Bluelab Soil pH Pen - Manual (Page 10)

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English
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8.0 Measuring the pH value of a soil solution
The greatest source of error in soil analysis comes during sample
collection. An effort should be made to ensure each sample properly
represents the area being sampled.
Collection of sample
Sample in a zig-zag pattern across the required area.
Take samples of soil at approximately 20 cm / 8” deep.
Mix all collected samples together thoroughly.
Ideally, allow to dry in the air or in an oven at 40 °C / 104 °F.
Weigh out 20 g / 0.7 oz of the collected soil into a 150 ml / 5 fl oz plastic sample jar.
Sample preparation
Add 100 ml / 3 fl oz of distilled or deionized water, screw lid on tightly.
Shake continuously for 5 minutes. Leave overnight and shake again the next morning.
Allow to settle for 15 minutes after shaking and strain sample into clean measuring cup.
Take pH readings as follows:
Remove the storage cap/dibber and insert the probe tip into the soil solution sample.
Turn the Soil pH Pen on.
Wait for the reading displayed to stabilize to a constant value. Record the reading.
If the Soil pH Pen turns off while taking a measurement, simply press the power
button to turn the Soil pH Pen back on and continue with your measurement.
Remove the probe from the soil solution and rinse the probe tip under fresh running
water (not RO or distilled) to remove soil residue.
Place the storage cap/dibber back onto the probe after use, ensuring it contains
Bluelab pH Probe Storage Solution or plenty of tap water.
“IF IT DRIES - IT DIES!”. See section 4.0 - Soil pH Probe Care.
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