美国加州发布“微塑料”定义

2020年3月19日，美国加州水资源控制委员会（State Water Resource Control Board）宣布 “饮用水中的微塑料”的定义草案，并附有一份工作人员文件和其他规范。拟议案文包括以下内容：

“饮用水中的微塑料定义：可能添加了化学添加剂或其他物质的固体聚合物材料，这些材料是至少有两个尺寸大于1且小于5000微米（μm）的颗粒。未经化学改性（水解除外）的天然聚合物除外。”

“Microplastics in Drinking Water are defined as solid polymerimgc materials to which chemical additives or other substances may have been added, which are particles that have at least two dimensions that are greater than 1 and less than 5,000 micrometers (μm). Polymers that are derived in nature that have not been chemically modified (other than by hydrolysis) are excluded.”