| Acronym | Meaning |
| XRS | X-Ray Spectroscopy |
| ICAT | Isotope-coded Affinity Tag |
| APCA | Air Pollution Control Association |
| NNLS | Non-negative Least-squares |
| APEO | Alkylphenol Ethoxylates |
| AUHF | Annihilated Unrestricted Hartree-Fock Method |
| SCA-QD-MBPT | Self-consistently Adapted (core Reference State) Quasidegenerate Many-body Perturbation Theory |
| PBFFF | Potential Barrier Field-flow Fractionation |
| RAP | Remedial Action Project Or Plan |
| SNARL | Suggested No-adverse Response Level |