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答案（中文）
是的。以下是理由和一些示例：三氧化铬（EC 编号 215-607-8）与水接触后会生成两种酸和几种低聚物：铬酸（EC 编号 231-801-5）、重铬酸（EC 编号 236-881-5）、铬酸和重铬酸的低聚物（以下称为“铬酸及其低聚物”）。这些化学物质均被认定为高度关注物质 (SVHC)，并作为两个单独的条目列入附件 XIV1。这两个条目的最后申请日期（2016 年 3 月 21 日）和日落日期（2017 年 9 月 21 日）相同。由三氧化铬在水中生成的铬酸及其低聚物通常被称为三氧化铬水溶液。关于授权要求，在某些情况下，出于实际原因，将铬酸及其低聚物视为三氧化铬的水溶液可能是合理的。根据 REACH 规定，将三氧化铬添加到水中生成铬酸及其低聚物属于物质的使用。这可能是配方师对氧化铬的谨慎使用，也可能是氧化铬使用过程中集成工艺的一部分。考虑到这一点，在授权申请中，此操作应被视为“申请使用”，并在化学品安全报告 (CSR)、替代品分析以及（如适用）社会经济分析中予以说明。因此，在三氧化铬与水接触的初始步骤之后，旨在涵盖供应链下游用途的授权申请必须参考铬酸及其低聚物。该答案严格限于三氧化铬和由三氧化铬在水中生成的铬酸及其低聚物。水溶液中的系统是多种化学物质之间的复杂平衡，这取决于几个物理化学参数，并且不同的化学物质无法从水溶液中分离出来。因此，该答案不应类比应用于任何其他物质。下表描述了三氧化铬和/或铬酸及其低聚物的制造商/进口商/用户提出授权申请时的可能情景。技术说明位于表格的最后一列。一般而言，IUCLID 的 1.1、1.2 和 1.3 节应始终引用申请的物质（即表 1 第三列“授权申请”中所示的物质）。此外，如果进口/使用的物质不止一种（下文情景 2），或者实际进口/使用的物质与申请的物质不同（下文情景 3b），则应在 1.2 节中描述此信息。对于每种用途，评估报告中进行的评估（CSR、替代品分析 (AoA) 和社会经济分析 (SEA)）应与该用途相关的物质相关。在使用层面上的物质（例如，用于电镀的铬酸及其低聚物）可能确实与申请的物质（例如，三氧化铬）在危害、物理形态/接触 Cr(VI) 的可能性、替代品等方面有所不同。表 1 - 三氧化铬和/或铬酸及其低聚物的制造商/进口商提出申请时可能出现的情况2请参阅 Q&A=804（由三氧化铬在水中生成的铬酸及其低聚物是否需要根据 REACH 进行单独注册？）1 条目#17：“由三氧化铬及其低聚物生成的酸。包含以下物质的组：铬酸、重铬酸以及铬酸和重铬酸的低聚物’ 以及条目#16：“三氧化铬”2 由三氧化铬生成的铬酸及其低聚物可在IUCLID第1.1和1.2节中描述，例如，作为UVCB物质，其IUPAC名称为“由三氧化铬及其低聚物生成的酸”，简要描述为“通常包含相互平衡的铬酸和重铬酸低聚物的复杂组合物”。成分可列为i)铬酸、ii)重铬酸和iii)铬酸和重铬酸的低聚物3。可能需要进一步澄清，其他方法是否能达到与水溶液类似的平衡。
Answer (EN)
Yes. The reasoning and some example are provided below:When brought in contact with water, chromium trioxide (EC number 215-607-8) forms two acids and several oligomers: Chromic acid (EC number 231-801-5), Dichromic acid (EC number 236-881-5), Oligomers of chromic acid and dichromic acid (further referred as "Chromic acids and their oligomers"). These chemical species are all identified as substances of very high concern (SVHC) and included in Annex XIV1 as two separate entries. Latest Application Date (21 March 2016) and Sunset Date (21 September 2017) are identical for both entries.Chromic acids and their oligomers generated in water from chromium trioxide are commonly referred to as an aqueous solution of chromium trioxide. With regard to the authorisation requirements, it may be justifiable in some situations to consider for practical reasons chromic acids and their oligomers as an aqueous solution of chromium trioxide.The generation of chromic acids and their oligomers by adding chromium trioxide to water is a use of a substance under REACH. This may be a discreet use of chromium oxide by a formulator or part of an integrated process in the use of chromium oxide. Considering this in the context of applications for authorisation, this operation should be considered as a "use applied for" and be addressed in the chemical safety report (CSR), the analysis of alternatives and, if appropriate, in the socio-economic analysis. Hence, applications for authorisation that are meant to cover further uses down the supply chain after the initial step in which chromium trioxide is brought in contact with water, have to refer to the chromic acids and their oligomers.This answer is strictly limited to chromium trioxide and chromic acids and their oligomers generated from chromium trioxide in water. The system in aqueous solution is a complex equilibrium between multiple chemical species which depends on several physico-chemical parameters and the different chemical species cannot be isolated from the aqueous solution. The answer should thus not be applied by analogy to any other substance.The table below describes possible scenarios in the case of an application for authorisation is made by the manufacturer/importer/user of chromium trioxide and/or chromic acids and their oligomers. Technical instructions are provided in the last column of the table.As a general rule, sections 1.1, 1.2 and 1.3 of IUCLID should always refer to the substance applied for (i.e. the substance indicated in the third column - "Application for authorisation" of Table 1). In addition, if there is more than one substance which is imported/used (scenario #2 below) or if the substance actually imported/used is different from the substance applied for (scenario #3b below) this information should be described in section 1.2.For each use, the assessment performed in the assessment reports (CSR, analysis of alternatives (AoA) and socio-economic analysis (SEA)) should relate to the substance relevant for that use. The substance at the use level (e.g. chromic acids and their oligomers - used in electroplating) might indeed differ from the substance applied for (e.g. chromium trioxide) in terms of hazard, physical form / potential for exposure to Cr(VI), alternatives, etc.Table 1 - Possible scenarios in the case of an application made by the manufacturer/importer of chromium trioxide and/or chromic acids and their oligomers2Please see also Q&A=804 (Do chromic acids and their oligomers, generated in water from chromium trioxide, require their own registration under REACH?)1 Entry#17: 'Acids generated from chromium trioxide and their oligomers. Group containing: chromic acid, dichromic acid, and oligomers of chromic acid and dichromic acid' And Entry#16: 'chromium trioxide'2 Chromic acids and their oligomers generated from chromium trioxide could be described in IUCLID sections 1.1 and 1.2 e.g. as a UVCB substance with IUPAC name "Acids generated from chromium trioxide and their oligomers" and Brief description "complex composition typically including oligomers of chromic and dichromic acids in equilibrium with each other". As constituents there could be listed i) chromic acid, ii) dichromic acid, and iii) oligomers of chromic and dichromic acids.3 Further clarification may be needed as to whether alternative methods would lead to similar equilibrium as for aqueous solutions