Table 2. Maximum Wavelength of Absorption, ENR, and Normalized ENR Values of Traditional Solvents and Their Mixturesa.
| solvents | λmax | ENR | ENRN | % water |
|---|---|---|---|---|
| water | 585.32 | 48.85 ± 0.17 | 1.000 | |
| Lac + Bet + Dec (5:1:0.1) | 574.33 | 49.78 ± 0.05 | 0.903 ± 0.010 | N/D |
| Thy + Bor (1:1) | 562.33 | 50.84 ± 0.14 | 0.792 ± 0.010 | N/D |
| Men + Thy (1:1) | 561.67 | 50.90 ± 0.05 | 0.786 ± 0.010 | 0.157 ± 0.020 |
| methanol | 559.50 | 51.10 ± 0.05 | 0.765 ± 0.010 | 22,265 ± 0.210 |
| Lac + Bet + Dec (2:1:0.35) | 555.00 | 51.52 ± 0.09 | 0.722 ± 0.010 | N/D |
| Men + Thy (2:1) | 553.33 | 51.67 ± 0.11 | 0.706 ± 0.010 | 0.127 ± 0.020 |
| Lac + Bet + Dec (2:1:0.25) | 553.33 | 51.67 ± 0.22 | 0.706 ± 0.020 | N/D |
| ethanol | 552.33 | 51.76 ± 0.14 | 0.696 ± 0.010 | <0.001 |
| isopropanol | 549.67 | 52.02 ± 0.07 | 0.670 ± 0.010 | 0.216 ± 0.020 |
| Men + Thy (4:1) | 549.00 | 52.08 ± 0.10 | 0.663 ± 0.010 | 0.133 ± 0.010 |
| Men + Mal (8:1) | 547.33 | 52.24 ± 0.11 | 0.646 ± 0.010 | N/D |
| Men + Thy (8:1) | 545.67 | 52.40 ± 0.06 | 0.630 ± 0.010 | N/D |
| iso-octane/isopropanol (1:9) | 542.00 | 52.75 ± 0.00 | 0.593 ± 0.010 | 0.513 ± 0.120 |
| iso-octane/isopropanol (2:8) | 541.67 | 52.78 ± 0.06 | 0.589 ± 0.010 | N/D |
| iso-octane/isopropanol (3:7) | 541.67 | 52.78 ± 0.06 | 0.589 ± 0.010 | 0.814 ± 0.090 |
| Men + Bor (7:2) | 540.33 | 52.91 ± 0.06 | 0.576 ± 0.010 | 0.158 ± 0.030 |
| Men + Lau (4:1) | 539.57 | 52.99 ± 0.07 | 0.568 ± 0.010 | 0.166 ± 0.020 |
| acetone | 539.50 | 53.00 ± 0.08 | 0.567 ± 0.010 | <0.2 |
| Men + Lau (8:1) | 538.43 | 53.01 ± 0.07 | 0.556 ± 0.000 | N/D |
| Men + Dec (2:1) | 538.00 | 53.14 ± 0.00 | 0.552 ± 0.000 | 0.203 ± 0.020 |
| Men + Myr (4:1) | 537.67 | 53.18 ± 0.06 | 0.548 ± 0.010 | N/D |
| iso-octane/iso-propanol (4:6) | 537.33 | 53.21 ± 0.11 | 0.545 ± 0.010 | 0.459 ± 0.020 |
| Men + Lau + Dec (4:1:1) | 537.00 | 53.24 ± 0.01 | 0.542 ± 0.010 | 0.088 ± 0.010 |
| Men + Dec (7:2) | 536.67 | 53.28 ± 0.11 | 0.538 ± 0.010 | 0.140 ± 0.010 |
| Men + Lau (2:1) | 535.33 | 53.41 ± 0.06 | 0.524 ± 0.010 | 0.067 ± 0.010 |
| Men + Lau + Dec (2:1:1) | 535.00 | 53.44 ± 0.10 | 0.521 ± 0.010 | 0.144 ± 0.020 |
| iso-octane/isopropanol (5:5) | 535.00 | 53.44 ± 0.10 | 0.521 ± 0.010 | 0.465 ± 0.020 |
| Men + Dec (1:3) | 532.00 | 53.74 ± 0.00 | 0.489 ± 0.000 | N/D |
| iso-octane/isopropanol (6:4) | 530.67 | 53.88 ± 0.06 | 0.475 ± 0.010 | 0.494 ± 0.140 |
| toluene | 526.00 | 54.36 ± 0.00 | 0.425 ± 0.000 | 0.049 ± 0.000 |
| iso-octane/isopropanol (7:3) | 525.67 | 54.39 ± 0.06 | 0.422 ± 0.010 | 0.361 ± 0.210 |
| Shellsol A | 525.33 | 54.42 ± 0.06 | 0.418 ± 0.010 | 0.112 ± 0.000 |
| xylene | 524.67 | 54.49 ± 0.06 | 0.411 ± 0.010 | 0.110 ± 0.000 |
| turpentine | 518.67 | 55.09± 0.06 | 0.345 ± 0.010 | N/D |
| iso-octane/isopropanol (8:2) | 518.00 | 55.55 ± 0.06 | 0.300 ± 0.010 | 0.208 ± 0.190 |
| white spirit (about 16% aromatic) | 516.67 | 55.36 ± 0.03 | 0.323 ± 0.010 | 0.051 ± 0.000 |
| iso-octane/isopropanol (9:1) | 514.67 | 55.67 ± 0.06 | 0.300 ± 0.010 | 0.168 ± 0.020 |
| Shellsol D40 | 494.50 | 57.82 ± 0.15 | 0.064 ± 0.020 | 0.008 ± 0.000 |
| Shellsol T (0% aromatic) | 494.00 | 57.88 ± 0.00 | 0.058 ± 0.000 | 0.008 ± 0.000 |
| iso-octane | 489.33 | 58.43 ± 0.03 | 0.000 | 0.006 ± 0.000 |
a
N/D—not determined.