我是否需要注册由三氧化铬在水中生成的铬酸及其低聚物？

我是否需要注册由三氧化铬在水中生成的铬酸及其低聚物？

Do I need to register chromic acids and their oligomers, generated in water from chromium trioxide?

三氧化铬 (EC: 215-607-8) 与水接触时会形成两种酸：铬酸 (EC: 231-801-5) 和重铬酸 (EC: 236-881-5) 以及几种铬酸和重铬酸的低聚物。这些化学物质通常被称为三氧化铬水溶液。关于注册义务，在某些特定情况下（如下表所述），出于实际原因，将铬酸及其低聚物视为三氧化铬水溶液可能是合理的。因此，在这些特定情况下，三氧化铬水溶液中存在的铬酸及其低聚物可以包含在三氧化铬的注册档案中。所提出的方法严格限于三氧化铬、铬酸及其由三氧化铬在水中生成的低聚物。它源于六价铬水化学中非常特殊的方面，其中水溶液系统是多种化学物质（取决于几个物理化学参数）之间的复杂平衡，这些化学物质无法从水溶液中分离出来。因此，该方法不能类比应用于任何其他物质。三氧化铬、铬酸及其低聚物的制造商和进口商必须考虑以下情况：请注意，铬酸及其低聚物包含在高度关注物质候选清单（条目）和 REACH 附件 XIV（授权清单）（条目）中的“由三氧化铬及其低聚物产生的酸”条目下。有关 REACH 授权流程中铬酸及其低聚物的具体考虑因素，请参阅问答 805。

Chromium trioxide (EC: 215-607-8), when brought in contact with water, forms two acids: chromic acid (EC: 231-801-5) and dichromic acid (EC: 236-881-5) and several oligomers of chromic acid and dichromic acid. These chemical species are commonly referred to as an aqueous solution of chromium trioxide. With regard to the obligation to register, it may be justifiable in some specific situations (described in the table below) to consider, for practical reasons, chromic acids and their oligomers as an aqueous solution of chromium trioxide. Hence, in these specific cases, chromic acids and their oligomers present in an aqueous solution of chromium trioxide can be covered by a registration dossier for chromium trioxide. The presented approach is strictly limited to chromium trioxide, chromic acids and their oligomers generated from chromium trioxide in water. It derives from very specific aspects of the chromium (VI) aqueous chemistry, where the system in aqueous solution is a complex equilibrium between multiple chemical species (depending on several physico-chemical parameters) which cannot be isolated from the aqueous solution. The approach can thus not be applied by analogy to any other substance. Manufacturers and importers of chromium trioxide, chromic acids and their oligomers have to consider the following situations:  Note that chromic acids and their oligomers are included under the entry “Acids generated from chromium trioxide and their oligomers” in the Candidate List of substances of very high concern (entry) and in Annex XIV to REACH (Authorisation List) (entry). For specific considerations on chromic acids and their oligomers in the context of the REACH authorisation process, see Q&A 805.