Hanna Instruments hi 38034 User Manual

HI 38034

Total Hardness

0-20 gpg range

0-20 ppm range

Test Kit

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.

Instruction Manual

ISTR38034 09/00 PRINTED IN ITALY

Water hardness has traditionally been defined as the

capacity of water to precipitate soap. The ionic species in
water causing the precipitation were later found to be
primarily calcium and magnesium. At the present time,
water hardness is a quantitative measure of these ions in
the water sample. Now it is also known that certain other
ion species, such as iron, zinc and manganese, contribute to
the overall hardness of water. The measure and subsequent

control of water hardness is essential to prevent scaling and
clogging in water pipes. The Hanna hardness test kit makes
monitoring easy and quick. The compact size provides the
versatility to use the kit anywhere and the design makes
the kit easy to handle.
Note: 1 gpg (grains per gallon) CaCO

is equivalent to 17

ppm CaCO

(where

ppm - parts per million - is

equivalent to mg/L).

Range

0 to 20 gpg CaCO

0 to 20 ppm CaCO

Smallest Increment

0.2 gpg CaCO

0.2 ppm CaCO

Analysis Method

EDTA titration

Sample Size

25 mL

Number of Tests

100 for the gpg range

100 for the ppm range

Case Dimensions

235x175x115 mm (9.2x6.9x4.5")

Shipping Weight

567 g (20.0 oz.)

SPECIFICATIONS

SIGNIFICANCE AND USE

CHEMICAL REACTION

The hardness level is determined by an EDTA (ethylene-

diamine-tetraacetic acid) titration. The solution is first adjusted
to a pH of 10 using a buffer solution. The indicator chelates
with metal ions such as magnesium or calcium to form a red
colored complex. As EDTA is added, metal ions complex with it.
After all the free metal ions have been complexed, an excess
EDTA removes the metal ions complexed with the indicator to

form a blue colored solution. This color change from red to
blue is the endpoint of the titration.

READ ALL THE INSTRUCTIONS BEFORE USING THE TEST KIT
• Remove the cap from the plastic

vessel. Rinse the plastic vessel with
the water sample, fill to the 25 mL

mark and replace the cap.

• Add 5 drops of Buffer Solution through the cap port

and mix carefully by swirling the vessel in tight circles.

• Add 1 drop of Calmagite Indicator through the cap port

and mix as described above. The solution becomes a red-
violet color.

• Take the syringe and push the

plunger completely down into the
syringe. Insert tip into the EDTA
solution gpg range (or EDTA so-
lution ppm range) and pull the
plunger out until the lower edge

of the seal is on the 0.0 mL
mark of the syringe.

• Place the syringe tip

into the cap port of
the plastic vessel and
slowly add the titra-
tion solution drop by
drop, swirling after
each drop.

• Continue adding the

INSTRUCTIONS

REFERENCES

Standard Methods for the Examination of Water and
Wastewater

, 16

Edition, 1985, p. 210-214.

1987 Annual Book of ASTM Standard

, vol. 11.01 Water

(1), p. 212-215.

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:

• Buffer Solution pH 10.2±0.2, 2 bottles with drop-

per (2x30 mL);

• Calmagite Indicator, 1 bottle with dropper (10 mL);
• EDTA Solution 0-20 gpg range, 1 bottle (100 mL);
• EDTA Solution 0-20 ppm range, 1 bottle (100 mL);
• 1 calibrated plastic vessel (50 mL) with cap;
• 2 syringes (1 mL) with tips.

Note: Any damaged or defective item must be returned in

its original packing materials.

25 mL

x 5

x 1

www.hannainst.com

EDTA Solution until the solution in the vessel becomes

purple. Then mix for 15 seconds after each additional
drop until the solution in the vessel turns blue.

• Read off the milliliters of titration solution used from the

syringe and multiply by 20 to obtain the hardness level
of your sample as gpg (or as ppm) CaCO

If it has been used EDTA Solution 0-20 gpg range:

mL of titrant x 20 = gpg CaCO

If it has been used EDTA Solution 0-20 ppm range:

mL of titrant x 20 = ppm CaCO