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- In organic chemistry, peroxyacyl nitrates (also known as Acyl peroxy nitrates, APN or PAN s) are powerful respiratory and eye irritants present in photochemical smog.
en.wikipedia.org/wiki/Peroxyacyl_nitrates
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In organic chemistry, peroxyacyl nitrates (also known as Acyl peroxy nitrates, APN or PANs) are powerful respiratory and eye irritants present in photochemical smog. They are nitrates produced in the thermal equilibrium between organic peroxy radicals by the gas -phase oxidation of a variety of volatile organic compounds (VOCs), or ...
Peroxyacetyl nitrate, or PAN, is an oxidant that is more stable than ozone. Hence, it is more capable of long-range transport than ozone. It serves as a carrier for oxides of nitrogen (NOx) into rural regions and causes ozone formation in the global troposphere. [1] Atmospheric chemistry.
過氧硝酸乙醯酯 （英語： Peroxyacetyl nitrate ）是一種 過氧醯基硝酸鹽 。 它是 光化學煙霧 中的二次 污染物 。 [1] 對熱不穩定，會分解成過氧乙醇自由基和 二氧化氮 氣體。 [2] 它是一種 催淚 物質，意味著會刺激肺部和眼睛。 [3] 過氧硝酸乙醯酯或是一種比 臭氧 更穩定的氧化劑。 因此它比臭氧更具有遠距離遷移能力。 它作為 氮氧化物 進入農村地區的載體，並在全球 對流層 中形成臭氧。 [1] 大氣化學 [ 編輯] 過氧硝酸乙醯酯是在大氣中通過 烴類 在 二氧化氮 存在下光化學氧化成 過氧乙酸 自由基產生的。 由於沒有直接排放，故屬於二次污染物。 僅次於 臭氧 和 過氧化氫 ，它是 光化學煙霧 的重要成分。 過氧硝酸乙醯酯是最重要的 過氧醯基硝酸鹽 。
過氧醯基硝酸鹽 （Peroxyacetyl Nitrates；PANs 或 Acyl peroxy nitrates；APNs），是 洛杉磯型煙霧 （ 光化學煙霧 ）中的主要二次污染成分之一。 它不是由人類活動或是自然活動所產生的直接排放物，而是在光的參與下，乙（某）醛與 氫氧自由基 通過氧氣生成過氧乙（某）醯基，再與 二氧化氮 反應製得。 它不僅是 光化學煙霧 中刺激眼睛的主要有害物，而且是造成皮膚癌的可能致變劑，還是植物的毒劑。 事實上，正是對光化學污染條件下 洛杉磯 聖蓋博谷 中農作物病變的研究直接導致了這種「新型」化合物的發現 [1] 。 特性 [ 編輯] PAN在大氣中的解離主要有 光解 和 熱解 兩種機制，在室溫條件下，PAN的壽命大約幾個小時。
Peroxyacyl nitrates or PANs, which are also referred to as acyl peroxy nitrates or APN, are a component of photochemical smog, produced in the atmosphere when oxidized volatile organic compounds combine with nitrogen dioxide ( \ceNO2 \ce N O 2 ). [2] Figure 1 shows the structure of an example of PAN.
2021年10月22日 · Elevated levels of anthropogenic volatile organic compounds (VOCs) and their oxidation products such as O 3 and peroxyacyl nitrates (PANs) indicate the impacts of urban and Oil and Natural Gas (O&NG) emissions. Photochemistry in the Yellow River Delta is investigated in detail using in situ chemical measurements and 0-D box model simulations.
Peroxyacyl nitrates (PANs) are important organic indicators of tropospheric chemical processes. In this chapter, our current understanding of the chemical and physical properties of PANs are reviewed. After a brief discussion of the discovery of peroxyacetyl nitrate (PAN), their synthesis and physical and chemical properties are examined.
