Acetic acid is a clear, colorless, organic liquid with a pungent odor similar to household vinegar.乙酸有多种用途,包括作为原材料和溶剂生产其他化学产品、油气生产以及食品和制药业。

The Toxic Substances Control Act (TSCA) is the United States' primary chemical management law.2016年,更新TSCA后在国会压倒双党支持下通过后签署为法律修正TSCA需要美国环境保护局(EPA)对所有新化学品和现有化学品安全审查,它要求机构识别高低优先级风险评估化学品。

EPA进程的三个阶段

什么高低优先级化学品?

a高优先级命名则指EPA启动TSCA风险评价It is important to note that—as EPA has said—designation of a substance as a high priority "does not constitute a finding of risk" and should not be cause for concern.

TSCA requires that at least 50 percent of all high-priority designations be drawn from the 2014 Update of the TSCA Work Plan and that EPA give preference to those chemicals that have a persistence and bioaccumulation score of three, are a known human carcinogen, or have high acute or chronic toxicity.

The entire prioritization process for a chemical—from announcement of a potential candidate to final designation of a priority—may take from 9–12 months.EPA < a hrefss//www.epa.gov/asssing-and-manage-chemicas-under-tsca/risk-values-风险评估必须将危险信息与指定高优先级物质的使用和接触信息综合起来,以确定该化学品在使用条件下是否对健康或环境构成不合理的风险EPA无法在风险评估中考虑非风险因素(如成本/效益)EPA必须在风险评估中考虑潜在接触或敏感子群的风险,如子工进一步,风险评估必须根植于现有最佳科学和科学证据权重,正如规约第26节所要求的那样风险评估过程和时间线细节见EPA网站 .ss/sassing-and-manage-stemistics-under-tsca/service-values-TSCA风险评估过程期间,化学制造商、处理器、进口商和下游用户将有机会向EPA提供数据、资料和公开评论供其审议。完成后,EPA必须指定列表中的另一高优先级化学品,以确保风险评估队列保持全数Think of the prioritization and risk evaluation processes as operating like a conveyor belt, meant to ensure EPA is continually designating priority substances and conducting risk evaluations. 

What is Risk Management?

If the risk evaluation determines that a chemical presents an unreasonable risk to human health or the environment under the conditions of use evaluated, EPA must undertake a risk management process to mitigate the unreasonable risk identified.

During the risk management process, EPA has a variety of options for regulatory restrictions available to it to reduce risk.  This could include requirements regarding how the chemical can be used in products, labeling requirements, use restrictions, phase-outs or outright bans on use of the chemical in products. 

Key Takeaways:

• A high-priority designation does not mean a chemical is poses any risk. EPA has made clear that designation as a high priority chemical "does not constitute a finding of risk" and should not be cause for concern.
• EPA must conduct risk evaluations for high priority chemicals that integrate hazard information with use and exposure information on the chemical.对成本或其他非风险因素的考虑必须排除Scientific information and approaches must be used in a way that is consistent with the requirements of TSCA regarding the best available science and weight of the scientific evidence. 
• EPA will designate a high priority chemical when another chemical's risk evaluation is completed. This ensures that EPA's risk evaluation queue always remains full, e.g., conducting at least 20 at any given time. 
• EPA has several risk management options available to control or mitigate any unreasonable risks identified of a chemical under its conditions of use.

The post How EPA Prioritizes Chemical Risk Assessments appeared first on ChemicalSafetyFacts.org.

1,4-Dioxane is a volatile, flammable, colorless liquid primarily used as an intermediate in the manufacture of other chemicals and as a laboratory reagent.srcs/ 12143 //m.abdiipekci.com/olefins/ Frii,2020年11月20日

Olefins are a class of chemicals made up of hydrogen and carbon with one or more pairs of carbon atoms … Continued

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Olefins are a class of chemicals made up of hydrogen and carbon with one or more pairs of carbon atoms linked by a double bond.Ethylene, propylene and 1,3-butadiene are examples of olefins.

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The following video, infographic and one-pagers developed by the American Chemistry Council demonstrate how chemicals that may seem very similar at first glance actually have very different structures, uses and safety profiles.

• Video: Chemical Families

• Why Chemical Families are Like Berries

• Misconceptions about Chemical Families: Let's Break it Down

• The Myth vs.the Truth about Banning Chemical Families

The post Chemical Families: Sometimes Similar, But Far From the Same appeared first on ChemicalSafetyFacts.org.