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Deprotonation trends for neutral and anionic As(III) oxy- and thio-species. Emboldened species are likely to dominate at circum-neutral pH
| S/As | Charge (0) | Charge (1-) | Charge (2-) | Charge (3-) |
| 0 | As(OH)30 | As(OH)2O- | As(OH)O22- | AsO33- |
| 1 | As(OH)2(SH)0 | As(OH)2S- | AsO2HS2- | AsO2S3- |
| 2 | As(OH)(SH)20 | As(OH)S2H- | As(OH)S22- | AsOS23- |
| 3 | As(SH)3 | AsS3H2- | AsS3H2- | AsS33- |
| 4 | As(SH)4H0 | As(SH)4 | As(SH)3S2- | As(SH)2S23- |
