| Method used |
Concentration (ppm) |
SPE Efficiency |
% Recovery |
Average Recovery (%) |
% a.i. in formulation |
Average a.i. in formulation |
| Standard pure compound |
2 |
98.66 ± 0.03 |
- |
- |
- |
- |
| 1 |
98.30 ± 0.2 |
| 0.5 |
98.02 ± 0.09 |
| Ethyl acetate* |
2 |
- |
86.37 ± 2.13 |
80.04 |
9.67 ± 1.43 |
9.353 ± 1.43 |
| 1 |
79.24 ± 4.33 |
9.36 ± 1.05 |
| 0.5 |
74.53 ± 4.56 |
9.03 ± 0.91 |
| Methanol# |
2 |
- |
96.98 ± 0.21 |
94.03 |
10.01 ± 0.03 |
9.966 ± 0.072 |
| 1 |
94.10 ± 0.01 |
9.98 ± 0.15 |
| 0.5 |
91.00 ± 0.12 |
9.83 ± 0.19 |
| Water# |
2 |
- |
96.56 ± 0.34 |
93.05 |
9.95 ± 0.2 |
9.883 ± 0.094 |
| 1 |
93.51 ± 0.30 |
9.87 ± 0.31 |
| 0.5 |
89.08 ± 0.46 |
9.82 ± 0.22 |
|
* Indirect method (LLE)
# Direct method (SPE) |
| Table 1: Recovery of clopyralid from standard and different methods |
