| The crystals that are being replaced are flat, tabular, and hexagonal in outline but are now composed entirely of iron hydroxides. |
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| Nitrates are formed from reacting nitric acid with metal oxides, hydroxides, or carbonates. |
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| The functional groups of iron hydroxides may sequestrate some cations and anions. |
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| The separation of toxic metals in solution by precipitation in the form of hydroxides is a widely developed purification technique. |
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| Alum stone is a natural crystalline powder derived from alumina and alum shale, which are aluminium oxides and hydroxides. |
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| The layers of hydroxides are irregular and poorly crystallised and their structure is finely and concentrically laminar. |
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| The drainage water, saturated with iron hydroxides and humic acids, corrodes even a stainless steel and liquefy the belly. |
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| The gold, sometimes free, is associated with quartz veins and stringers accompanied locally by iron oxides and hydroxides, galena and pyrite. |
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| Most conventional whitening toothpastes use sodium or potassium hydroxides, also known as lye, which is considered a poison by the Food and Drug Administration. |
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| This material is principally composed of oxides and iron hydroxides and other metals. |
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| Over the last century, antacids were developed based on the hydroxides and carbonates of the group II and III metals, as well as the bicarbonates of the alkali metals. |
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| An alkali, such as caustic soda or limewater is then added and the metal hydroxides are precipitated. |
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| In a partial cross section of a tree fern that lived about 200 million years ago, blue chalcedony and orange iron oxides and hydroxides have replaced the original structures. |
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| As has already been mentioned, conventional processes for treating waste water in the surface finishing industry require the elimination of metal through the forming and precipitation of relatively insoluble metal hydroxides. |
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| The only chemical requirements for this process are that the metals be free of effluent and the pH high enough to ensure optimum precipitation with hydroxides. |
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| Manganese nodules are rock concretions on the sea bottom formed of concentric layers of iron and manganese hydroxides around a core. |
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| The surface of most metals consists of oxides and hydroxides in the presence of air. |
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| Neutralization with amines, ammonia, or alkali metal hydroxides makes them dispersible in water. |
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| Calcium, barium, and strontium all alkaline earth metals form soluble hydroxides that are strong bases but are less stable than the alkali hydroxides. |
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| Also Hydramax magnesium hydroxides and hydroxyl carbonates and Hydrax alumina hydrates ranging from 1-10 microns. |
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| The magnesium hydroxides studied and recommended as rubber chemicals in these references are precipitated reaction products. |
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| Monocrystalline grains consist mostly of oligoclase andesite plagioclase and subordinately of quartz, calcite, biotite, magnetite, iron hydroxides and microcline. |
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| Aluminum is a naturally occurring element that is found ubiquitously in the environment as silicates, oxides and hydroxides in combination with other elements such as sodium and fluorine, and as complexes with organic matter. |
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| Fixed alkalies, such as sodium and calcium hydroxides, are used in depilatories. |
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| Clay particles are composed of clay minerals, usually phyllosilicates, as well as non-clay material, such as iron and aluminum oxides and hydroxides, quartz, amorphous silica, carbonates and feldspar. |
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| Incompatibility with other substances: May react violently, with increased risk of fire and explosion, with strong oxidizers, Lewis or mineral acids, strong bases, alkali metals and their hydroxides. |
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| May polymerize with evolution of heat when in contact with highly active catalytic surfaces, such as anhydrous chlorides of iron, tin and aluminum, peroxides of iron and aluminum, and alkali metal hydroxides. |
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| Polymetallic nodules are composed of irregular concentric envelopes of oxides and hydroxides of iron and manganese, giving them a stromatolite-like structure. |
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| As complete neutralization was approached, aluminum could begin to precipitate as hydroxides and then combine with precipitated silica to form cation-deficient aluminosilicates. |
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| All hydroxides form at low temperatures and are found predominantly as weathering products, as, for example, from alteration in hydrothermal veins. |
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| A number of mucosal adjuvants such as aluminum hydroxides, Freund's adjuvant, cholera toxin, Escherichia coli heat-labile enterotoxin. |
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| Also Hydramax magnesium hydroxides and hydroxy carbonates and Hydrax alumina hydrates ranging from 1-10 microns. |
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| However, Arrhenius proposes that common minerals such as iron oxide hydroxides, manganates and iron-manganese phosphates are more likely candidates. |
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| Nanoadsorbents based on layered double hydroxides can be used in the purification of industrial and hospital wastewater due to their high adsorption capacity. |
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