Determination of RhB in real samples.
| Sample | RhB added (μg L−1) | RhB found ± SD (μg L−1) | Recovery (%) | RSD (%) |
|---|---|---|---|---|
| RhB standard | 0 | 0.81 ± 0.01 | — | 1.3 |
| 1.00 | 1.83 ± 0.03 | 103.0 | 2.2 | |
| 2.00 | 2.92 ± 0.03 | 105.5 | 1.8 | |
| 3.00 | 3.77 ± 0.07 | 98.0 | 1.9 | |
| Lipstick | 0.00 | 0.22 ± 0.01 | — | 4.5 |
| 0.20 | 0.44 ± 0.02 | 110.0 | 5.1 | |
| 0.40 | 0.60 ± 0.02 | 95.0 | 3.8 | |
| 0.60 | 0.81 ± 0.03 | 98.3 | 4.1 | |
| Shampoo | 0.00 | 2.78 ± 0.09 | — | 3.3 |
| 2.00 | 4.79 ± 0.19 | 100.5 | 4.2 | |
| 3.00 | 5.84 ± 0.22 | 102.0 | 3.7 | |
| 5.00 | 7.92 ± 0.34 | 102.8 | 4.6 | |
| Red pencil core | 0.00 | 2.73 ± 0.07 | — | 2.5 |
| 2.00 | 4.58 ± 0.15 | 92.5 | 3.2 | |
| 3.00 | 5.80 ± 0.31 | 102.3 | 5.3 | |
| 5.00 | 7.85 ± 0.23 | 102.4 | 2.8 | |
| Match head | 0.00 | 1.81 ± 0.08 | — | 4.4 |
| 2.00 | 3.63 ± 0.15 | 91.0 | 4.2 | |
| 3.00 | 4.92 ± 0.15 | 103.7 | 3.0 | |
| 5.00 | 6.70 ± 0.18 | 97.8 | 2.7 | |
| Eye shadow | 0.00 | 0.25 ± 0.01 | — | 4.7 |
| 2.00 | 2.19 ± 0.09 | 97.0 | 4.1 | |
| 3.00 | 3.22 ± 0.11 | 99.0 | 3.3 | |
| 5.00 | 5.23 ± 0.16 | 99.6 | 3.0 | |
| Chili powder | 0.00 | 0.00 | — | — |
| 2.00 | 1.95 ± 0.09 | 97.5 | 4.7 | |
| 3.00 | 3.10 ± 0.13 | 103.3 | 4.3 | |
| 5.00 | 5.17 ± 0.27 | 103.4 | 5.4 | |
| Lao Gan Ma spice sauce | 0.00 | 0.00 | — | — |
| 2.00 | 2.08 ± 0.14 | 104.0 | 5.3 | |
| 3.00 | 2.97 ± 0.12 | 99.0 | 3.8 | |
| 5.00 | 4.85 ± 0.20 | 97.0 | 4.1 |