| Acronym | Meaning |
 | FRM | Federal Reference Method |
| ATH | Aluminum Trihydrate |
| NEAR | Near Earth Asteroid Rendezvous |
| PT | Perturbation Theory |
| FWA | Fluorescent Whitening Agent |
| PPE | Porcine Pancreatic Elastase |
| ITD | Ion Trap Detector (mass Spectrometry) |
| WERL | Water Engineering Research Laboratory |
| FTU | Formazine Turbidity Unit |
| D.I. | Direct Injection [of Diesel Engines] |
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