[Stoves] ***SPAM*** Re: ***SPAM*** RE: Stoves Digest, Vol 93, Issue 5

[Xavier Brandao]

Dear Philip, Crispin,

 

Actually what I read online about ultrafine particles (on a few French articles) is that the fact they are small make them more likely to penetrate the body, be retained by the tissues, and go into the blood. And paradoxically, they are potentially more toxic than bigger particles, precisely because they are small. The active substances are at their surface, so it is the surface, not the mass, that counts in the toxicity.

 

I read also that their effect on health is not well-known, but potentially toxic.

https://en.wikipedia.org/wiki/Ultrafine_particle 

 

So again, more science on the question is necessary, but I would understand if measures are taken now to prevent emissions of ultrafine particles, as well as exposure.

 

Best,

 

Xavier

 

 

 

De : Stoves [mailto:stoves-bounces at lists.bioenergylists.org] De la part de plloyd at mweb.co.za
Envoyé : mercredi 9 mai 2018 20:00
À : Discussion of biomass cooking stoves
Objet : [Stoves] ***SPAM*** Re: ***SPAM*** RE: Stoves Digest, Vol 93, Issue 5

 

Confirm. Around 0.4 microns, retention in the lungs is very low, not really measurable. Philip

Sent from my Huawei Mobile



-------- Original Message --------
Subject: [Stoves] ***SPAM*** RE: Stoves Digest, Vol 93, Issue 5
From: Crispin Pemberton-Pigott 
To: Discussion of biomass cooking stoves 
CC: 




Dear Norbert

 

I defer to Profs Harold Annegarn and Philip Lloyd on this matter of inhalation, but I understand from them that below a certain aerodynamic diameter, particles are too small to be impacted and stick in the lungs, and only enter the body by diffusion, like gases. Small particles are inhaled and exhaled again. 

 

Regards

Crispin 

 



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