Hanna Instruments hi 38013 Benutzerhandbuch

SPECIFICATIONS

Instruction Manual

www.hannainst.com

Dear Customer,

Thank you for choosing a Hanna Product.
Please read the instruction sheet carefully before using the

test kit. It will provide you with the necessary information

for correct use of the kit. If you need additional information,

do not hesitate to e-mail us at tech@hannainst.com.
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:

• Phenolphthalein Indicator, 1 bottle with dropper (10 mL);

• Bromophenol Blue Indicator, 1 bottle with dropper (10 mL);
• HI 38013-0 Alkalinity Reagent, 2 bottles (2x105 mL);

• 1 calibrated plastic vessel (20 mL) with cap;

• 1 syringe (1 mL) with tip.

Note: Any damaged or defective item must be returned in

its original packing materials.

HI 38013

Phenolphthalein

and Total Alkalinity

Test Kit

ISTR38013 11/00 PRINTED IN ITALY

Alkalinity is the quantitative capacity of a water sample to

neutralize an acid to a set pH. This measurement is very

important in determining the corrosive characteristics of water

due primarily to hydroxide, carbonate and bicarbonate ions.

Other sources of alkalinity can be from anions that can be

hydrolyzed such as phosphate, silicate, borate, fluoride and

salts of some organic acids. Alkalinity is critical in the treat-

ments of drinking water, wastewater, boiler & cooling systems

and soils.
The Hanna Alkalinity Test Kit makes monitoring easy and

quick. The compact size gives the user the versatility to use

the kit anywhere. The design makes the kit easy to handle.
Note: 1 gpg (grain per gallon) CaCO

is equivalent to 17

ppm CaCO

(where

ppm - parts per million - is

equivalent to mg/L).

SIGNIFICANCE AND USE

CHEMICAL REACTION

Alkalinity can be measured as Phenolphthalein Alkalinity

and Total Alkalinity. The Phenolphthalein Alkalinity is de-

termined by neutralizing the sample to a pH of 8.3 using

a dilute sulfuric acid solution and a phenolphthalein indica-

tor. This process converts hydroxide ions to water, and

carbonate ions to bicarbonate ions:

2OH

–

→

O+SO

2–

2CO

2–

→

2HCO

–

+SO

2–

Since bicarbonate ions can be converted to carbonic acid with

additional sulfuric acid, the Phenolphthalein Alkalinity mea-

sures total hydroxide ions, but only half of the carbonate

contribution. To completely convert the carbonate ions, sulfuric

acid is added until the sample's pH is 4.5:

2HCO

–

→

+SO

2–

This is known as Total Alkalinity.

INSTRUCTIONS

READ ALL THE INSTRUCTIONS BEFORE USING THE TEST KIT
Determination of Phenolphthalein Alkalinity
• Remove the cap from the plastic

vessel. Rinse the plastic vessel with

water sample, fill to the 5 mL mark

and replace the cap.

• Add 1 drop of Phenolphthalein Indicator through the

cap port, and mix carefully by swirling the vessel in

tight circles. If the solution remains colorless, record the

phenolphthalein alkalinity as zero, and proceed with

the procedure for the determination of Total Alkalinity

(see below). If the solution is pink or red, proceed to the

next step.

• Take the syringe and push

the plunger completely down

into the syringe. Insert tip

into the HI 38013-0 Alka-

linity Reagent and pull the

plunger out until the lower

edge of the seal is on the

0.0 mL mark of the syringe.

• Place the sy-

ringe tip into

the cap port of

the plastic ves-

sel and slowly

add the titra-

tion solution

drop by drop,

swirling after

each drop.

• Continue adding titration solution until the solution in

the plastic vessel turns colorless.

• Read off the milliliters of titration solution from the

syringe and multiply by 20 to obtain gpg CaCO

Phenolphthalein Alkalinity of your sample.

mL of titrant x 20 = gpg CaCO

Determination of Total Alkalinity
• Remove the cap from the plastic

vessel. Rinse the plastic vessel with

water sample, fill to the 5 mL mark

and replace the cap.

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

Indicator and mix. If the solution is yellow, then it is

acidic and an acidity test must be carried out (see HI 3820 –

Hanna Acidity Test Kit). If the solution is green or blue,

then proceed to next step.

• Take the syringe and push

the plunger completely down

into the syringe. Insert tip

into the HI 38013-0 Alkalin-

ity Reagent and pull the

plunger out until the lower

edge of the seal is on the 0.0

mL mark of the syringe.

• Place the sy-

ringe tip into

the cap port of

the plastic ves-

sel and slowly

add the titra-

tion solution

drop by drop,

swirling after

each drop.

• Continue adding titration solution until the solution in

the plastic vessel turns yellow.

• Read off the milliliters of titration solution from the

syringe and multiply by 20 to obtain gpg CaCO

Total Alkalinity of your sample.

mL of titrant x 20 = gpg CaCO

Low Range Determinations
If results are lower than 10 gpg, the

precision of the test can be improved

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

with water sample, fill to the 10 mL mark and replace

the cap. Proceed with the test as described before. Read

off the milliliters of titration solution from the syringe

and multiply by 10 to obtain the result for both

Phenolphthalein and Total Alkalinity as gpg CaCO

mL of titrant x 10 = gpg CaCO

Range

0 to 10 gpg CaCO

0 to 20 gpg CaCO

Smallest Increment 0.1 gpg in the 0-10 gpg range

0.2 gpg in the 0-20 gpg range

Analysis Method

Acid titration using phenolphthalein

and bromophenol blue

Sample Size

5 mL and 10 mL

Number of Tests 100 total and 100 phenolphthalein
Case Dimensions

370x270x80 mm (14.6x10.6x3.1")

Shipping Weight

865 g (30.5 oz.)

SPECIFICATIONS

5 mL

x 1

REFERENCES

HEALTH AND SAFETY

The chemicals contained in this test kit may be hazardous if

improperly handled. Read the relevant Health and Safety

Data Sheets before performing the test.

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.

Standard Methods for the Examination of Water and
Wastewater

, 18

Edition, 1992, pages 445-446.

10 mL