Median DRP Concentrations
| a | a |
Solution:Soil Ratio |
||||
| a | a | 200 |
2000 |
|||
| Solution |
Minutes |
Media |
Range |
a |
Median |
Range |
| a |
a |
|
|
mg/L |
|
|
| RO |
5 |
0.045 |
0.110 |
a |
0.007 |
0.019 |
| 240 |
0.088 |
0.256 |
a |
0.019 |
0.060 |
|
| IRR |
5 |
0.035 |
0.077 |
a |
0.012 |
0.009 |
| 240 |
0.082 |
0.161 |
a |
0.013 |
0.022 |
|
| CaCl2 |
5 |
0.015 |
0.046 |
a |
0.002 |
0.014 |
| 240 |
0.028 |
0.121 |
a |
0.007 |
0.035 |
|
| a | a | a | a | a | a | a |
Table 2. Median DRP concentrations in the 0.2µm filtrates at two solution:soil ratios after a 5 or 240 minute equilibration time in three solutions. Also shown are the magnitude of the range for each of the respective data sets. DRP concentration at 5 minutes was approximately 50% of the 240 minute concentration for both solution:soil ratios and all three solutions. The mass of P released per unit weight of soil tended to increase as the dilution ratio increased in all three solutions (200 vs. 2000). There also appeared to be specific soil effects on the ratio by solution interaction (data not shown). Solution effects on DRP concentrations were similar to those shown in Figure 2 at both ratios. Concentrations in the CaCl2 solution at the 2000 ratio approached detection limits.