33
Metalyser
®
Soils HM4000
Instruction Manual v3.0
4.5 DIGESTION PROCEDURE FOR WET SOILS (PRECISE)
1.
Take an excess amount of wet/moist soil sample using the scoop
provided.
2.
Remove any big pieces of stone or wood out of your soil sample.
3.
Use the pestle and mortar to mix up the soil until a uniform wet
soil sample is obtained.
4.
Transfer an excess amount the wet or moist (ca. 10-20g) soil in a
small oven dish and leave it in an oven at temperature of 100°c
for 1 hour.
5.
After 1 hour, take the dry soil sample out and let it cool down for
10 - 15 minutes.
6.
Place the empty digestion beaker on the balance provided and
press Tare or Zero on the balance, and wait until it displays
“0.00
g”.
7.
Use the spatula to gently add the dried soil into the digestion
beaker, until it shows the weight of “1.00 g” of the soil sample.
8.
Add approx. 30mL of de-ionised water to the graduated beaker.
9.
Add D1, D2 and D3 to the graduated beaker and then fill up with
de-ionised water to the 50ml mark.
10.
Pour the full contents of the graduated beaker into the digestion
beaker and swirl to mix.
11.
Decant from beaker to beaker to ensure full transfer of soil
12.
Connect the digestion beaker to the mixer.
13.
Choose the “Digest” method from the list of methods in the
Metalyser
®
, select ‘Condition’ and let it stir for 10 minutes.
14.
After 10 mins, remove the beaker from the stirrer head and let it
settle for 5 minutes.
