Hanna Instruments hi 38079 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 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 damage, notify

your Dealer or the nearest Hanna office immediately.
Each kit is supplied with:

• Buffer Reagent, 1 bottle with dropper (25 mL);
• Oxalate Reagent, powder (100 pcs);
• HI 38079B-0 EDTA Solution, 1 bottle (120 mL);
• Buffer Solution pH 10.2±0.2, 1 bottle (100 mL);
• Calmagite Indicator, 1 bottle with dropper (10 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 plastic vessel (20 mL);
• 2 calibrated plastic vessels (50 mL);
• 1 large funnel;
• filter paper discs 

∅

 110 mm (100 pcs);

• 1 plastic spoon;

ISTR38079      09/00     PRINTED IN ITALY

Magnesium is a common constituent of natural waters; its

average abundance in streams is 4 mg/L and in groundwaters

is >5 mg/L. In concentration greater than 125 mg/L it

can cause diuretic effect. The aqueous species is often Mg

2+

and it does not normally result in precipitation (as dolomite)

in natural waters. Magnesium is also an important con-

tributor to the hardness of water: when heated, magnesium

salts break down forming incrustation in boilers. Moreover

magnesium is necessary to plant metabolism since it is an

essential constituent of organic molecules such as chlorophyll.
By using the HI 38079 Hanna Test Kit, it is possible to

differentiate between calcium and magnesium, since the kit

determines only the magnesium ions.
Note:     mg/L is equivalent to ppm (parts per million).

SPECIFICATIONS

SPECIFICATIONS

SPECIFICATIONS

SPECIFICATIONS

SPECIFICATIONS

SIGNIFICANCE AND USE

SIGNIFICANCE AND USE

SIGNIFICANCE AND USE

SIGNIFICANCE AND USE

SIGNIFICANCE AND USE

CHEMICAL REACTION

CHEMICAL REACTION

CHEMICAL REACTION

CHEMICAL REACTION

CHEMICAL REACTION

INSTRUCTIONS

INSTRUCTIONS

INSTRUCTIONS

INSTRUCTIONS

INSTRUCTIONS

The Hanna Test Kit determines Magnesium in irrigation

water via a titrimetric method. Calcium, if present, is

removed by prior filtration. Then the indicator chelates with

magnesium to form a red colored complex. As EDTA is

added, magnesium complexes with it: the reaction endpoint

is indicated by a change in color of the indicator from red to

blue.

READ THE ENTIRE INSTRUCTIONS BEFORE USING THE KIT

1- Remove the cap and fill

the Demineralizer Bottle

with tap water.

2- Replace the cap

and shake for at

least 2 minutes.

The demineralized

water is now

ready.

3- Fill one of the large (50 mL)

plastic vessels with 25 mL of wa-

ter sample, up to the mark.

4- Add 4 drops of Buffer Reagent and swirl to mix.

5- Add 1 packet of HI 38079A-0 Oxalate reagent and mix

for 30 seconds by means of the plastic spoon. Some

deposits may remain, but they do not affect the mea-

surement.

6- Wait for about 5 minutes for the

reaction to complete. If Calcium is

present, the solution will become tur-

bid.

Range

0 to 240 mg/L (ppm) as Mg (MR)

0 to 725 mg/L (ppm) as Mg (HR)

Smallest Increment

±2.4 mg/L as Mg (MR)

±7.3 mg/L as Mg (HR)

Analysis Method

Titration

Sample Size

25 mL

Number of Tests

100 (average)

Case Dimensions

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

Shipping Weight

873 g (30.8 oz.)

7- Fold a filter paper disc twice as shown in the figure.

8- Separate one side from the other

three to form a cone.

9- Place the folded filter disc in the

funnel. Place the funnel over the

other large plastic vessel.

10- Pour the reacted wa-

ter sample through

the filter paper.

11- Using the 3 mL plastic pipette, carefully

transfer 3 mL of the filtered clear water

sample into the small (20 mL) plastic

vessel.

12- Flip open the top of the Dem-

ineralizer Bottle cap. By gently

squeezing the bottle, add dem-

ineralized water to the vessel

up to the 10 mL mark.

13- Using the 1 mL plastic pipette, add 1 mL of Buffer

Solution 10.2±0.2 and swirl to mix.

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

Note: Any damaged or defective item must be returned in

its original packing materials.