硝酸ベリリウム

危険有害性情報のコード(GHS)

• 絵表示(GHS)

  

• 注意喚起語

  Danger

• 危険有害性情報

  H272：火災助長のおそれ；酸化性物質

  H301：飲み込むと有毒

  H315：皮膚刺激

  H317：アレルギー性皮膚反応を起こすおそれ

  H319：強い眼刺激

  H331：吸入すると有毒

  H334：吸入するとアレルギー、喘息または、呼吸困難 を起こすおそれ

  H335：呼吸器への刺激のおそれ

  H372：長期にわたる、または反復暴露により臓器の障 害

  H373：長期にわたる、または反復暴露により臓器の障 害のおそれ

  H411：長期的影響により水生生物に毒性

• 注意書き

  P201：使用前に取扱説明書を入手すること。

  P220：衣類/．．．/可燃物から遠ざけること。

  P261：粉じん/煙/ガス/ミスト/蒸気/スプレーの吸入を避ける こと。

  P273：環境への放出を避けること。

  P280：保護手袋/保護衣/保護眼鏡/保護面を着用するこ と。

  P301+P310：飲み込んだ場合：直ちに医師に連絡すること。

  P305+P351+P338：眼に入った場合：水で数分間注意深く洗うこと。次にコ ンタクトレンズを着用していて容易に外せる場合は外す こと。その後も洗浄を続けること。

  P311：医師に連絡すること。

硝酸ベリリウム 化学特性,用途語,生産方法

• 解説

  硝酸ベリリウム,三水和物は無色，あるいは，かすかに黄色を帯びた結晶．密度1.59 g cm－3．融点60 ℃．100 ℃ で分解して2Be(NO3)2･BeOを生じ，無水物は得られない．潮解性で，水，エタノールに易溶，アセトンに不溶．発光しやすい．

  森北出版「化学辞典（第2版）
  

• 用途

  白熱灯の酸化ベリリウム導入剤に用いられる．

• 製造

  硝酸ベリリウム,炭酸ベリリウムまたは水酸化ベリリウムを硝酸に溶かして濃縮すると三水和物が得られる．

• 説明

  Beryllium nitrate is said to have the molecular formula of Be(NO3)2 and the molecular weight of grams per mole. It is very soluble in water.
  It could be prepared by the action of nitric acid on beryllium carbonate, oxide or hydroxide:
  BeCO3 + 2HNO3 ? Be(NO3)2 + CO2 +H2O
  Be(OH)2 + 2HNO3 ? Be(NO3)2 + 2H2O
  It is described as Be(NO3)2·4H2O, a compound that forms colorless, deliquescent crystals that are soluble in water, and used to introduce beryllium oxide into materials used in incandescent mantles. However, in view of recent developments concerning the behavior of the Be³⁺ cation in solution, the more likely reactions are:
  BeCO3 + 2HNO3 ? Be(OH)NO3 + CO2 + 1/2H2O
  Be(OH)2 + 2HNO3 ? Be(OH)NO3 + 3/2H2O

• 化学的特性

  White to faintly yellowish, deliquescent mass. Soluble in water, alcohol.

• 物理的性質

  DTA analysis of the tetrahydrate showed that it dissolves in its own waters of hydration at about 60.4°C. Heating above 101°C causes decomposition with loss of water and oxides of nitrogen plus formation of the oxide. The decomposition is complete at 250°C. Thermal decomposition of these salt hydrates occurs by release of nitric acid which then breaks down to form the nitrogen oxides, rather than break down of the nitrate anion itself. The anhydrate has been prepared by the reaction of beryllium chloride with N2O4 dissolved in ethylacetate. If heated in a vacuum above 50°C, the product, Be(NO3)2·2N2O4, evolves oxides of nitrogen to produce the anhydrate.
  The tetrahydrate has a CAS number of 13597-99-4 and molecular weight is grams per mole. Anhydrous beryllium nitrate is a white to pale yellow crystalline solid. Beryllium nitrate trihydrate (CAS number = 7787-55-5) forms slightly yellow crystals with a vapor pressure 49.8 mm Hg at 25°C. Its melting point is 60.5°C and it decomposes completely at 102.3°C. Its Enthalpy of vaporization = 37.72 kJ/mol and its boiling point is 83°C at 760 mm Hg where it becomes anhydrous. Beryllium nitrate is a tumorigen, mutagen and reproductive effector in rats and, presumably in humans.
  Beryllium metal dissolves readily in nonoxidizing acids such as HCl and H2SO4, but not in nitric acid as this forms the oxide (this behavior is similar to that of aluminum metal). Beryllium, again similarly to aluminum, dissolves in warm alkali to form the beryllate anion, Be(OH)4^2-, and hydrogen gas.

• 使用

  Beryllium nitrate is used as a hardening agent for mantles on gas lanterns.

• 製造方法

  Anhydrous beryllium nitrate has been prepared by the reaction of anhydrous beryllium chloride with an ethylacetate-dinitrogen tetroxide mixture to give Be(NO3)2 · 2N2O4 [Addison and Walker 1963]. When heated above 50 °C (120 °F) in a vacuum, oxides of nitrogen are evolved, leaving anhydrous beryllium nitrate. The anhydrous salt is stable to approximately 125 °C (255 °F), when a sudden decomposition occurs to give nitrogen tetroxide and a volatile compound that separates from the gas phase as colorless Be4O(NO3)6 crystals. These crystals are slowly hydrolyzed when added to water.

• 危険性

  Beryllium nitrate is a toxic chemical,like all other beryllium compounds. It is also an irritant in small doses. When burned, it gives off irritating or toxic fumes. However, when massive short-term exposure occurs, acute pneumonitis can set in, but symptoms do not manifest themselves for 3 days.

• 安全性プロファイル

  Confirmed carcinogen. Poison byintraperitoneal, intravenous, and subcutaneous routes.Experimental reproductive effects. When heated todecomposition it emits very toxic fumes of BeO and NOx.

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13597-99-4, 硝酸ベリリウム キーワード