| Aa - Acetn | Nummer |
| Abamectin | 14 |
| Abfallnitriersäure | 2 |
| Abflussreiniger | |
| Abgas | 16 / 19a |
| Abgase | 6 / # 19a |
| Abietinsäure | 16 / 18 |
| Abietylalkohol | 18 |
| Abrin | 3 / # 1 Starkes Reizgift |
| Abrusbohne | # 227 +++ |
| Abrus precatorius | 3a / 16 |
| Absinthöl | 16 |
| Absorptionsöle | 10 / 19a |
| Acacia melanoxylon | 18 |
| Acajubaum | 16 |
| Acalypha hispida | |
| Acalypha indica | |
| Acebutolol | xxx |
| Ace-Hemmer | xxx |
| Acemetacin | 16 |
| Acenaphthenchinon | 16 / 13 |
| Acenocoumarol | 3a |
| Acephat | 14 |
| Acesulfam-K | 16 |
| Acetal | |
| Acetaldehyd | 14 / 19a |
| Acetaldehyd-di-ethylacetal | 16 |
| Acetaldehyd-di-methylacetal | |
| Acetaldehyd-oxim | xxx |
| Acetaldol | # 2 Giftig |
| Acetamid | 14 / # (19a) |
| Acetamidinium-chlorid | 16 |
| 4-Acetamidobenzol-sulfonylchlorid | 2 |
| 3-(5-Acetamido-4-(4-[4,6-bis(3-di-ethylamino-propylamino) -1,3,5-triazin-2-yl-amino]-phenylazo)-2-(2-methoxy-ethoxy) phenylazo)-6-amino-4-hydroxy-2-naphthalen-sulfonsäure |
|
| 2-Acetamido-5-chlor-benzoxazol | 16 |
| 1-Acetamido-7-hydroxy-naphthalin | 9 / 16 / 13 |
| 2-Acetamido-4-(5-nitro-2-furyl)-thiazol | # (19a) |
| 7-Acetamido-1,2,3,10-tetra-methoxy-5,6,7,9-tetra-hydro- benz[a]-heptalenon |
14 / 16 / # (19c) / »Tödlich(!)« |
| 6-Acetamido-4-trifluor-methyl-sulfon-amido-1,3-xylol | 14 / 18 / 19 |
| 5-Acetamid-1,3,4-thiadiazol-2-sulfonamid | # (19b) / # 4 Giftig |
| 1-Acetamino-4-ethoxybenzol | 14 / 15 / gelegentl. 18 / # (19a+c) |
| 4-Acetaminophenol | 9 / selten 18 |
| Acetanhydrid | 2 / # 217 Gas |
| Acetanilid | 16 |
| Acet-p-anisidin | |
| Acetessigsäure-allylester | 11 |
| Acetessigsäure-ethylester | 10 |
| Acetessigsäure-2-methoxy-ethylester | 14 / # (19b) |
| Acetessigsäure-methylester | 16 |
| Acethydroxamsäure | 16 / 19 / # (19b) |