Hach DR/850 Procedures Manual page 112

CHLORINE, TOTAL, Ultra-High Range, continued
Method Performance
Interferences
Interfering Substance
Acidity
Alkalinity
Bromine, Br
2
Chlorine Dioxide, ClO
2
Chloramines, organic
Iodine, I
2
4. Calculate the concentration of mg/L chlorine added to each
sample.
mg/L chlorine added =
The spiked sample results should reflect the analyzed sample
result plus the calculated mg/L Cl
increases do not occur, see Standard Additions in Section 1 of a
DR/800 Procedure Manual for more information.
Precision
In a single laboratory, using a chlorine standard solution of
5.05 mg/L Cl and representative lots of reagent, a single
2
operator obtained a standard deviation of ± 0.05 mg/L Cl
Estimated Detection Limit
The estimated detection limit for Method 10070 is 0.05 mg/L Cl
For more information on the estimated detection limit, see
Section 1 of a DR/800 Procedure Manual.
Interference Levels and Treatments
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
112
×
volume of standard added label value of Cl
------------------------------------------------------------------------------------------------------------------------------------------------------ -
sample volume + volume of standard added
added to each sample. If these
2
. May not develop full color or color may fade
3
. May not develop full color or color may fade
3
standard ampule
2
.
2
.
2