| Sample identification n = 6 | Wavelength (nm) | Absorbance | Concentration (ppm) |
| BIS1 | 352 | 0.22034 | 26 |
| BIS2 | 352 | 0.22034 | 26 |
| BIS3 | 352 | 0.22034 | 26 |
| BIS4 | 352 | 0.22034 | 26 |
| BIS5 | 352 | 0.22034 | 26 |
| BIS6 | 352 | 0.22034 | 26 |