This will be my template for this round of soil sample processing.
A few notes:
- We forgot to pack the scale, so ours is being sent. In the meantime, I've borrowed one (generously loaned by John H) with a resolution of 1g. When our scale arrives, I'll make a few parallel measurements to compare the two scales.
- We couldn't find any good foil cups at the store today to bake the dirt in, so I've made some by bending aluminum foil. Obviously, they won't tare as consistently as store-bought.
- The coring tool was set up with two 3cm rings on the top (used) followed by two 1cm rings on the bottom (ignored). Thus, each 3cm sample volume was 3*pi*(5.31/2)^2=66.4cm^3.
Site/Time |
Depth |
ID |
Tare(g) |
Wet(g) |
Dry(g) |
Rho-dry (g/cm^3) |
Qsoil (% mass) |
Volume fraction (%) |
Comments |
|---|---|---|---|---|---|---|---|---|---|
|
|
|
|
|
|
|
(wet-dry)/wet |
(wet-dry)*rho_water/vol |
|
1 |
0-3 |
2-0 |
3.5 |
73 |
47.9 |
0.67 |
36 |
37 |
|
5Jan 0950 |
3-6 |
2-6 |
3.7 |
123 |
101.9 |
1.48 |
18 |
32 |
|
2 |
0-3 |
3-0 |
3.3 |
90 |
74 |
1.06 |
18 |
24 |
Soil damp&sticky |
4Jan1410 |
3-6 |
3-6 |
3.6 |
129 |
121 |
1.77 |
6 |
12 |
Piece of brick |
3 |
0-2.5 |
1-0 |
3.4 |
89# |
68 |
1.17 |
25 |
38 |
Only ~2.5cm thick |
3Jan1500 |
2.5-5.5 |
1-6 |
3.4 |
148# |
124 |
1.82 |
17 |
36 |
|
4 |
0-3 |
2-0 |
3.5 |
152# |
122 |
1.78 |
20 |
45 |
|
3Jan1636 |
3-6 |
2-6 |
3.7 |
137# |
115 |
1.68 |
17 |
33 |
|
5 |
0-3 |
1-0 |
3.4 |
103 |
87.2 |
1.26 |
16 |
24 |
|
5Jan 1445 |
3-6 |
1-6 |
3.4 |
99 |
89.9 |
1.30 |
10 |
14 |
|
6 |
0-4 |
1-0 |
3.4 |
97.4* |
61.4 |
0.66 |
38 |
41 |
Soil was frozen, |
6Jan 1012 |
4-6 |
1-6 |
3.4 |
72.2 |
58.0 |
1.23 |
21 |
32 |
so odd depths (approx) |
7 |
0-3 |
2-0 |
3.5 |
40.9* |
23.75 |
0.30 |
46 |
26 |
|
6Jan 1140 |
3-6 |
2-6 |
3.7 |
77.4 |
59.4 |
0.84 |
24 |
27 |
|
# = weighed wet a day later (but kept cold to reduce water loss)
* = weight after a bit of time in the oven :( [forgot to write down first reading], water content will be a bit low, but dry density will be okay
Here is a quick comparison of the weights of various objects with the borrowed scale and ours. The borrowed scale read within 1g, so I wouldn't change any of the above readings.
Ours (g) |
Borrowed (g) |
|---|---|
3.6 |
3 |
3.3 |
3 |
48.5 |
49 |
85.1 |
85 |
116.3 |
117 |
145.2 |
146 |
ROUND TWO:
Warmer temperatures have both melted snow (and there has been rain) to increase moisture and liquified existing moisture to allow the EC-5s to measure it.
Site/Time |
Depth |
ID |
Tare (g) |
Wet (g) |
Dry (g) |
Rho-dry |
Qsoil |
Volume Fraction |
Comments |
|---|---|---|---|---|---|---|---|---|---|
|
|
|
|
|
|
|
|
|
|
1 |
0-3 |
1-0 |
3.4 |
135.6 |
107.3 |
1.57 |
21 |
43 |
|
17 Jan 0835 |
3-6 |
1-6 |
3.5 |
163.3 |
138.4 |
2.03 |
16 |
37 |
May have been compressed |
2 |
0-3 |
4-0 |
3.6 |
92.0 |
73.3 |
1.05 |
21 |
28 |
a bit frozen |
18 Jan 0828 |
3-6 |
4-6 |
3.8 |
96.3 |
86.8 |
1.25 |
10 |
14 |
|
3 |
0-3 |
2-0 |
3.6 |
69.5 |
38.5 |
0.53 |
47 |
47 |
grass |
17 Jan 1010 |
3-6 |
2-6 |
3.7 |
138.3 |
111.1 |
1.62 |
20 |
41 |
|
4 |
0-3 |
1-0 |
3.5 |
131.1 |
108.9 |
1.59 |
17 |
33 |
|
19 Jan 1140 |
3-6 |
1-6 |
3.5 |
132.1 |
111.3 |
1.62 |
16 |
31 |
|
5 main |
0-3 |
3-0 |
3.3 |
113.1 |
82.8 |
1.20 |
28 |
46 |
water (frozen) |
17 Jan 1120 |
3-6 |
3-6 |
3.6 |
112.1 |
89.5 |
1.29 |
21 |
34 |
|
5 aux |
0-3 |
4-0 |
3.6 |
124.8 |
105.2 |
1.53 |
16 |
30 |
|
17 Jan 1132 |
3-6 |
4-6 |
3.8 |
120.1 |
104.8 |
1.52 |
13 |
23 |
|
6 |
0-3 |
5-0 |
3.8 |
110.2 |
86.8 |
1.25 |
21 |
35 |
|
19 Jan 1420 |
3-6 |
5-6 |
3.4 |
131.7 |
112.0 |
1.63 |
15 |
30 |
|
6 aux |
0-3 |
3-0 |
3.4 |
139.5 |
113.5 |
1.66 |
19 |
39 |
|
19 Jan 1425 |
3-6 |
3-6 |
3.6 |
129.0 |
104.6 |
1.52 |
19 |
37 |
|
7 |
0-3 |
5-0 |
3.8 |
90.9 |
48.7 |
0.68 |
48 |
64 |
water (frozen) |
17 Jan 1221 |
3-6 |
5-6 |
3.4 |
112.4 |
82.6 |
1.19 |
27 |
45 |
water |
ROUND THREE:
John, Tom, and Steve S
We tared the scale prior to weighing the wet soil (net), weighed the dry soil + pan (total), then subtracted the pan wt to get the dry soil (net).
I mistakenly started weighing the soil in ounces, so we continued this in order to make a consistent table.
Ring diameter = 2 3/32" = 2.094" = 5.319 cm; volume = 66.66 cm^3; 1 oz = 28.35 gm
Qsoil = 1 - dry/wet; h2o volume fraction = (wet-dry)/(1 gm per cm^3)/sample-volume
Site |
Time |
Depth |
Tray ID |
Tare |
Wet Wt |
Dry Wt |
Dry Wt |
rho-dry |
Qsoil |
h2o vol fraction |
|---|---|---|---|---|---|---|---|---|---|---|
1 |
Jan 30 10:45 |
0-3 |
4-0 |
0.130 |
2.845 |
1.575 |
1.445 |
0.615 |
47 |
54 |
|
|
3-6 |
4-6 |
0.135 |
4.700 |
3.900 |
3.765 |
1.601 |
18 |
34 |
2 |
Jan 29 14:30 |
0-3 |
4-0 |
0.130 |
3.825 |
3.440 |
3.310 |
1.408 |
10 |
16 |
|
|
3-6 |
4-6 |
0.135 |
4.400 |
4.185 |
4.050 |
1.722 |
5 |
9 |
3 |
Jan 28 14:30 |
0-3 |
3-0 |
0.120 |
3.195 |
3.120 |
3.000 |
1.276 |
2 |
3 |
|
|
3-6 |
3-6 |
0.125 |
4.810 |
4.100 |
3.975 |
1.691 |
15 |
30 |
4 |
Jan 28 11:15 |
0-3 |
2-0 |
0.120 |
2.365 |
2.045 |
1.925 |
0.819 |
14 |
14 |
|
|
3-6 |
2-6 |
0.130 |
4.875 |
4.335 |
4.205 |
1.788 |
11 |
23 |
5 main |
Jan 27 14:31 |
0-3 |
4-0 |
0.130 |
3.060 |
2.525 |
2.395 |
1.019 |
18 |
23 |
|
|
3-6 |
4-6 |
0.135 |
3.790 |
3.395 |
3.260 |
1.386 |
11 |
17 |
5 aux |
Jan 27 14:55 |
0-3 |
5-0 |
0.140 |
3.625 |
3.130 |
2.990 |
1.272 |
14 |
21 |
|
|
3-6 |
5-6 |
0.120 |
2.495 |
2.390 |
2.270 |
0.965 |
4 |
4 |
6 main |
Jan 24 11:45 |
0-3 |
4-0 |
0.135 |
4.415 |
3.305 |
3.170 |
1.348 |
26 |
47 |
|
|
3-6 |
4-6 |
0.125 |
5.705 |
4.890 |
4.765 |
2.027 |
15 |
35 |
6 aux |
Jan 24 12:15 |
0-3 |
2-0 |
0.135 |
3.420 |
2.715 |
2.580 |
1.097 |
21 |
30 |
|
|
3-6 |
2-6 |
0.130 |
4.775 |
4.094 |
3.964 |
1.686 |
15 |
29 |
7 |
Jan 27 16:18 |
0-3 |
1-0 |
0.125 |
3.115 |
2.200 |
2.075 |
0.882 |
31 |
39 |
|
|
3-6 |
1-6 |
0.125 |
3.635 |
2.785 |
2.660 |
1.131 |
24 |
36 |
P.S. (18 Apr 2011): All calculations seemed off in Round 3, reran and edited above entries.