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 |
|
|