1—34
Bromine, Total, HR, continued
Hardness No effect at less than 1,000 mg/L as CaCO
3
Iodine, I
2
Interferes at all levels
Manganese,
Oxidized
(Mn
4+
, Mn
7+
) or
Chromium,
Oxidized (Cr
6+
)
1. Adjust sample pH to 6–7.
2. Add 3 drops Potassium Iodide (30-g/L) (Cat. No. 343-32) to
a 25-mL sample.
3. Mix and wait one minute.
4. Add 3 drops Sodium Arsenite (5-g/L) (Cat. No. 1047-32)
and mix.
5. Analyze 10 mL of the treated sample as described in
the procedure.
6. Subtract the result of this test from the original analysis
result to obtain the correct chlorine concentration.
Monochloramine Interferes at all levels.
Ozone Interferes at all levels.
Interfering
Substance
Interference Levels and Treatments
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