通过诉讼获得的历史行业文件显示，化工公司几十年来已知悉摄入的微塑料可渗透内脏器官。
Archived Documents Reveal Chemical Industry Knew of Microplastic Infiltration Risks Since 1974 Historical industry documents obtained through litigation reveal that chemical companies have known for decades that ingested microplastics can penetrate internal organs.
据《洛杉矶时报》报道的调查，德国科学家格哈德·福尔克海默于1974年提出证据，表明摄入的聚氯乙烯颗粒进入血液循环，并到达动物的肝脏、大脑和肺部。
According to an investigation reported by the Los Angeles Times, German scientist Gerhard Volkheimer presented evidence in 1974 showing ingested PVC particles entered the bloodstream and reached the liver, brain, and lungs of animals.
内部记录（包括联合碳化物公司1975年的一份备忘录）显示，行业科学家对这些发现感到震惊。
Internal records, including a 1975 memo from Union Carbide, show industry scientists treated the findings with alarm.
斯坦福大学流行病学家特雷西·伍德拉夫指出，行业对危险保持沉默；而美国化学理事会代表克雷格·戴维斯则辩称，当时存在活跃的科学辩论，而非压制。目前的研究仍在调查组织污染和毒性，检测方法仍有争议。
Stanford epidemiologist Tracey Woodruff stated the industry remained silent on the dangers, while American Chemistry Council representative Craig Davis argued that active scientific debate occurred rather than suppression. Current research continues to investigate tissue contamination and toxicity amid contested detection methods.