危險性描述R12;R26;R48/20;R50/53理化性質(zhì):熔點:-116℃沸點:-62℃閃點:-110℃密度:4.93kg/m3臨界溫度:99.95℃臨界壓力:6.55MPa爆炸上限(V/V):100%爆炸下限(V/V):4.5%飽和蒸氣壓:1463kPa(20℃)外觀:無色氣體溶解性:微溶于水 [5],微溶于乙醇、堿液,溶于苯、氯仿 [1]。穩(wěn)定性:AsH3的生成熱為正值,這說明它在熱力學(xué)上是不穩(wěn)定的,一般在250-300℃就分解為相應(yīng)的元素。然而它在室溫下分解緩慢,說明在動力學(xué)上還有一定的穩(wěn)定性。AsH3的分解是一級反應(yīng)。將AsH3和AsD3的混合物分解可得到HD,但AsH3和D2的混合物的分解就得不到HD,交換只發(fā)生在與As成鍵的H上。這也證明砷不能直接與氫氣反應(yīng)生成AsH3。 [5]結(jié)構(gòu):AsH3的給電子能力,很差,很難與質(zhì)子形成砷鹽,只與少數(shù)Lewis酸形成配位化合物。在AsH3中,鍵角H-As-H為91.8°,接近于90°,表明As原子幾乎是用純凈的p軌道成鍵,孤電子對占有s軌道,這可以解釋為什么AsH3的配體性質(zhì)很弱。安全信息:安全術(shù)語S9:Keep container in a well-ventilated place.保持容器在通風(fēng)良好的場所。S16:Keep away from sources of ignition - No smoking.遠離火源,禁止吸煙。S28:After contact with skin, wash immediately with plenty of ... (to be specified by the manufacturer).皮膚接觸后,立即用大量...(由生產(chǎn)廠家)沖洗。S33:Take precautionary measures against static discharges.對靜電采取預(yù)防措施。S36/37:Wear suitable protective clothing and gloves.穿戴適當(dāng)?shù)姆雷o服和手套。S45:In case of accident or if you feel unwell, seek medical advice immediately (show the lable where possible).發(fā)生事故時或感覺不適時,立即求醫(yī)(可能時出示標(biāo)簽)。S60:This material and/or its container must be disposed of as hazardous waste.該物質(zhì)及其容器必須作為危險廢物處置。S61: Avoid release to the environment. Refer to special instructions/Safety data sheets.避免釋放到環(huán)境中,參考特別指示/安全說明書。