85
INTERFERENCES
Interference may be caused by:
Co
2+
must not be present
Fe
2+
must not be present
Al
3+
above 32 mg/L
Ca
2+
above 1000 mg/L (as CaCO
3
)
Cd
2+
above 20 mg/L
Cl¯ above 8000 mg/L
Cr
3+
above 20 mg/L
Cr
6+
above 40 mg/L
Cu
2+
above 15 mg/L
F¯ above 20 mg/L
Fe
3+
above 10 mg/L
K
+
above 500 mg/L
Mg
2+
above 400 mg/L
Mn
2+
above 25 mg/L
Mo
6+
above 60 mg/L
Na
+
above 5000 mg/L
Pb
2+
above 20 mg/L
Zn
2+
above 30 mg/L
Nickel LR