Hach POCKET COLORIMETER II Instruction Manual

1—35
Chlorine, Free and Total, LR, 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 10-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 from this test from the original
analysis to obtain the correct chlorine concentration.
Interfering
Substance
Interference Levels and Treatments
5957088.book Page 35 Friday, March 22, 2013 3:54 PM

Hach POCKET COLORIMETER II Specifications

General

Measurement Method	Colorimetric
Display	LCD
Operating Temperature	0 to 50 °C
Storage Temperature	-40 to 60 °C
Waterproof Rating	IP67
Weight	0.23 kg
Light Source	LED
Range	Varies by parameter
Wavelength	Varies by parameter
Battery Life	Approximately 2000 tests