54
METHOD PROCEDURES
54
54
IRON(II)/(III)
• Press Chem Frm to cycle through the available chemical forms of Fe
2+
+Fe
3+
and Fe
2+
.
Note: Each chemical form can be logged independently by pressing the LOG key.
• Press the or key to return to the measurement screen.
INTERFERENCES
Interference may be caused by:
• Chloride, Sulfate above 1000 mg/L
• Ammonium, Calcium, Potassium, Sodium above 500 mg/L
• Silver above 100 mg/L
• Carbonate, Chromium(III) and (VI), Cobalt, Lead, Mercury, Nitrate, Zinc above 50 mg/L
• Nickel above 25 mg/L
• Copper above 10 mg/L
• Tin above 5 mg/L
• Extreme pH or highly buffered samples, the pH of the sample must be between 3.8 and 5.5 after
addition of the reagents
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