Instruction Manual
HI 38074
Boron
Test Kit for
Irrigation Water
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,
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:
•
HI 38074A-0 Boron Reagent, 1 bottle with dropper
(30 mL);
•
HI 38074B-0 Boron Reagent, 1 bottle with dropper
(30 mL);
•
HI 38074C-0 Boron Reagent, 1 bottle (100 mL);
•
Mannitol, powder in packets (100 pcs);
•
HI 38074E-0 Boron Reagent, 1 bottle (100 mL);
• HI 70004, 1 sachet;
• HI 70007, 1 sachet;
•1Checker
, pocket-sized pH-meter;
• 1 screwdriver;
• 1 empty bottle (120 mL) with cap;
• 1 calibrated plastic vessel (50 mL);
• 2 plastic pipettes (1 mL).
Note: Any damaged or defective item must be returned in
its original packing materials.
ISTR38074 10/00 PRINTED IN ITALY
Boron is one of the micronutrients essential for plant growth. It
may be present naturally in water or may find its way into a
watercourse through industrial waste effluents. Boron in excess
of 2.0 mg/L in irrigation water is detrimental to many plants,
but some plants may even be affected adversely by concentra-
tions lower than 1.0 mg/L.
The US Department of Agriculture reports the following classifi-
cation:
ppm of Boron effect on crops
<0.5 good (except for very sensitive
crops)
0.5-2.0 some risks (many crops must
be excluded)
>2.0 dangerous (may only be used
for very tolerant crops)
Note: mg/L is equivalent to ppm (parts per million).
SPECIFICATIONSSPECIFICATIONS
SPECIFICATIONSSPECIFICATIONS
SPECIFICATIONS
SIGNIFICANCE AND USESIGNIFICANCE AND USE
SIGNIFICANCE AND USESIGNIFICANCE AND USE
SIGNIFICANCE AND USE
CHEMICAL REACTIONCHEMICAL REACTION
CHEMICAL REACTIONCHEMICAL REACTION
CHEMICAL REACTION
INSTRUCTIONSINSTRUCTIONS
INSTRUCTIONSINSTRUCTIONS
INSTRUCTIONS
The Hanna Test Kit allows the determination of boron
concentration in irrigation waters by direct titration of boric
acid.
READ THE ENTIRE INSTRUCTIONS BEFORE USING THE KIT
• Calibrate the pH electrode following the instructions in
the Checker
instrument manual.
Range 0 to 5 mg/L (ppm) as Boron
Smallest Increment 0.2 ppm Boron
Analysis Method Titration
Sample Size 50 mL
Number of Tests 100
Case Dimensions 235x175x115 mm (9.2x6.9x4.5")
Shipping Weight 780 g (27.5 oz.)
• Fill the plastic vessel with 50 mL of
sample (up to the mark).
• Add 3 drops of HI 38074A-0 Boron Reagent and swirl
to mix.
• Insert the Checker
pH electrode into the
vessel and measure the pH. The pH must be
lower than 7. If pH is higher than 7, add
HI 38074B-0 reagent drop by drop, swirl-
ing after each drop, until pH becomes lower
than 7.
• Using one of the plastic pipettes, add drops of HI 38074C-0
Boron Reagent, swirling after each drop.
• Keep on adding HI 38074C-0 reagent until the pH
reaches the 7.8±0.2 value. Write down the exact pH
value and report it as pH
start
(e.g.: pH
start
=7.85).
Note 1: If pH stabilizes at a value higher than 8, too
many drops of HI 38074C-0 reagent have been
added. In this case, add 1 drop of HI 38074B-0
reagent and swirl, then add again drops of
HI 38074C-0 to adjust the pH to 7.8±0.2.
Note 2: If carbonates are present, the pH readings will
show a drift after each addition. Wait until the pH
stabilizes before adding the next drop of HI 38074C-0
reagent.
• Add 1 packet of Mannitol reagent and swirl gently to
dissolve.
• Measure the pH:
- If pH is lower than pH
start
(e.g.: pH=7.52), use
the other plastic pipette to add HI 38074E-0 Boron
Reagent drop by drop, swirling after each drop, while
keeping an accurate count of the number of drops being
added to the solution. Keep adding the reagent until
pH becomes equal or higher than pH
start
(7.85). Use the
Boron Conversion Table below to convert the number of
drops added in mg/L (or ppm) of Boron (e.g.: 10 drops
of HI 38074E-0 reagent correspond to 2.0 mg/L of
Boron).
- If pH does not change after addition of the
powder packet, boron is absent. As a confirmation, add
one drop of HI 38074E-0 reagent and pH will immedi-
ately increase a lot.
x3
50 mL
BORON CONVERSION TABLE
number mg/L number mg/L
of drops Boron of drops Boron
1 0.2 14 2.8
2 0.4 15 3.0
3 0.6 16 3.2
4 0.8 17 3.4
5 1.0 18 3.6
6 1.2 19 3.8
7 1.4 20 4.0
8 1.6 21 4.2
9 1.8 22 4.4
10 2.0 23 4.6
11 2.2 24 4.8
12 2.4 25 5.0
13 2.6 26 5.2
(2 pages)
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