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Is Apatite a safe material to be used on air purifier filters?
I learned that the Sharp air purifiers' HEPA filters have an Apatite component to it that apparently provides antibacterial properties to protect the filters from microbial accumulation. Is Apatite a relatively "safe" material to use for an air filter, i.e. is it safe for the resident who is breathing air that comes through the filter? Apatite (a very general term) is usually made up of phosphorus and calcium, but some variants (ie. arsenates like mimemite) may contain arsenic. Could this be a health issue for users? Would the filters use arsenic-based variants in the first place, or are other forms more prevalent and likely to be used in medical/industrial applications?

Apatite is a group name for hexagonal or pseudohexagonal monoclinic arsenates, phosphates and vanadates. In general use 'apatite' is often used in particular for the Calcium Phosphate minerals, Fluorapatite, Chlorapatite and Hydroxylapatite. There is no specific data on health dangers or toxicity for this mineral. It is unlikely that an arsenate would be used in this application. The other forms are quite prevalent and more of these are actually mined as ore.
dakina1  |  Read more

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How is static electricity used in air purifiers and to control pollution in industrial smokestacks?
i was just wondering, since my friend asked me this and we both don't know

Pollutant particles are given an electrical charge and so collect on positively charged plates which can later by cleaned.
Dan S  |  Read more

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Do home air cleaners work for air pollution (such as car emmisions) as well as dander/pollen/allergens?
I've already read that many popular air purifiers actually emitt a lot of ozone, but for the ones that do not, do they work against city air pollution that comes from industrial work or is it just against organic allergens?

I believe it depends on what brand and which filter you buy. Each one uses a different method of filtration and some have combinations of several methods in the same purifier. Here are three different ones I found (the links are below). The Sharper Image Hybrid GP Germicidal Air Purifier reduces bacteria, mold spores and viruses in the air, and converts ozone to oxygen. The Friedrich C-90A Electronic Air Cleaner employs three different levels of allergen and irritant removal and claims to remove tobacco smoke, pollen, and dust. The AllerAir Air Purifiers help clean the air of particles, gases, odors, smoke, mold, and various pollutants. It claims to be ideal for someone who "wants features commonly ordered for use in hostile or toxic air environments such as medical facilities or government military buildings in order to reduce potent airborne contaminants."
Laurie F  |  Read more

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Is Apatite a safe material to be used on air purifier filters?
I learned that the Sharp air purifiers' HEPA filters have an Apatite component to it that apparently provides antibacterial properties to protect the filters from microbial accumulation. Is Apatite a relatively "safe" material to use for an air filter, i.e. is it safe for the resident who is breathing air that comes through the filter? Apatite (a very general term) is usually made up of phosphorus and calcium, but some variants (ie. arsenates like mimemite) may contain arsenic. Could this be a health issue for users? Would the filters use arsenic-based variants in the first place, or are other forms more prevalent and likely to be used in medical/industrial applications? Thanks, UK Export. So, from my understanding, most of the apatite used in industrial/consumer applications is manufactured or refined (to remove impurities like As), is that correct? Which are some of the companies who sell synthesized/refined apatite? What about the mined apatite? Are they used for anything other than for decorative/esthetic gemstones? Thanks again.

There is no danger at all. The apatite used will be a synthetically produced, very pure type unlike the mined variety which may contain other trace elements. Apatite is a very stable chemical and will not break down to its component elements under the sort of conditions existing in air filters.
U.K.Export  |  Read more

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