Posted on 11/04/2001 11:04:07 PM PST by BlackJack
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Would need to have an FDA test I am sure , that should only take 2 to 5 years!
It looks like standard HEPA filters can catch the spores, but I'm not sure what kills them. Titanium dioxide sounds like the stuff you put on your nose to prevent sunburn.
VOL.: 47 (1989) (p. 307)
CAS Nos.: 13463-67-7 - Titanium dioxide; 1317-70-0 - Anatase titanium dioxide; 1317-80-2 - Rutile titanium dioxide
Chem. Abstr. Name: Titanium dioxide
5. Summary of Data Reported and Evaluation
5.1 Exposures
Titanium dioxide is a white pigment produced mainly from ilmenite (iron titanate) and natural rutile (titanium dioxide). It is widely used in paints, paper, plastics, ceramics, rubber, inks and a variety of other products. Occupational exposure to titanium dioxide during its production, the production of paints, in painting trades and during other industrial use is likely to be extensive, but there is a paucity of data on levels, both occupational and environmental.
5.2 Experimental carcinogenicity data
Titanium dioxide was tested for carcinogenicity by oral administration in one strain of mice and in one strain of rats, by inhalation in two strains of rats, by intratracheal administration in one strain of hamsters, by subcutaneous injection in one strain of rats and by intraperitoneal administration in one strain of male mice and two strains of female rats. Increased incidences of lung adenomas in rats of both sexes and of cystic keratinizing lesions diagnosed as squamous-cell carcinomas in female rats were observed in animals that had inhaled the high but not the low doses of titanium dioxide. Oral, subcutaneous, intratracheal and intraperitoneal administration did not produce a significant increase in the frequency of any type of tumour in any species. Intratracheal administration of titanium dioxide in combination with benzo[a]pyrene to hamsters resulted in an increase in the incidence of benign and malignant tumours of the larynx, trachea andlungs over that in benzo[a]pyrene-treated controls.
5.3 Human carcinogenicity data
The only available epidemiological studyprovided inconclusive results.
5.4 Other relevant data
Titanium dioxide did not induce morphological transformation in mammalian cells or mutation in bacteria.
5.5 Evaluation
There is inadequate evidence for the carcinogenicity of titanium dioxide in humans. There is limited evidence for the carcinogenicity of titanium dioxide in experimental animals. Overall evaluation
Titanium dioxide is not classifiable as to its carcinogenicity to humans (Group 3).
I think that's zinc oxide...:)
Yes, you COULD use ZnO paste on your nose- but what I like to do in Hawaii is to get one of those nifty little umbrellas from my drink ( of course I have to finish the drink first!), then duct-tape it to my nose. Works great, and is a great conversation-starter...
TiO2 is the white hiding pigment of choice in the paint industry. From what I understand, it's also used to color any of a number of consumer products, ranging from paper to food. Any time you see white, guess TiO2, and you're probably right.
??? Hydroxyl radical :OH ???
That would imply that the catalyst acts only on moisture in the air, stripping off one of the hydrogen atoms. I question whether the good doctor's been quoted correctly.
My guess would have been that the system generates oxygen free radicals or ozone, and not the hydroxyl radical. Whether that's the case or not, wouldn't an active ozone generator be better than this passive light-catalyst generator?
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