Hanna Instruments HI 3820 User Manual

Hi 3820 acidity test kit

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SPECIFICATIONS

Instruction Manual

www.hannainst.com

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 correct

use of the kit.

Range

0 to 100 mg/L (ppm) CaCO

0 to 500 mg/L (ppm) CaCO

Smallest Increment 1 mg/L [in the 0-100 mg/L range]

5 mg/L [in the 0-500 mg/L range]

Analysis Method Base titration using phenolphthalein

and bromphenol blue indicators

Sample Size

5 mL and 25 mL

Number of Tests

110 (average)

Case Dimensions

260x120x60 mm (10.2x4.7x2.4")

Shipping Weight

910 g (34.0 oz.)

SPECIFICATIONS

HI 3820

Acidity Test Kit

ISTR3820R2

12/01

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:

• Dechlorinating reagent, 1 bottle with dropper (10

mL);

• Bromophenol Blue Indicator, 1 bottle with dropper

(10 mL);

• Phenolphtalein Indicator, 1 bottle with dropper (10

mL);

• HI 3820-0, 1 bottle (120 mL);

• 2 calibrated vessels (10 and 50 mL);

• 1 calibrated syringe.

Note: Any damaged or defective item must be returned in

its original packing materials.

Acidity is the quantitative capacity of a water sample to

neutralize a base to a set pH. Therefore, the greater

acidity, the more potentially corrosive the water. Acidity can

be caused by mineral acids, organic acids and carbon

dioxide in the form of carbonic acid. Today, our water

supplies are becoming more contaminated with corrosive

chemicals from industrial dumping or acid rain. Therefore,

acidity measurements are an essential monitoring device to

define and control pollution in sewers, lakes and rivers.

Acidity of water is equally important to monitor in soils and

fish farming to maximize the growing environment.

The Hanna Acidity Test Kit is equipped with all you need to

determine acidity of water. The kit is quick, easy to use and

portable. This makes it practical for field as well as labora-

tory use. The design makes the kit easy to handle and,

except for HI 3820-0, practically prevents accidental injury

or damage due to spills.

Note: mg/L is equivalent to ppm (parts per million).

SIGNIFICANCE AND USE

CHEMICAL REACTION

Strong acids (such as mineral acids) and organic acids can

contribute to the acidity of a water sample. With the use of

diluted sodium hydroxide as the titrant and bromphenol

blue or phenolphthalein indicators, the contribution of

strong or organic acids can be determined. The measure-

ment of the strong acid contribution to the sample acidity is

known as methyl orange acidity. This is carried out by

titrating with sodium hydroxide until the solution turns from

yellow to green/blue (pH endpoint about 4.5). The total

acidity caused by both mineral and organic acids is deter-

mined by titrating to an endpoint pH of 8.3, using

phenolphthalein as an indicator. This is known as phenol-

phthalein acidity.

INSTRUCTIONS

READ ALL THE INSTRUCTIONS BEFORE USING THE TEST KIT

LOOK AT THE BACK PAGE FOR THE ILLUSTRATED PROCEDURE
Note: Push and twist pipet tip onto tapered end of syringe

ensuring an air tight-fit.

Determination of Methyl Orange Acidity

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

vessel with water sample, fill to the 5

mL mark and replace the cap.

• Add 1 drop of Dechlorinating reagent

through the cap port and mix by

carefully swirling the vessel in tight circles.

x 500 = mg/L CaCO

x 100 = mg/L CaCO

• Through the cap port, add 1 drop of Bromophenol Blue

indicator and mix. If the solution is green or blue, then

record the methyl orange acidity as zero. Proceed with

procedure for the determination of phenolphthalein acidity.

If the solution is yellow proceed with the next step.

• Take the titration syringe and push the plunger

completely into the syringe. Insert tip into HI

3820-0 solution and pull the plunger out until

the lower edge of the plunger seal is on the

0 mL mark of the syringe.

• Place the syringe tip into the cap port of the

plastic vessel and slowly add the titration

solution drop-wise, swirling to mix after each

drop. Continue adding titration solution until

the solution in the plastic vessel changes from

yellow to green.

• Read off the milliliters of titration solution from the syringe

scale and multiply by 500 to obtain mg/L (ppm) CaCO

Determination of Phenolphthalein Acidity

• Remove the cap from the small plastic

vessel. Rinse the vessel with water

sample, fill to the 5 mL mark and

replace the cap.

• Through the cap port, add 1 drop of Phenolphtalein

indicator and mix. If the solution turns red or pink,

then the solution is alkaline and an alkalinity test must

be carried out (see Hanna Alkalinity Test Kit – HI

3811). If the solution remains colorless, proceed to next

step.

REFERENCES

1987 Annual Book of ASTM Standard, Volume 11.01

Water (1), pages 151-158.

Official Methods of Analysis, A.O.A.C., 14

Edition, 1984,

page 618.

Standard Methods for the Examination of Water and Waste-

water, 18

Edition, 1992, pages 2-23, 2-24.

ACCESSORIES

HI 3820-100 Spare reagents (100 tests)

HEALTH AND SAFETY

• Take the titration syringe and push the

plunger completely into the syringe. Insert tip

into HI 3820-0 solution and pull the plunger

out until the lower edge of the plunger seal is

on the 0 mL mark of the syringe.

• Place the syringe tip into the cap port of the

plastic vessel and slowly add the titration

solution dropwise, swirling to mix after each

drop. Continue adding titration solution until

the solution in the plastic vessel turns pink.

• Read off the milliliters of titration solution from the syringe

scale and multiply by 500 to obtain mg/L (ppm) CaCO

Low Range Determinations

If result is lower than 100 mg/L, the precision of the test

can be improved.

• Remove the cap from the large

plastic vessel. Rinse the vessel with

water sample, fill to the 25 mL

mark and replace the cap.

• Proceed with the test as explained for high range

measurements.

• To obtain the results for both methyl orange and

phenolphthalein acidity, multiply the read off the sy-

ringe by 100.

The chemicals contained in this test kit may be hazardous if

improperly handled. Read Health and Safety Data Sheets

before performing the test.

x 500 = mg/L CaCO

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