plastic-pollution Environment

6 个科学问题 · 环境生态 Environment

本页目录

海洋塑料的'源-汇'失衡如何解释环流垃圾带的形成?

How does the ocean plastic source-sink imbalance explain garbage-patch formation?

约80%海洋塑料来自陆地河流输入,进入副热带环流后受地转流汇聚滞留,降解极慢而持续累积,形成如大太平洋垃圾带等环流垃圾带;其质量以碎片化微塑料为主,清理难度远大于拦截源头。
Roughly 80% of marine plastic comes from land via rivers; entering subtropical gyres it converges and stagnates, accumulating far faster than it degrades, forming patches like the Great Pacific Garbage Patch whose mass is mostly fragmented microplastic—far harder to clean than to intercept at source.
难度 专业 · 适合 高中(15-18) CC BY 4.0 · 来源待核验 · Source pending review
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出处备注:此条未指向带版次的可引用著作(通识性内容、机构文件或未展开的英文书名),本库不提供独立书目出处;如需精确引用,需由编辑补全具体篇目与版次。

The Ocean Cleanup;Science

The Ocean Cleanup;Science

#海洋环流 #垃圾带

微塑料作为污染物载体(vector)的机制是什么?

What is the mechanism by which microplastics act as pollutant vectors?

疏水性微塑料表面能吸附持久性有机污染物(POPs)与重金属,其浓度可比周围海水高数个数量级;被生物摄食后,污染物可在肠道释放并生物放大,使微塑料从'物理危害'升级为'化学传递载体'。
Hydrophobic microplastics adsorb POPs and heavy metals at concentrations orders of magnitude above seawater; once ingested, contaminants can desorb in the gut and biomagnify, upgrading microplastics from a physical hazard to a chemical delivery vector.
难度 专业 · 适合 高中(15-18) CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source

出处备注:此条未指向带版次的可引用著作(通识性内容、机构文件或未展开的英文书名),本库不提供独立书目出处;如需精确引用,需由编辑补全具体篇目与版次。

Environ. Sci. Technol.

EST

#微塑料 #污染物载体

生物可降解塑料真的能解决塑料污染吗?

Can biodegradable plastics really solve plastic pollution?

多数'可降解'塑料需特定工业堆肥的高温高湿条件才能分解,在自然海洋或土壤环境下降解极慢,且与传统塑料混收会污染回收流。它只是补充而非替代减塑。
Most 'biodegradable' plastics need industrial-compost heat and humidity to break down, degrading slowly in open oceans or soil, and they contaminate recycling streams if mixed with conventional plastic. They supplement, not replace, reduction.
难度 进阶 · 适合 初中(12-15) CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source

出处备注:此条未指向带版次的可引用著作(通识性内容、机构文件或未展开的英文书名),本库不提供独立书目出处;如需精确引用,需由编辑补全具体篇目与版次。

Science;EU Plastics Strategy

Science;EU

#可降解塑料 #工业堆肥

化学回收(热解/解聚)与传统机械回收有何本质区别?

How does chemical recycling fundamentally differ from mechanical recycling?

机械回收是把塑料清洗熔融再造粒,受杂质与降级限制;化学回收用热解、解聚把聚合物还原成单体或油,可处理混合脏料并产出原生级原料,但能耗与碳排放高,目前规模化经济性仍存疑。
Mechanical recycling washes and remelts plastic into pellets, limited by impurities and downcycling; chemical recycling uses pyrolysis or depolymerization to revert polymers to monomers or oil, handling mixed dirty feedstock and yielding virgin-grade material—but at high energy and carbon cost, with questionable scale-up economics.
难度 进阶 · 适合 小学高段(9-12) CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source

左玉辉 主编,《环境学》第2版,高等教育出版社,2009

Zuo Yuhui ed., Environmental Science, 2nd ed., Higher Education Press, 2009

#化学回收 #热解

为什么要区分塑料的'可回收'标识?

Why distinguish plastic recycling codes?

三角数字1–7标明了树脂类型,如PET(1)、HDPE(2)易回收,而PS(6)、PVC(3)难回收且含增塑剂。混收会降低再生料品质,因此分类投放直接影响回收可行性与安全性。
The 1–7 resin codes identify polymer type: PET(1) and HDPE(2) recycle easily, while PS(6) and PVC(3) are hard to recycle and may carry plasticizers. Mixing lowers recyclate quality, so sorting directly determines feasibility and safety.
难度 进阶 · 适合 大众 CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source

左玉辉 主编,《环境学》第2版,高等教育出版社,2009

Zuo Yuhui ed., Environmental Science, 2nd ed., Higher Education Press, 2009

#树脂标识 #分类

一次性塑料吸管为何成为限塑重点?

Why target single-use plastic straws?

吸管体积小、重量轻、回收经济性差,极易进入海洋被海龟海鸟误食,象征'不必要的一次性塑料',因而成为减塑宣传与立法的切入点。
Straws are tiny, light, uneconomic to recycle, and easily ingested by turtles and seabirds, epitomizing 'unnecessary single-use plastic,' making them a natural focus for reduction campaigns and bans.
难度 入门 · 适合 大众 CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source

左玉辉 主编,《环境学》第2版,高等教育出版社,2009

Zuo Yuhui ed., Environmental Science, 2nd ed., Higher Education Press, 2009

#一次性塑料 #限塑