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利用激光闪光光解瞬态吸收光谱及气相色谱-质谱联用(GC-MS)技术分别对HNO2与联苯水溶液经紫外光照射后发生的交叉反应的机理及最终产物进行了研究.结果表明,HNO2受355nm紫外光激发产生的·OH能够快速加合至联苯的苯环上形成Bp-OH加合物,其二级反应速率常数为9.5×109 L·mol-1·s-1.从动力学角度验证该加合物能够与H+发生反应,亦可被HNO2氧化为亚硝基联苯酚.故大气水体中的HNO2与联苯在紫外光照射下发生的交叉反应可能是环境中硝基化合物的来源之一.
The mechanism of cross-reaction of HNO2 with biphenyl aqueous solution after UV irradiation and the final product were studied by laser flash photolysis transient absorption spectroscopy and gas chromatography-mass spectrometry (GC-MS) HNO2 excited by 355nm UV light can quickly adduct to the benzene ring of biphenyl to form Bp-OH adduct, the second-order reaction rate constant is 9.5 × 109 L · mol-1 · s-1. From Kinetic analysis shows that the adduct can react with H + and can also be oxidized by HNO2 to nitroso-biphenol, so the cross-reaction between HNO2 and biphenyl in atmospheric water under UV irradiation may be the reaction of nitro One of the sources of the compound.