white alkali

white alkali
Alkali soil Alkali soil Any one of various soils found in arid and semiarid regions, containing an unusual amount of soluble mineral salts which effloresce in the form of a powder or crust (usually white) in dry weather following rains or irrigation. The basis of these salts is mainly soda with a smaller amount of potash, and usually a little lime and magnesia. Two main classes of alkali are commonly distinguished: {black alkali}, which may be any alkaline carbonate, but which practically consists of sodium carbonate (sal soda), which is highly corrosive and destructive to vegetation; and {white alkali}, characterized by the presence of sodium sulphate (Glauber's salt), which is less injurious to vegetation. Black alkali is so called because water containing it dissolves humus, forming a dark-colored solution which, when it collects in puddles and evaporates, produces characteristic black spots. [Webster 1913 Suppl.]

The Collaborative International Dictionary of English. 2000.

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  • white alkali — n. 1. refined soda ash 2. the white crust formed on some alkali soils, consisting of a mixture of sodium and magnesium sulfates and sodium chloride …   English World dictionary

  • white alkali — noun 1. : a mixture of salts (as sodium sulfate, magnesium sulfate, and sodium chloride) forming a white crust on some alkali soils 2. : refined soda ash * * * 1. Agric. a whitish layer of mineral salts, esp. sodium sulfate, sodium chloride, and… …   Useful english dictionary

  • white alkali — 1. Agric. a whitish layer of mineral salts, esp. sodium sulfate, sodium chloride, and magnesium sulfate, often occurring on top of soils where rainfall is low. 2. refined soda ash. * * * …   Universalium

  • white alkali — /waɪt ˈælkəlaɪ/ (say wuyt alkuhluy) noun a whitish layer of mineral salts, especially sodium sulphate, sodium chloride, and magnesium sulphate, often found on top of soils under low rainfall …  

  • Alkali soil — Any one of various soils found in arid and semiarid regions, containing an unusual amount of soluble mineral salts which effloresce in the form of a powder or crust (usually white) in dry weather following rains or irrigation. The basis of these… …   The Collaborative International Dictionary of English

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  • White Sands National Monument — Gipsdüne …   Deutsch Wikipedia

  • black alkali — Alkali soil Alkali soil Any one of various soils found in arid and semiarid regions, containing an unusual amount of soluble mineral salts which effloresce in the form of a powder or crust (usually white) in dry weather following rains or… …   The Collaborative International Dictionary of English

  • White Sands National Monument — Infobox protected area name = White Sands National Monument iucn category = III caption = locator x = 90 locator y = 120 location = Otero County Dona Ana County, New Mexico, USA nearest city = Alamogordo, NM lat degrees = 32 lat minutes = 46 lat… …   Wikipedia

  • alkali metal — UK / US noun [countable] Word forms alkali metal : singular alkali metal plural alkali metals chemistry a soft, white metal that is a chemical element. Lithium, sodium, and potassium are alkali metals …   English dictionary

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