Hanna Instruments hi 3831 User Manual

SPECIFICATIONS

Instruction Manual

h t t p : / / w w w . h a n n a i n s t . c o m

ISO 9000 Certified
Company since 1992

Dear Customer,
Thank you for choosing a Hanna Product. Please read the

instructions carefully before using the chemical test kit. It

will provide you with the necessary information for a correct

use of the kit.

Remove the chemical test kit from the packing material and

examine it carefully to make sure that no damage has

occurred during shipping. If there is any noticeable dam-

age, notify your Dealer or the nearest Hanna office

immediately.

Each kit is supplied with:

• Calibrated vessel (50 mL);

• Reagent 1 (30 mL);

• Reagent 2 (30 mL);

• Reagent 3 (30 mL);

• Color Comparison Cube.

Note: Any damaged or defective item must be returned in

its original packing materials.

SPECIFICATIONS

HI 3831
Chlorine

Test Kit

ISTR3831R1 02/98 PRINTED IN ITALY

Range

0 to 2.5 mg/L (ppm) Chlorine

Analysis Method

Colorimetric

Sample Size

5 mL

Number of Tests

110 (average)

Case Dimensions

200x120x60 mm (7.9x4.7x2.4")

Shipping Weight

460 g (1 lb.)

In pools and drinking water supplies, chlorination serves to
kill or deactivate disease-producing microorganisms. It can
also improve water quality by reacting with ammonia, iron,
sulfide and some organic substances. However, an excessive
concentration of chlorine in water can produce adverse con-
ditions, such as formation of carcinogenic chloroform or
other toxins. To maximize the purpose for chlorination and

minimize any adverse effects, it is essential to monitor the
chlorine levels closely.
The Hanna Chlorine Test Kit determines the Chlorine con-
centration in water via a color cube. This makes the test kit
practical for field use. No iodine or bromine can be present
for this test to work properly.

SIGNIFICANCE AND USE

CHEMICAL REACTION

The addition of chlorine to water produces hydrochloric and

hypochlorous acids. The hypochlorous acid acts as the disin-
fectant and bleaching agent. These are known as free
chlorine. The formation of chloroamines and nitrogen trichlo-
ride will occur if ammonia is present. These are known as
bound chlorine. Both, free and total chlorine are measured
by a colorimetric method. The sample is initially treated
with a phosphate buffer to a pH of approximately 6.3 pH.

The addition of DPD (N,N-diethyl-p-phenylenediamine) is
immediately oxidized by chlorine producing a reddish color.
The color intensity of the solution determines the free chlo-
rine concentration. The total chlorine determination requires
an excess addition of iodide ions to the solutions. The iodide
ions react with chloroamines and form iodine. The iodine
readily oxidizes the DPD, thus adding to the red color.

REFERENCES

Standard Methods for the Examination of Water and Waste-
water, 16

Edition, 1985, pages 309-310.

ACCESSORIES

HI 3831-100 Spare reagents (100 tests)

INSTRUCTIONS

READ ALL THE INSTRUCTIONS BEFORE USING THE TEST KIT
Free Chlorine
• Add 5 drops of Reagent 1 and 3 drops of Reagent 2 to

the color comparison cube and mix by carefully swirling
the cube in tight circles.

• Remove the cap from the plastic vessel. Rinse the plastic

vessel and fill to the 5 mL mark with water sample.

• Transfer the 5 mL water sample from the plastic vessel

into the color comparison cube. Replace the cap and

mix it by inverting several times.

• Determine which color band best matches the

solution in the vessel and record the results in
mg/L (ppm) free chlorine.

Total Chlorine
• Add 5 drops of Reagent 1, 2 drops of Reagent 3 and 3

drops of Reagent 2 to the color comparison cube.

• Mix by carefully swirling the cube in tight circles.

• Remove the cap from the plastic vessel. Rinse the plastic

vessel and fill to the 5 mL mark with water sample.

• Transfer the 25 mL water sample from the plastic vessel

into the color comparison cube. Replace the cap and
mix it by inverting several times.

• Determine which color band best matches the

solution in the vessel and record the results in
mg/L (ppm) total chlorine.

Bound Chlorine
• The concentration of bound chlorine in the sample is

determined by subtracting the free chlorine result from

the total chlorine result.