Bluetreefrog

Abstract

Many “smart” and “fitness” watch bands are advertised to contain fluoroelastomers, a type of synthetic rubber designed to be resilient against skin oils and sweat. Fluoroelastomers, which are considered a polymeric form of per- and polyfluoroalkyl substances (PFAS), have historically involved the use of shorter-chain PFAS as surfactants in the polymerization process. In this study, 22 watch bands were analyzed across numerous brands and price points for the presence of PFAS. Products were first screened for total fluorine using particle-induced gamma-ray emission spectroscopy on the surface of these bands, and 15 of the 22 watch bands contained total F concentrations >1% fluorine, suggesting the widespread use of fluoroelastomers in this product category. Watch bands then underwent solvent extraction and targeted LC-MS/MS analysis for 20 PFAS. Perfluorohexanoic acid (PFHxA) was the most frequently detected compound with concentrations from <LoD to 16662 ng/g. A subset of six watch bands also underwent direct total oxidative precursor (dTOP) assay to determine the presence of PFAS precursors. The very high concentrations of PFHxA readily extractable from the surfaces of fluoroelastomer watch bands, together with the current limited knowledge on the dermal absorption of PFHxA, demonstrate the need for more comprehensive exposure studies of PFHxA.

Hi Everyone,

We are looking for another person to help out moderating AskLemmy. Home instance does not matter, and Accounts will need to have a history of positive contribution to Lemmy.

DM or reach out via Matrix if interested.

I'm getting a bit sick of large corporations a) demanding excess data as a condition of doing business with me, b) allowing it to be stolen, and c) giving zero fucks about it.

What are some things that us netizens can do to make our displeasure known.

Extra points for funny ideas.

It's been over a month since the temporary ban on US Politics was implemented in AskLemmy. This post is a poll to see if the community wants it made permanent, or removed.

Vote by upvoting the comment below for "Yes", or downvoting for "No".

The poll will close a few hours before midnight Sunday, UTC time.

Is there a mod and admin only matrix room that we can use to discuss modding? I'm aware of Lemmy.World General and Lemmy.World DEFENCE, but I don't think either of these is what I'm looking for.

I did this on Firefox, but I suspect it may work in other browers too.

1. Install the Violentmonkey extension. Tampermonkey or Greasemonkey will also do.
2. Install the Lemmy tools script.
3. Browse to Lemmy
4. Click on the screw driver icon on the LemmyTools bar that is now visible on the Lemmy page.
5. Scroll down and check the box next to "Content Blocking"
6. Add your block words in the "Add filters seperated by commas." box. I typed "Trump, Vance" Voila!

I'm wondering how hard it would be to write a firefox extension that blocked individual Lemmy posts based on the presence of words in a block list.

I'm pretty famiiar with Python, but have only done a little bit of hacking of JS, so was hoping the brains trust could provide some insight.

Why is it so good?

It was started by one of the grandfathers of computing/the web/the internet, but I'll be damned if I can remember what it was called and my DuckDuckGo-Foo is failing me today.