101–110 of 184 posts
Earlier quoted context omitted.
https://newrepublic.com/article/86339/toxins-plastic-shampoo... is interesting.
Thanks for sharing, this should be required reading.
Earlier quoted context omitted.
“Simply put, unleaded fuel burns less smoothly than leaded and the toluene and benzene, which is added to the fuel to act as a lead substitute, burns to form what are called peroxides. Unfortunately peroxides are inherently unstable and explode, forming shock waves that cause detonation. This explains why engines designed to run on unleaded from the outset feature sophisticated knock sensors, which retard the ignitio…
Right, but that article goes on to talk about various non-lead substitutes you should add... I know why unleaded vs leaded, but there are substitutes for lead that are designed for use in classic cars but don't actually contain lead, that's what I was asking the difference of. Basically, why use actual lead in gas when lead substitute exists and is recommended for classic cars as an additive to unleaded fuel?
Earlier quoted context omitted.
Asbestos is still manufactured and sold in some countries. Crazy I know.
As it's a naturally occuring mineral, you can't avoid it completely. https://www.earthmagazine.org/article/asbestos-found-nevada-...
Earlier quoted context omitted.
As it's a naturally occuring mineral, you can't avoid it completely. https://www.earthmagazine.org/article/asbestos-found-nevada-...
> As it's a naturally occuring mineral, you can't avoid it completely Isn't that also true of Lead?
Earlier quoted context omitted.
> As it's a naturally occuring mineral, you can't avoid it completely Isn't that also true of Lead?
Only until we figure out how to transmute it to gold.
"Looking back, it seems insane. Bluntly put, we took a known poison and – for three quarters of a century – used it in machines that puffed it out in breathable form. Then we drove them millions of miles a day, all over the world, regularly dosing billions of people with the toxin." We are still doing just that, even though we are using milder poisons now.
General Aviation (private planes) are STILL spewing lead into the atmosphere. It's not like they don't have the money to fix it, they just don't care about the externalities.
Only the smallest private planes run on piston engines, whose owners don’t really have money to “fix it”, especially because FAA regulations for certification of new planes and engine designs make everything cost about 10x what it should.
Earlier quoted context omitted.
There is currently a strong effort to move away from leaded fuels, and multiple producers have been selected by the FAA to formulate and sell fuel blends that present the desired octane ratings and are proven safe. The fist certifications of such fuels is expected this year: https://www.faa.gov/nextgen/where_we_are_now/nextgen_update/...
From the linked article, it's nice to see they moderated to a "fuel formulation change + limited engine modifications" approach. It seems unwise, chemically speaking, to expect we'll be able to find a drop in replacement that's less toxic (vs creating something that we find out is toxic in another 50 years).
I don't think it's out of the question that improvements in refining technology has made it possible and economical enough to create a fuel with a high enough octane rating without resorting to TEL or other metal-organic additives. E.g. the Shell stuff that is being investigated by the FAA PAFI project is rumored to be based on super-alkylate + aromatics.
What is still a safe lead blood value? And is there any merit in "chelation" therapies, as advocated on health websites, like this one, [1]? [1] https://www.livestrong.com/article/199912-what-natural-herbs...
I guess chelation/elimination does work if the WHO writes about it.
AFAIK lead is also stored in bones and probably within body tissues, so this might take a while.
Earlier quoted context omitted.
There is not, insofar as lead tends to be either inspired or ingested in contaminated water. For most people, it's the former. The "oral chelators" just bind lead that is mixed in with them, stopping you from absorbing as much of it. That is, Senapati 2001 (the garlic-rat study) didn't give lead acetate in the morning and garlic in the afternoon; they intentionally mixed the two together. That is, oral intake of lead…
Just adding to your comment. Govt regulation for lead workers where I worked was about 1.4 micro mols of lead.
Earlier quoted context omitted.
What are the poisons of today that we allow? I general, from what I've gathered, we have been replacing substances that accumulates in nature with substances that breaks down over time. So for instance, we still do allow ozone but also watch the levels to ensure they aren't too high. I know there are issues with a lot of medication as it goes out in the sewage and there's still a big question mark on the safety of so…
long-chain perfluorinated chemicals (C8 , involved in the production of teflon) see https://theintercept.com/2015/08/11/dupont-chemistry-decepti... Nictonoides in general (pesticides) are poisons, which we don't ingest directly but still spew in the environment. A poison we monitor and accumulates in the environment but don't regulate to the level it deserve given the damage it causes is of course CO2, as well as the…