Avoiding and reducing microplastic false positives from dry glove contact
58 points by efavdb 11 hours ago | 10 comments
schobi 5 hours ago
Summary: dry contact with nearly any laboratory glove will lead to sample contamination and over estimation of microplastics.
They found one type of clean room gloves that contaminate less.
replyIs there any indication on how bad this really is?
martiuk 3 hours ago
Around 2000 to over 7000 false positives per mm^2 based on the type of glove. Essentially, regular lab gloves shed enough particles to swamp microplastic measurements to warrant switching to clean room gloves for this type of analysis.
replyginko 2 hours ago
Shouldn't any lab analysis have control samples to detect environment contamination like this?
replyAlpinMouton 31 minutes ago
It's difficult to avoid contamination, since everything (samples, containers, equipements, etc) will have been in contact with glove at least once, and good decontamination is very hard.
replyfeverzsj 2 hours ago
Now, I'm worried about people preparing my food with gloves.
replyjanderson215 52 minutes ago
“Are you wearing gloves? That’s disgusting. Use your bare hands, you animal.”
reply
1. A whole cohort of core studies have been judged to have invalid methodology due to not recording baseline microplastic levels (https://www.pnas.org/doi/10.1073/pnas.2411099121)
2. Young-onset cancers (especially colorectal cancer) which were inferred to be caused by a rise in microplastics are being linked explicitly to other mechanisms and cohorts. (https://ascopubs.org/doi/10.1200/JCO.2025.43.16_suppl.3619)
The PNAS paper is a pretty good critique of contamination/baseline issues, and I agree some of the “microplastics are causing young-onset cancer” claims got ahead of the evidence.
But the broader concern still exists: people are clearly exposed constantly, particles are being found in human tissue, and there are plausible mechanisms for harm. So no, there is not "much less to worry".
Also - in terms of human tissue:
"The problem is that some small molecules in the fumes derived from polyethylene and PVC can also be produced from fats in human tissue. Human samples are “digested” with chemicals to remove tissue before analysis, but if some remains the result can be false positives for MNPs. Rauert’s paper lists 18 studies that did not include consideration of the risk of such false positives." (https://www.theguardian.com/environment/2026/jan/13/micropla...)
and Rauert's paper (https://pubs.acs.org/doi/10.1021/acs.est.4c12599)