Table 3.
Verification data for 42 oil samples (S1–S42) at Abs = 0.75 using Equation (2).
| Sample | Measured CI 1 | Measured Cutoff Wavelength (nm) | Calculated CI 2 | Difference in CI 3 | Standard Deviation | Standard Error |
|---|---|---|---|---|---|---|
| S1 | 0.5 | 352 | 0.7 | 0.2 | 0.0733 | 0.033 |
| S2 | 0.5 | 357 | 0.8 | 0.3 | ||
| S3 | 0.5 | 346 | 0.6 | 0.1 | ||
| S4 | 0.5 | 361 | 0.8 | 0.3 | ||
| S5 | 0.5 | 345 | 0.6 | 0.1 | ||
| S6 | 1.0 | 371 | 0.9 | −0.1 | 0.1174 | 0.053 |
| S7 | 1.0 | 370 | 0.9 | −0.1 | ||
| S8 | 1.0 | 379 | 1.0 | 0.0 | ||
| S9 | 1.0 | 385 | 1.1 | 0.1 | ||
| S10 | 1.0 | 389 | 1.2 | 0.2 | ||
| S11 | 1.5 | 427 | 1.9 | 0.4 | 0.2238 | 0.100 |
| S12 | 1.5 | 409 | 1.5 | 0.0 | ||
| S13 | 1.5 | 402 | 1.4 | −0.1 | ||
| S14 | 1.5 | 425 | 1.9 | 0.4 | ||
| S15 | 1.5 | 425 | 1.9 | 0.4 | ||
| S16 | 2.0 | 447 | 2.4 | 0.4 | 0.1839 | 0.082 |
| S17 | 2.0 | 447 | 2.4 | 0.4 | ||
| S18 | 2.0 | 440 | 2.2 | 0.2 | ||
| S19 | 2.0 | 440 | 2.2 | 0.2 | ||
| S20 | 2.0 | 428 | 1.9 | −0.1 | ||
| S21 | 2.5 | 451 | 2.5 | 0.0 | 0.0777 | 0.035 |
| S22 | 2.5 | 458 | 2.7 | 0.2 | ||
| S23 | 2.5 | 456 | 2.6 | 0.1 | ||
| S24 | 2.5 | 453 | 2.5 | 0.0 | ||
| S25 | 2.5 | 452 | 2.5 | 0.0 | ||
| S26 | 3.0 | 467 | 2.9 | −0.1 | 0.1723 | 0.077 |
| S27 | 3.0 | 477 | 3.2 | 0.2 | ||
| S28 | 3.0 | 477 | 3.2 | 0.2 | ||
| S29 | 3.0 | 471 | 3.0 | 0.0 | ||
| S30 | 3.0 | 464 | 2.8 | −0.2 | ||
| S31 | 3.5 | 487 | 3.5 | 0.0 | - | - |
| S32 | 3.5 | 495 | 3.8 | 0.3 | - | - |
| S33 | 4.0 | 504 | 4.1 | 0.1 | - | - |
| S34 | 4.0 | 495 | 3.8 | −0.2 | - | - |
| S35 | 4.5 | 511 | 4.3 | −0.2 | - | - |
| S36 | 4.5 | 513 | 4.4 | −0.1 | - | - |
| S37 | 5.0 | 523 | 4.8 | −0.2 | - | - |
| S38 | 5.5 | 538 | 5.3 | −0.2 | - | - |
| S39 | 5.5 | 536 | 5.2 | −0.3 | - | - |
| S40 | 6.5 | 568 | 6.4 | −0.1 | - | - |
| S41 | 7.0 | 582 | 7.0 | 0.0 | - | - |
| S42 | 7.5 | 592 | 7.3 | −0.2 | - | - |
1 Color index based on measurement in accordance of ASTM D 1500, 2 Color index calculated based on Equation (2), 3 Difference in CI = Calculated CI – Measured CI.