Hanna Instruments HI 38079 - Manual

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 [email protected].
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;
HI 38079
Magnesium
Test Kit for
Irrigation Water
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.
25 mL
10 mL