering ions
ION
electrode
Potassium
+
Li
, Ma
+
K
NH
4
(at 10
Calcium
+
Na
2+
Ca
500; Co
2+
Fe
(at 10
Chloride
NO
3
-
Cl
SCN
S
O
2
(at 10
Fluoride
-
OH
-
F
Nitrate
SO
4
-
NO
-
3
Cl
= 40; NO
-
Br
= 2
(at 10
Ammonia
Volatile amino (within measurable range)
NH
3
Measurements cannot be made when the compatible
tolerance limit multiplied by the concentration of the ions
to be measured is greater than the compatible ION
concentration.
Compatible tolerance limits
+
2+
2+
, Mg
, Ca
+
+
= 70; Cs
= 3; Rb
-4
+
mol/L K
)
+
2+
+
, K
, Ba
, NH
, Mg
4
2+
4+
= 350; Ni
2+
3+
, Zn
= 1; Fe
= 0.1
-4
2+
mol/L Ca
)
-
-
-
, F
, HCO
, SO
3
4
-
-
= 0.3; MnO
= 0.1; Br
4
2-
2-
-
+
, S
, I
, Ag
, Hg
3
-3
-
mol/L Cl
)
= 10 (within measurable range)
2-
= 1000; CH
COO
3
-
-
= 3; I
= 0.1; ClO
2
-3
-
mol/L NO
)
3
2+
2+
, Sr
, Ba
= 1,000;
+
= 0.4
2+
= 1,000; Mn
2+
2+
, Cu
= 70; Sr
= 50;
2-
2-
, PO
= 1000;
4
-
= 0.03;
2+
= not possible
-
-
= 300; F
= 200;
-
= 0.03;
4
HORIBA
2+
=
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