| Property |
α-HCH |
β-HCH |
γ-HCH |
δ-HCH |
| Conformation |
aaeeee |
eeeeee |
aaaeee |
aeeeee |
| Molecular weight |
290.83 |
290.83 |
290.83 |
290.83 |
| Melting point |
159-160 °C |
314-315 °C |
112.5°C |
141-142°C |
| Boiling point |
288°C |
60°C |
323.4 °C |
60 °C |
| Water solubility |
2.03ppm |
0.2ppm |
7.4ppm |
15.7ppm |
| Vapour pressure |
(1.6 ± 0.9) × 10-2 |
(4.2 ± 0.3) × 10-5 |
(5.3 ± 1.4) × 10-3 |
2.1 × 10-3 |
| Log Kow |
3.9 ± 0.2 |
3.9 ± 0.1 |
3.7 ± 0.5 |
4.1 ± 0.02 |
| Solubility inorganic solvents |
| Ethanol (in 100 g) |
1.8g |
1.1g |
6.4g |
24.4g |
| Ether (in 100 g) |
6.2g |
1.8g |
20.8g |
35.4g |
| Benzene (in 100 g) |
- |
1.9g |
28.9g |
41.4g |
| BCF in human fat |
20 ± 8 |
527 ± 140 |
19 ± 9 |
8.5 |
| BCF in aquatic animals |
2.6 ± 0.5 |
2.9 ± 0.3 |
2.5 ± 0.4 |
- |
|
| ±: values are standard errors; BCF: bio concentration factor; - : not available. |
| Table 1: Physical and chemical properties of hexachlorocyclohexane isomers [16-19]. |
