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Diatomaceous earth filtration is a special filtration process that removes particles from liquids as it passes through a layer of fossilized remains of microscopic water organism called diatoms. These diatoms are mined from diatomite deposits which are located along the Earth's surface as they have accumulated in sediment of open and moving ...
Diatomite rock sample from Sisquoc Formation Scanning electron micrograph of diatomaceous earth. Diatomaceous earth (/ ˌ d aɪ. ə t ə ˈ m eɪ ʃ ə s / DY-ə-tə-MAY-shəs), also known as diatomite (/ d aɪ ˈ æ t ə m aɪ t / dy-AT-ə-myte), celite, or kieselguhr, is a naturally occurring, soft, siliceous sedimentary rock that can be crumbled into a fine white to off-white powder.
Diatomaceous earth can also be used as a home flea treatment in lieu of acetylcholinesterase inhibitory treatments or insecticides which carry with them a risk of poisoning for both humans and other animals. However, diatomaceous earth dust is harmful to pets and people when inhaled, requiring use of a dust mask to apply. [8] [9]
Fuller's earth is the most common spelling today, but both fullers earth and fullers' earth remain in wide use. [4] Fuller's earth is also known by the following other names: Bleaching clay, [5] probably because fulling whitened the cloth. Whitening clay, particularly when used to treat facial pigmentation, such as melasma.
An insect growth regulator (IGR) is a chemical insecticide that kills insects indirectly by disrupting their life cycles. [1] The term was initially proposed to describe the effects of juvenile hormone analogs. [2]
Since some of its diatomites, along with those of the underlying Monterey Formation, are of unusual purity and extent, they can be mined as diatomaceous earth. France-based Imerys operates a mine in the Sisquoc and Monterey Formations in the hills south of Lompoc, California, the largest such operation in the world. [7] [8]
After its introduction, dynamite rapidly gained wide-scale use as a safe alternative to black powder and nitroglycerin. Nobel tightly controlled the patents, and unlicensed duplicating companies were quickly shut down. A few American businessmen got around the patent by using absorbents other than diatomaceous earth, such as resin. [4]
When diatoms die and their organic material decomposes, the frustules sink to the bottom of the aquatic environment. This remnant material is diatomite or "diatomaceous earth", and is used commercially as filters, mineral fillers, mechanical insecticide, in insulation material, anti-caking agents, as a fine abrasive, and other uses. [9]
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