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CHLORINE, FREE, Ultra-high Range, continued
Method Performance
Interferences
Interfering Substance
Acidity
Alkalinity
Bromine, Br
2
Chlorine Dioxide, ClO
2
Chloramines, organic
Iodine, I
2
Manganese, oxidized (Mn
7+
Mn
) or Chromium, oxi-
6+
dized (Cr
)
Precision
In a single laboratory, using a chlorine standard solution of
5.05 mg/L Cl
2
operator obtained a standard deviation of ± 0.05 mg/L Cl
Estimated Detection Limit
The estimated detection limit for Method 10069 is 0.1 mg/L Cl
For more information on the estimated detection limit, see
Section 1 of the DR/800 Procedure Manual.
Greater than 150 mg/L CaCO
instantly.
1.
Neutralize to pH 6–7 with 1 N Sodium Hydroxide.
2.
Determine amount to be added on a separate sample aliquot, then add the
same amount to the sample being tested.
3.
Correct for volume addition.
Greater than 250 mg/L CaCO
instantly.
1.
Neutralize to pH 6–7 with 1 N Sulfuric Acid.
2.
Determine amount to be added on a separate sample aliquot, then add the
same amount to the sample being tested.
3.
Correct for volume addition.
Interferes at all levels
Interferes at all levels
May interfere
Interferes at all levels
4+
,
1.
Adjust sample pH to 6–7.
2.
Add 2 drops Potassium Iodide (30 g/L) to a 5-mL sample.
3.
Mix and wait 1 minute.
4.
Add 2 drops of Sodium Arsenite (5 g/L) and mix.
5.
Analyze the treated sample as described in the procedure.
6.
Subtract the result from this test from the original analysis to obtain the
correct chlorine concentration.
and representative lots of reagent, a single
Interference Levels and Treatments
. May not develop full color or color may fade
3
. May not develop full color or color may fade
3
104
.
2
.
2
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