Hanna Instruments HI 38084 - 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 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:
• Potassium Chloride, 1 box (380 g);
• Phenolphthalein Indicator, 1 bottle with dropper (20 mL);
• HI 38084C-0 Titration 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 2-mm soil sieve;
• 1 large funnel;
• filter paper discs
∅ 120 mm (100 pcs);
• 1 plastic test tube (50 mL) with screw cap;
• 1 calibrated plastic vessel (50 mL);
• 2 sample cups (2 g);
• 1 sample cup (1 g);
ISTR38084 02/00 PRINTED IN ITALY
INSTRUCTIONS SAMPLING PROCEDURE
SIGNIFICANCE AND USE
The total exchangeable acidity (TEA) is a measure of the
amount of acidic cations (hydrogen, aluminum, iron and
manganese) present in soil. It is expressed in milliequivalent
per 100 grams (meq/100 g) of soil. The more acidic it is a
soil, the lower the soil pH value will be. Soils in humid
regions normally accumulate increasing amounts of ex-
changeable acidity as they get older. Soil acidity may
develop toxicity that can damage or kill plants.
READ THE ENTIRE INSTRUCTIONS BEFORE USING THE KIT
• Remove the cap
and fill the Dem-
ineralizer Bottle
with tap water.
• Replace the cap
and shake gen-
tly for at least
2 minutes. The
demineralized
water is now
ready.
• Flip open the top of the Deminer-
alizer Bottle cap. By gently
squeezing the bottle, add dem-
ineralized water to the large (50
mL) test tube up to the 50 mL
mark.
• Add 2 measures of the large (2 g) sample cup of
Potassium Chloride (add full cups and discard the excess
soil by using the spoon handle).
• Place the cap on the
tube and shake it sev-
eral times until the
reagent has completely
dissolved. The potassium
chloride extractant so-
lution is now ready.
• Place the funnel on the top of
the beaker.
• 1 plastic pipette (1 mL);
• 1 brush;
• 1 spoon.
Note: Any damaged or defective item must be returned in
its original packing materials.
WHEN TO TEST YOUR SOIL
Soil should be tested not only when the plant appears to
be unhealthy (yellow leaves or stunted growth), but prior to
seeding, planting and fertilizing as well as when other
material such as manure or compost has been added.
SAMPLING
1) Soil Sample Extraction
– Within a large homogeneous area, take 1 or 2 samples
per 1000 m 2 (0.25 acre).
– Even for smaller areas, 2 samples are recommended
(the more samples, the better the end-results, be-
cause the end sample is more representative).
– For a small garden or plot, 1 sample is sufficient.
2) Avoid extracting samples from soil presenting obvious
anomalies and from border areas (near ditches and roads).
3) Sample quantity:
Take the same quantity of soil for each sample. For ex-
ample, use bags with similar dimensions (1 bag per
sample).
4) Depth of extraction:
General: dig and discard 5 cm (2") of topsoil
For lawns: take the sample at a depth of 5 to 15 cm (from
2" to 6").
For other plants (flowers, vegetables, shrubs): from 20 to
40 cm of depth (8" to 16").
For trees: Samples from 20 to 60 cm of depth (8" to 24'’).
5) Mix all the samples together to obtain a homogeneous
mixture of soil, discarding stones and vegetable residues.
6) From this mixture, take the quantity of soil that you
need for the analysis.
7) Crumble the large chunks and distribute the soil sample
on paper or plastic to air dry it.
8) Use a small bar to crush the air dried sample and pass it
through the 2-mm soil sieve.
CHEMICAL REACTION
The extraction method is the potassium chloride method.
The acidic cations are firstly leached from the soil and then
titrated with a standard alkali. The reaction endpoint is
visually indicated by a color change (from colorless to pink)
of the indicator reagent.
x 2
Range 0 to 2.5 meq/100 g
Smallest Increment 0.1 meq/100 g
Analysis Method Titration
Sample Size 5 g of soil
Number of Tests 100
Case Dimensions 235x175x115 mm (9.2x6.9x4.5")
Shipping Weight 1027 g (36.2 oz.)
Note: TEA is Total Exchangeable Acidity; meq/100 g is
milliequivalent per 100 grams.
SPECIFICATIONS
50 mL
HI 38084
Total Exchangeable
Acidity Test Kit