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）
确定候选清单物质的浓度（检查其是否超过 0.1% w/w 阈值）对于检查是否适用沟通和通知义务至关重要。物品中物质要求指南中的表 5 详细列出并解释了如何确定物品中或复杂物体（由多个物品组成的任何物体）中候选清单物质的浓度（重量比 (w/w)）的几种情况。总结：情况一。由候选清单物质本身或混合物制成的物品：浓度根据物品的总重量计算（例如，通过注塑生产的塑料椅子）情况二。用于连接两个或多个物品（复杂物体）的候选清单物质本身或混合物：候选清单物质的浓度根据复杂物体的总重量计算（例如，使用含有该物质的混合物将多个钢管焊接在一起形成的未上漆的自行车车架）情况三。涂层中的候选清单物质（例如油漆、大漆、清漆、功能涂层）- III. A) 全涂层物品；III. B) 部分涂层物品；III. C) 涂层复杂物体：（全/部分）涂层物品中候选清单物质的浓度是根据涂层物品或复杂物体的总重量计算的。情景 IV。非常复杂的物体（例如沙发、自行车、手机、汽车和飞机）：上述情景 I 至 III 规定的计算规则适用于每个物品或更简单的复杂物体。有关物品中物质要求的指南可在欧洲化学品管理局 (ECHA) 网站上找到：http://echa.europa.eu/guidance-documents/guidance-on-reach
Answer (EN)
The determination of the concentration of a Candidate List substance, to check whether it is above the 0.1% w/w threshold or not, is essential to check whether communication and notification obligations apply.
Table 5 in the Guidance on requirements for substances in articles illustrates and explains in detail several scenarios on how to determine the concentration of a Candidate List substance (weight by weight (w/w)) in an article or in articles incorporated in a complex object (any object made up of more than one article). In summary:
Scenario I. Article made from a Candidate List substance as such or in a mixture: the concentration is calculated over the total weight of the article (e.g. plastic chair produced by injection moulding)
Scenario II. Candidate List substance as such or in a mixture used for joining two or more articles (complex object): the concentration of the Candidate List substance is calculated over the total weight of the complex object (e.g. unpainted bicycle frame formed by welding together multiple steel tubes, using a mixture containing the substance)
Scenario III. Candidate List substance in coatings (e.g. paint, lacquer, varnish, functional coating) - III. A) Fully coated article; III. B) Partially coated article; III. C) Coated complex object: the concentration of the Candidate List substance in the (fully/partially) coated article is calculated over the total weight of the coated article or of the complex object
Scenario IV. Very complex objects (e.g. sofa, bicycle, mobile phone, car and aircraft): the calculation rules set out for scenarios I to III above apply for each article or simpler complex object.
The Guidance on requirements for substances in articles is available on the ECHA website at: http://echa.europa.eu/guidance-documents/guidance-on-reach