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When the timer beeps,
introduce the contents of
the cylinder into the Pour-
Thru Cell. When the flow
stops, touch
.
Read
The result in µg/L
chlorine will appear.
Interferences
Interfering Substance
Bromine, Br
2
Chlorine Dioxide, ClO
2
Chloramines, organic
2+
Copper, Cu
Iodine, I
2
3+
Iron (Fe
)
Manganese, Oxidized
4+
7+
(Mn
, Mn
) or Chromium,
6+
Oxidized (Cr
)
–
Nitrite, NO
(uncommon in
2
clean waters)
Ozone, O
3
Peroxides
Extreme sample pH or highly
buffered samples
* Samples treated with sodium arsenite for manganese or chromium interferences will be hazardous wastes as regulated by the
Federal RCRA for arsenic (D004). See Section 4 for more information on proper disposal of these materials.
ChlorineTot_PT_ULow_DPD_Eng_Ody.fm
13.
Use this value to
correct the sample result
obtained in this
procedure.
Interferes at all levels
Interferes at all levels
May interfere
Greater than 1000 µg/L
Interferes at all levels
Greater than 1000 µg/L
1. Adjust sample pH to 6–7.
2. Add 6 drops Potassium Iodide (Cat. No. 343-32) (30-g/L) to a 50-mL sample.
3. Mix and wait 3 minutes.
4. Add 6 drops Sodium Arsenite* (Cat. No. 1047-32) (5-g/L) and mix.
5. Analyze the treated sample as described in the procedure.
6. Subtract the result of this test from the original analysis to obtain the correct
chlorine concentration.
mg/L nitrite
2.0 mg/L
5.0 mg/L
10.0 mg/L
15.0 mg/L
20.0 mg/L
Interferes at all levels
May interfere
Adjust to pH 6 –7. See Section 3.3 Interferences on page 41.
Note: See Creating a User
Program Based on a Hach
Program in the instrument
manual for details on saving a
reagent blank value.
Interference Levels and Treatments
Apparent µg/L chlorine
Chlorine, Total
14.
Flush the Pour-Thru
Cell with at least 50 mL of
deionized water
immediately after use.
3 µg/L
5 µg/L
7 µg/L
16 µg/L
18 µg/L
Chlorine, Total
Page 5 of 8
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