ON PHOTOCHEMISTRY OF AQUEOUS NITRATE SOLUTIONS EXCITED IN 195-NM BAND

被引：72

作者：

SHUALI, U

OTTOLENG.M

RABANI, J

YELIN, Z

机构：

[1] Department of Physical Chemistry, Hebrew University, Jerusalem

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1969年 / 73卷 / 10期

关键词：

D O I：

10.1021/j100844a052

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The photochemistry of aqueous nitrate solutions excited in the high-energy (195-nm) ππ* band of the ion is investigated using steady-state and flash-irradiation techniques. The formation of hydroxyl radicals is demonstrated by observing the absorption of characteristic transients formed by the reaction of OH (or O-) with CO32-, CNS-, and O2. The formation of pernitrite is also investigated and found to be unaffected by [NO2-], [NO3-], [O2], and [CH3CH2OH]. The flash technique enables the determination of the dissociation constant of pernitrous acid, yielding pKa = 6.0 ± 0.3. A third photochemical path, the evolution of O2 and the stoichiometric formation of NO2-, is also investigated. The effect of various solutes on the yields of molecular oxygen is analyzed. The results appear to be inconsistent with a mechanism involving intermediate oxygen atoms.

引用

页码：3445 / +

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