Measuring CO2 Production Using Soda Lime:

Soil Moisture Content Data Form

 

For use with Protocol 8b: Determining Moisture Content

Complete one form for each soil sample.

 

Name(s) _____________________________ Date _______________

 

Soil sample ID number ____________________________________________

 

Soil sampling location _____________________________________________

 

Type of area sampled (e.g., forest, schoolyard) _________________________

 

Date soil sample was collected _____________________________________

 

Describe the soil sample (e.g., number and size of rocks and roots in sample; did the soil appear to be very wet or very dry?)

 

 

Was the soil sample well mixed? ______________________

 

Date and time soil subsample placed in drying oven ______________________

 

Date and time soil subsample removed from drying oven ______________________

 

or, time and power level required to dry subsample in microwave ______________

 

Protocol 8b, Part 1: Determine percent moisture, using a subsample.

 

Step 2: Weight of beaker = _____________ g.

 

Step 3:

 

wet wt of soil

=

combined wt

of beaker and soil

wt of beaker

=

____________ g

____________ g

=

____________ g

 

 

Step 5:

 

dry wt of subsample

=

combined wt

of beaker and soil after drying

wt of beaker

=

____________ g

____________ g

=

____________ g

 

 

Step 6:

 

moisture content =

wet wt - dry wt

wet wt

=

 

_____g - ____g

_____g

 

moisture content =

___________

 

This result is expressed in decimal form for use in dry weight and CO2 calculations. To express as a percentage instead, simply multiply by 100.

 

Part 2: Adjust total sample to 50% moisture, if needed.

 

Step 1: Total soil weight = ______________ g

 

Step 2:

 

actual water wt of full sample

=

total soil wt of full sample

x

moisture content of subsample

 

=

__________ g

x

__________

 

=

__________ g

 

 

Step 3:

 

dry wt of full sample

=

total soil wt of full sample

actual water wt of full sample

 

=

_________ g

_________ g

 

=

_________ g

 

 

 

Step 4:

 

wt of water to be added

=

desired water wt

actual water wt

 

=

______ g

______ g

 

=

______ g