Hanna Instruments hi 38078 User 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:

• DiST 4 conductivity tester (with instructions and

screwdriver for calibration);

• HI 70039 calibration sachet 5000 µS/cm, 2 sachets;

• Buffer Solution pH 10.2±0.2, 1 bottle (100 mL);
• Calmagite Indicator, 1 bottle with dropper (10 mL);

• HI 38078-0 EDTA Solution, 1 bottle (120 mL);
• Demineralizer Bottle with filter cap for about 12 liters

of deionized water (depending on the hardness level

of water to be treated);

• 1 calibrated vessel (50 mL);
• 1 plastic pipette (3 mL);
• 1 plastic pipette (1 mL);
• 1 syringe (1 mL) with tip.

Note: Any damaged or defective item must be returned in

its original packing materials.

ISTR38078      02/00     PRINTED IN ITALY

Sodium is one of the most studied elements because of its

toxic effects both to soil texture and crops:

• High concentration of sodium disperses soil colloidal

particles, rendering the soil hard and resistant to

water penetration.

• The build-up of osmotic pressure in soil due to high

sodium concentration causes difficulty in water ab-

sorption by plant roots. Plants are sensitive to varying

degrees to soil salinity and when this exceeds a

certain limit their growth is impaired, thus lowering

their productivity.

High amounts of sodium can be mitigated by presence of

large quantities of calcium and magnesium in soil or with

distribution of gypsum (calcium sulfate) directly on soil or as

an additive to irrigation water.
The Hanna Test Kit determines Sodium Hazard in irrigation

water by calculation of SAR (Sodium Adsorption Ratio) in

relation to calcium and magnesium concentration.
Note: meq/L is milliequivalent per liter.

SPECIFICATIONS

SPECIFICATIONS

SPECIFICATIONS

SPECIFICATIONS

SPECIFICATIONS

SIGNIFICANCE AND USE

SIGNIFICANCE AND USE

SIGNIFICANCE AND USE

SIGNIFICANCE AND USE

SIGNIFICANCE AND USE

INSTRUCTIONS

INSTRUCTIONS

INSTRUCTIONS

INSTRUCTIONS

INSTRUCTIONS

Range

> 0 meq/L

Smallest Increment

0.5 meq/L for 1.0 mL sample
0.2 meq/L for 2.5 mL sample

Analysis Method

Titration

Sample Size

1.0 mL or 2.5 mL

Number of Tests

100 (average)

Case Dimensions

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

Shipping Weight

785 g (27.7 oz.)

READ THE ENTIRE INSTRUCTIONS BEFORE USING THE KIT

DETERMINATION OF CONDUCTIVITY

The concentration of total soluble salts dissolved in irrigation
water is measured as the capacity to conduct electricity (EC)
and is determined with a conductivity tester. Refer to the
enclosed instructions for a proper use of the DiST 4 Conduc-
tivity Tester.
Calculate the meq/L of soluble salts by multiplying the
conductivity mS/cm by 10.

meq/L Conductivity = mS/cm x 10

DETERMINATION OF CALCIUM AND MAGNESIUM

CHEMICAL REACTION
Calcium and Magnesium in irrigation water are determined

via a titrimetric method: the indicator chelates with the
Calcium and Magnesium ions to form a red colored complex.
As EDTA is added, calcium and magnesium complex with it:
the reaction end point is indicated by a change in color of
the indicator from red to blue.

INSTRUCTIONS
• Remove the cap and

fill the Demineralizer
Bottle with tap water.

• Replace the cap

and shake for at

least 2 minutes.
The demineralized
water is now
ready.

• Determine the conductivity of your sample using the

Hanna DiST 4 Conductivity Tester (for accurate results,
follow the DiST 4 instructions attentively):
- if the conductivity is < 2.00 mS/cm, take 2.5 mL of
water sample;
- if the conductivity is > 2.00 mS/cm, take 1.0 mL of
water sample.

• Use the 3 mL plastic pipette and transfer

2.5 mL or 1.0 mL of your sample (see
above) to the vessel.

• Flip open the top of the

Demineralizer Bottle cap.
Squeeze the bottle gently to

add demineralized water to
the vessel up to the 25 mL
mark.

• Using the syringe, add 1 mL of Buffer Solution and swirl

to mix.

• Add 1 drop of Calmagite Indicator and swirl to mix. If

calcium and magnesium are present, the solution will
turn wine red.

• Using the 1 mL plastic pipette, add drops of HI 38078-0

EDTA Solution. Swirl after each drop and keep an accurate

count of the number of drops being added to the solution.

• As the color changes from pink to purple, swirl for 15

seconds after each additional drop, until the solution
turns pure blue. Record the number of drops needed to
obtain the final color change (from wine red to pure
blue).

Note: high amounts of copper in your sample will alter the

final end point color. The solution will change from wine

red to purple without turning pure blue. In this case

add drops of titrant until no visible change in color is

obtained.