中文内容由 Google Cloud Translation 自动生成，仅供参考；请以英文原文为准。问答资料来自欧盟化学品管理局（ECHA）官方网站。
答案（中文）
在许多情况下，只有当供应链中的参与者提供相应的信息时，才有可能识别物品中的物质（即候选清单物质）并量化其数量。因此，供应链沟通是收集所需信息以确定您在 REACH 下的义务的最重要和最有效的方式。这些信息可以通过以下方式获得：来自欧盟供应商的标准化 REACH 信息，例如安全数据表 (SDS) 用于交换物品信息的自愿信息工具，例如 IT 系统和工具 向供应链上游请求信息建议对从供应商处收到的信息进行适当评估。您需要的信息通常可以从位于欧洲经济区 - EEA 的物质/混合物供应商处获得的标准化信息中获取（例如 SDS，或者在不需要 SDS 的情况下，安全信息和监管要求（REACH 第 32 条））。在欧洲经济区 (EEA)，如果物品中某种候选清单物质的含量超过 0.1% w/w，供应商必须提供可用的相关安全信息（REACH 第 33 条），至少包括该物质的名称。请注意，信息沟通义务源于物品中存在候选清单物质。无论供应商是否知晓这些物质的存在，这些义务均适用。因此，寻求有关候选清单物质存在的信息符合供应商的利益。在供应链中主动提出请求通常有助于获取必要信息，尤其是在物品供应商位于欧洲经济区以外的情况下。化学分析虽然是识别和量化物品中物质的一种可能方法，但它耗时、成本高且难以组织。如果其他获取信息的方法失败或变得过于复杂，进行化学分析仍然是获取物品成分信息的一种选择。化学分析在某些情况下可能很有帮助。它可以用来获取符合 REACH 法规所需的信息，并确认从供应商处收到的信息。更多信息，请参阅物品中物质要求指南第 5 章和附录 5：http://echa.europa.eu/guidance-documents/guidance-on-reach
Answer (EN)
Identifying substances in articles, namely Candidate List substances, and quantifying their amounts is in many cases only possible if the respective information is made available by the actors in the supply chain. Supply chain communication is therefore the most important and efficient way of gathering the information needed in order to identify your obligations under REACH. This information can be obtained via, e.g.:
Standardised REACH information from suppliers in the EU, e.g. safety data sheets (SDSs)
Voluntary information tools to exchange information on articles, e.g. IT systems and tools
Requesting information up the supply chain
It is advised that the information received from suppliers is properly evaluated.
The information you need can often be derived from standardised information that is obtained from suppliers of substances/mixtures based in the European Economic Area - EEA (e.g. SDSs or, where a SDS is not required, safety information and regulatory requirements (Article 32 of the REACH)). In the EEA, suppliers of articles containing more than 0.1% w/w of a Candidate List substance must provide available and relevant safety information (Article 33 of the REACH), including, as a minimum, the name of that substance.
Please be aware that the communication obligations arise from the presence of the Candidate List substance in the article. These obligations apply regardless of whether or not the supplier is aware of the presence of the substances. Therefore, it is in the interests of the supplier to seek information on the presence of Candidate List substances. Proactive requests in the supply chain are often useful to obtain the necessary information, in particular when the supplier of the article is outside the EEA.
Chemical analysis, although a possible way to identify and quantify substances in articles, is time consuming, costly and difficult to organise. If other approaches to obtaining information fail or become too complicated, conducting chemical analysis may nevertheless be an option to obtain information on the composition of articles. Chemical analysis may be helpful in certain situations. It can serve to obtain information needed for compliance with REACH and to confirm the information received from suppliers.
For more information, see Chapter 5 and Appendix 5 of the Guidance on requirements for substances in articles:
http://echa.europa.eu/guidance-documents/guidance-on-reach