Hanna Instruments HI 38082 User Manual
Instruction Manual
HI 38082
Potassium
Test Kit for
Soil
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 damage, notify your Dealer or the nearest Hanna office
immediately.
Each kit is supplied with:
Formaldehyde Solution, 4 bottles with dropper (4 x 25 mL);
•
HI 38082A-0 Alkaline Solution, 3 bottles (3 x 100 mL);
•
• HI 38082B-0 Potassium Reagent, packets (100 pcs);
• 1 long glass test tube (50 mL);
•1 calibrated plastic vessel (50 mL);
•1 long plastic pipette (1 mL);
• 1 plastic pipette (3 mL);
•1 syringe (1 mL) with tip;
• 1 spoon;
1 graduated card;
•
• 1 point card.
Note: Any damaged or defective item must be returned in
its original packing materials.
SPECIFICATIONSSPECIFICATIONS
SPECIFICATIONS
SPECIFICATIONSSPECIFICATIONS
Range 0 to 50 mg/L (ppm) as K
50 to 250 mg/L (ppm) as K
Smallest Increment 5 mg/L [in the 0-50 mg/L range]
25 mg/L [in the 50-250 mg/L range]
Analysis Method Turbidimetric
Sample Size 3 mL and 0.6 mL
Number of Tests 100
Case Dimensions 235x175x115 mm (9.2x6.9x4.5")
Shipping Weight 889.0 g (31.3 oz.)
SIGNIFICANCE AND USESIGNIFICANCE AND USE
SIGNIFICANCE AND USE
SIGNIFICANCE AND USESIGNIFICANCE AND USE
Potassium is present in tissues responsible for the growth of
plants (primary and secondary meristems). It plays an
important role in how much water is absorbed by the roots
and in the regulation of cellular activity. In addition,
potassium makes plants more resistant to diseases and
yields a positive effect on the color and fragrance in flowers.
The problem of lack of potassium is quite frequent in
calcareous soils.
Note: mg/L is equivalent to ppm (parts per million).
CHEMICAL REACTIONCHEMICAL REACTION
CHEMICAL REACTION
CHEMICAL REACTIONCHEMICAL REACTION
The Hanna Test Kit determines Potassium in soil via a
turbidimetric method. Potassium is precipitated in a basic
environment with sodium tetraphenylborate. The developed
turbidity is proportional to potassium concentration.
INSTRUCTIONSINSTRUCTIONS
INSTRUCTIONS
INSTRUCTIONSINSTRUCTIONS
READ THE ENTIRE INSTRUCTIONS BEFORE USING THE KIT
1- Obtain a Mehlich extract
from the soil sample by
performing the Mehlich
extraction.
2- Using the syringe, add
3 mL of soil extract to
the plastic vessel (a full
syringe contains 1 mL of
ISTR38082 10/00 PRINTED IN ITALY
solution, hence repeat 3
3 mL
times). Add deionized water up
to the 25 mL mark.
3- Add 18 drops of Formaldehyde
Solution and swirl to mix.
x18
4- Using the short plastic pipette, add 3 mL of HI 38082A-0
Alkaline Solution and swirl to mix.
3 mL
5- Add 1 packet of HI 38082B-0
reagent and mix by means of
the spoon.
6- Wait for 5 min-
utes to allow
reaction to complete. If Potassium is present,
the solution will become turbid.
7- Place the test tube on the
Point card and look from the
top of the tube at the black
spot on the Point card. Use
the long pipette to fill the
tube with the reacted sample
until the black spot completely
disappears.
25 mL
8- Hold the tube close to the Graduated
card as shown in the figure.
9- Read directly from the Graduated card
the concentration in mg/L (ppm) of potassium that corresponds to the level of
the liquid in the test tube.
10-In case the black spot on the Point
card disappears when the liquid
level is under the 50 ppm mark,
the potassium concentration is
higher than 50 ppm. Dilute the
original sample and perform the
test as follows.
11 -Using the syringe, add to the plastic
vessel 0.6 mL of soil extract.
Note: To measure exactly 0.6 mL, take
the syringe and push the plunger
completely down into the syringe.
Insert tip into the extract and
pull the plunger out until the
lower edge of the seal is on the
0.0 mL mark of the syringe.
Insert the syringe into the vessel
and push the sample out until
the lower edge of the seal is on
the 0.6 mL mark.
0.6 mL
12- Add demineralized water up to
the 25 mL mark.
13-Follow the instructions from step
3 to step 8.
14- Read from the Graduated card the value corresponding
to the level of the liquid in the test tube and multiply
it by 5 to obtain the concentration in mg/L (ppm) of
potassium.
15- Rinse all labware with demineralized water after each
analysis and shake dry.
POTASSIUM CONVERSION TABLE
mg/L lbs/A Kg/A meq/100g
10 20 22 0.026
15 30 33 0.038
20 40 45 0.051
25 50 56 0.064
30 60 67 0.076
35 70 78 0.090
40 80 89 0.100
45 90 100 0.120
50 100 112 0.130
75 150 167 0.190
100 200 223 0.260
125 250 279 0.320
150 300 334 0.380
175 350 390 0.450
200 400 446 0.510
225 450 502 0.580
250 500 558 0.640
Note: meq/100 g is milliequivalent per 100 grams.
REFERENCESREFERENCES
REFERENCES
REFERENCESREFERENCES
Adaptation of the Turbidimetric Tetraphenylborate Method.
HEALTH AND SAFETYHEALTH AND SAFETY
HEALTH AND SAFETY
HEALTH AND SAFETYHEALTH AND SAFETY
The chemicals contained in this kit may be hazardous if
improperly handled. Read the relevant Health and Safety
Data Sheet before performing this test.
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