this post was submitted on 02 Jul 2025
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doomer
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My whole thing is, the term “plastic” can refer to a ton of different materials and while most are stable to the point of non-reactivity, most of these materials are essentially organic substances (hydrogen, carbon, oxygen, nitrogen, etc). I never see anyone talk about methods or standard deviations or anything like that it’s just “there’s a spoon in your brain!” Is there? it’s LDPE specifically? Styrene? PVC? what are we talking about?
Mostly polyethylene
I'm not fully convinced that py-GC/MS is great for plastics quantitation but there you go
Oh cool the most basic hydrocarbon chain lol. No I too have doubts on quantifying plastics with GC/MS. I don’t run tests like that but I do work with the results/analytical and unreactive plastic compounds like this are almost never detected with confidence.
The data is good to see though where did you get this?
The data is from this paper - https://www.nature.com/articles/s41591-024-03453-1
Nice! After doing some research it seems the general consensus is that LDIR is better for detecting and distinguishing plastics, but only detects down to a radius of ~5um. In this paper they opted to use py-GC/MS in order to document smaller particles.
The problem with pyrolysis however is that by busting everything up it’s more likely that polyethylene can be confused with other hydrocarbons. In the paper it seems their only confirmation is that the data matches up with other labs that have run the same py-GC/MS tests. The paper also mentioned someone using electron microscopy to see microplastics in brain tissue, describing them as “nanoscale shard-like fragments.” However there’s no source for it and I can’t find it.
I did find this article comparing microplastic detection methods I thought was pretty interesting. A few years old tho.