FINAL REPORT
FINAL REPORT
FINAL REPORT
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10.3 Soil Conditions (M. Walther)<br />
Methods of chemical analysis<br />
Preparation of water extract of soil samples<br />
Methodology<br />
When soil is extracted by water, main ions move to the liquid phase.<br />
Materials<br />
• Conic flasks<br />
• Water<br />
Experimental procedure<br />
Weigh 20g of soil sample. Add 100ml noncarbonized water. After 1 hour, filtrate it.<br />
1. Determination pH values<br />
Methodology<br />
pH of soil is measured in the water extract. Could be used of various pH –meters.<br />
Materials<br />
• 100ml beaker<br />
• R–340 pH meter<br />
Experimental procedure<br />
Measure 10 ml of water extract. Constract instruments electrode about 2 minutes in it. When<br />
the instrument had measured a constant value of pH, stop the measuring process and write the<br />
pHvalue.<br />
2. Determination of soil moisture<br />
Methodology<br />
Over 105 0 C, all water in soil goes to vapour. The difference of mass of the non –<br />
heated and heated soil is give the chance to measure soil moisture.<br />
Materials<br />
• Weighing glass<br />
• Thermostate<br />
• Analytical balance<br />
Experimental procedure<br />
Weigh weighing bottle by analytical balance. Add about 5g soil and weigh again. Then keep it<br />
in thermostat over 105 0 C, for 2 hours. Then weigh it again, it must have lost its water. Repeat<br />
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