你听说有毒化学物质对你有害，但究竟什么是有毒化学物质呢？以下是对“有毒化学品”一词的解释，以及您在家中或在环境中遇到的常见有毒化学品的例子。将化学品标记为“有毒”或“无毒”具有误导性，因为任何化合物都可能有毒，具体取决于接触途径和剂量。例如，如果你喝足够的话，即使是水也是有毒的。毒性取决于剂量和暴露之外的其他因素，包括物种，年龄和性别。例如，人类可以吃巧克力，但它对狗有毒。在某种程度上，所有化学品都是有毒的。同样，对于几乎所有未见毒性作用的物质，都有最低剂量，称为毒性终点。化学物质既是生命必需品又是有毒物质。一个例子是铁。人类需要低剂量的铁来制造血细胞并执行其他生化任务，但过量的铁是致命的。氧是另一个例子。
英国思克莱德大学Essay代写：什么是有毒化学品？
You’ve heard that toxic chemicals are bad for you, but what exactly is a toxic chemical? Here’s an explanation of what is meant by the term “toxic chemical” as well as examples of common toxic chemicals you may have in your home or encounter in the environment.Labeling a chemical as “toxic” or “non-toxic” is misleading because any compound can be toxic, depending on the route of exposure and the dose. For example, even water is toxic if you drink enough of it. Toxicity depends on other factors besides dose and exposure, including species, age, and gender. For example, humans can eat chocolate, yet it’s toxic to dogs. In a way, all chemicals are toxic. Similarly, there is a minimum dose for nearly all substances below which toxic effects are not seen, called the toxicity endpoint. A chemical can be both necessary for life and toxic. An example is iron. Humans need low doses of iron to make blood cells and perform other biochemical tasks, yet an overdose of iron is deadly. Oxygen is another example.