humic substances are organic compounds that are important components of humus, the major organic fraction of soil, peat, and coal. for a long era in the 19th and 20th centuries, humic substances were often viewed through a lens of acid–base theory that described humic acids, as organic acids, and their conjugate bases, humates, as important components of organic matter. through this viewpoint humic acids were defined as organic substances extracted from soil that coagulate when a strong .
since about 1990, there has been a resurgence of the promotion of colloidal silver as a dietary supplement, marketed with claims of it being an essential mineral supplement, or that it can prevent or treat numerous diseases, such as cancer, diabetes, arthritis, hiv/aids, herpes, and tuberculosis.
when the ph of acid mine drainage is raised past 3, either through contact with fresh water or neutralizing minerals, previously soluble iron iii ions precipitate as iron iii hydroxide, a yellow-orange solid colloquially known as yellow boy. other types of iron precipitates are possible, including iron oxides and oxyhydroxides.
sodium monofluorophosphate, commonly abbreviated mfp, is an inorganic compound with the chemical formula na 2 po 3 f. typical for a salt, mfp is odourless, colourless, and water-soluble. this salt is an ingredient in some toothpastes. 2.1 chemistry of decay. 2.2 chemistry of enamel fluoridation. 3 preparation and structure.
live blood analysis lba , live cell analysis, hemaview or nutritional blood analysis is the use of high-resolution dark field microscopy to observe live blood cells. live blood analysis is promoted by some alternative medicine practitioners, who assert that it can diagnose a range of diseases.
the mineral material from which a soil forms is called parent material. rock, whether its origin is igneous, sedimentary, or metamorphic, is the source of all soil mineral materials and the origin of all plant nutrients with the exceptions of nitrogen, hydrogen and carbon. as the parent material is chemically and physically weathered .
ferrihydrite fh is a widespread hydrous ferric oxyhydroxide mineral at the earth's surface, and a likely constituent in extraterrestrial materials. it forms in several types of environments, from freshwater to marine systems, aquifers to hydrothermal hot springs and scales, soils, and areas affected by mining.
palladium is found in the rare minerals cooperite and polarite. many more pd minerals are known, but all of them are very rare. palladium is also produced in nuclear fission reactors and can be extracted from spent nuclear fuel see synthesis of precious metals , though this source for palladium is not used.
it occurs naturally in the minerals leucite, pollucite, carnallite, and zinnwaldite, which contain as much as 1% rubidium oxide. lepidolite contains between 0.3% and 3.5% rubidium, and is the commercial source of the element. some potassium minerals and potassium chlorides also contain the element in commercially significant quantities.
silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula sio2, most commonly found in nature as quartz and in various living organisms. in many parts of the world, silica is the major constituent of sand. silica is one of the most complex and most abundant families of materials, existing as a compound of several minerals and as synthetic product. notable examples include fused quartz, fumed silica, silica gel, and aerogels. it is used in structural materials, micro
photogeochemistry merges photochemistry and geochemistry into the study of light-induced chemical reactions that occur or may occur among natural components of earth's surface. the first comprehensive review on the subject was published in 2017 by the chemist and soil scientist timothy a doane, but the term photogeochemistry appeared a few years earlier as a keyword in studies that described .
bulk minerals with a reference daily intake rdi, formerly recommended daily allowance rda of more than 200 mg/day are calcium, magnesium, and potassium while important trace minerals rdi less than 200 mg/day are copper, iron, and zinc. these are found in many foods, but can also be taken in dietary supplements.