12 votes

Does orange essential oil create formaldehyde when exposed to ozone?

Yes, limonene is a terpene and terpenes react with ozone to form formaldehyde and other micro-particle pollutants. Limonene itself isn’t toxic and hasn’t been found to be harmful, but some people are ...
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  • 14k
8 votes
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What chemicals are used to replace BPA in plastics?

First of all, in many products BPA has not been replaced at all. It is still present in many types of food packaging, especially in canned foods. AFAIK the main exception is baby bottles which are ...
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  • 14k
5 votes
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Does polyethylene film (plastic bags) breakdown chemically?

Unless polyethylene has been pretreated during its manufacturing process it is a very obdurate material, being susceptible to degradation by oxidation and UV light. Degradation can occur with chlorine,...
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  • 3,152
4 votes
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Does decanting eliminate heavy metals in water?

Precipitation and decantation are two different things. If left alone, dissolved heavy metals would never go down to the bottom of a container (countering the gravity pull for an ion over 10 cm costs ...
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4 votes
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Chemicals From Pressure-Treated Wood

The danger is real enough for so-called "ground contact" applications, such as in your garden case. Over time, the constant exposure to moisture leaches out the chemicals from the lumber and into the ...
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  • 477
3 votes
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Are aluminum sheets appropriate for rainwater catchment roof?

You've raised a few issues in your posts, so having just built a new house I'll address those I'm able to: To start with, I live in a country/area where corrugated steel roofing is the absolute norm ...
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3 votes

How do you decontaminate land?

What you're seeing: biopiles it looks like companies just dig the ground, leave everything in a pile for a while (few weeks?) and then bring over the dirt elsewhere. It sounds like what you're ...
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2 votes
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Is mercury still found in modern e-waste?

The usage of mercury in electronics devices that end up producing e-waste is small but present in some components. Though not widely used now, cathode ray tube (CRT) monitors contain mercury as do ...
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  • 3,152
2 votes
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Do Chipotle style bowls still have PFAS chemicals?

From the the article you referenced, Chipotle is quoted as saying (emphasis added): We’ve been working closely with our suppliers to develop new food packaging that is sustainably sourced, functional,...
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2 votes
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What chemicals does copper slag release into the soil or water table when it is recycled as a gravel?

I found a (eventually political) study made by NABU Hamburg from 2013 about copper slag. They state, that several materials are included with toxic and hazardous to health impact, among others (per ...
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  • 929
2 votes

How can I easily detect the presence of insecticides?

If you have a particular location in the room where you suspect they may have been used, you could try releasing some live bugs there (ones that are moderately welcome indoors), eg some jumpy spiders. ...
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2 votes

Alternatives to Naphthalene

As I understand the smell is the problem. The naphthelene masks the smell but it too is a problem. So the issue is "How to reduce the smell" One answer is to cover it up. Anotehr answer is to ...
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1 vote

Are aluminum sheets appropriate for rainwater catchment roof?

As it turns there are several solutions. And as I've discovered, the headline is: aluminum is probably fine. HOWEVER ... in my case I think it will be cost-prohibitive, since a 4x8 sheet costs ~$100. ...
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1 vote

How safe is it to manufacture and use silicone?

http://globalsilicones.org ----- /sustainability/ and /silicones-chemistry/ 'Alot has to do with type of silicone. All silicones are sensitive to uv light and will break down eventually. Some ...
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