Calcium hydroxide. Documentation
Journal Title: Podstawy i Metody Oceny Środowiska Pracy - Year 2013, Vol 29, Issue 3
Abstract
Calcium hydroxide (Ca(OH)[sub]2[/sub]), commonly known as slaked lime, is used to clean beet juice in the sugar industry, as a water softener, in fertilizer production and in flue gas desulphurisation in power. The term slaked lime (slaked lime) corresponds to an aqueous slurry of calcium hydroxide known as milk of lime. The aqueous slurry is used in chemical processes for painting and as a component of mortar. Hydrated lime, or dry powdered calcium hydroxide, is used to manufacture sodium carbonate by Solvay (Soda Ash), in deacidification of soils, disinfection, in bleach-ing households, farm buildings and tree trunks. Calcium hydroxide is an HPV substance. Calcium hydroxide is considered as a strong base, completely ionized in solution. Compared with the strong inorganic base, it has a similar effect, but 2.5-fold weaker. Mixtures of aqueous calcium hydroxide are strongly alkaline and its pH is, depending on the concentration, 12–13. Calcium hydroxide is corrosive after ingestion, especially in the esophagus and the stomach and causes redness, blisters and sores at the contact with the skin. Occupational exposure of workers to calcium hydroxide dusts takes place during the comminution of the substance, but also as a result of exposure to calcium oxide, which in humidity reacts with water to form calcium hydroxide. Particles of calcium hydroxide in humans are irritating to the eyes, upper respiratory tract and skin. In the available literature, there are no data about dose-response in humans and animals for calcium hydroxide. Given the similarities in the action of the oxide and calcium hydroxide, it was proposed to maintain the current value of TWA for inhalable fraction of calcium hydroxide 2 mg/m[sup]3[/sup] and adopt STEL of 6 mg/m[sup]3[/sup], and for respirable fraction of 1 mg/m3 for TWA and STEL of 4 mg/m[sup]3[/sup].
Authors and Affiliations
Małgorzata Kupczewska-Dobecka
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Calcium hydroxide. Documentation
Calcium hydroxide (Ca(OH)[sub]2[/sub]), commonly known as slaked lime, is used to clean beet juice in the sugar industry, as a water softener, in fertilizer production and in flue gas desulphurisation in power. The term...
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