Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Accuracy results of sample extraction at different PETRA concentrations (n=3).
| Concentration added (%, m/m) | Concentration in blank (%, m/m) (mean±SD) | Concentration recovered (%, m/m) (mean±SD) | Mean recovery (%) | RSD (%) |
|---|---|---|---|---|
| 0 | 0.0019±0.0004 | |||
| 0.0075 | 0.0063±0.0001 | 91.14±1.38 | 1.51 | |
| 0.0015 | 0.0155±0.0004 | 92.49±2.37 | 2.56 | |
| 0.0298 | 0.0277±0.0008 | 92.96±2.67 | 2.88 | |
| Mean | 92.20 | 2.32 |
