天然水中萘光转化作用的影响因素研究

研究了氙灯照射下萘在纯水以及天然松花江水中的光转化作用.考察了萘的初始浓度、光强、初始pH值和共存离子等因素对萘光转化作用的影响.结果表明:在纯水和江水中萘均可以发生光转化,并且萘在纯水中的光转化较江水中快.在纯水和江水中,萘的转化率均随其初始浓度的增加而降低；萘的转化率随光强的增加而增加；初始pH值对纯水中萘光转化的影响不明显,但强酸性条件促进了江水中萘的光转化,强碱性条件抑制了江水中萘的光转化；在纯水中,Fe2+和Fe3+促进了萘的光转化,而NO2-,NO3-和Mn2+对萘光转化的影响不明显,在江水中,Fe2+和Mn2+抑制了萘的光转化,而NO2-,NO3-和Fe3+对萘的光转化的影响不明显.

The impact factors of photoconversion of naphthalene in natural water

The photoconversion of naphthalene under Xenon lamp irradiation in distilled and Songhua River water was investigated,the impact of initial concentration of naphthalene,initial pH value,light intensity,coexisting ions on the photoconversion of naphthalene in distilled and river water was discussed.The results showed that:naphthalene could be photoconverted both in distilled and river water.Generally,the photoconversion rate of naphthalene in river water was slower than that in distilled water.The conversion rate of naphthalene decreased with the increasing of its initial concentration,and increased with the increasing of light intensity both in distilled and river water.Initial pH value had no obvious impact on the photoconversion of naphthalene in distilled water;but in river water,strong acidic conditions promoted the conversion of naphthalene,strong alkaline conditions inhibited the photoconversion of naphthalene.In distilled water,Fe2+ and Fe3+ promoted the photoconversion of naphthalene,while NO-2,NO-3 and Mn2+ had no obvious impact.In river water,Fe2+and Mn2+ inhibited the photoconversion of naphthalene,but NO-2,NO-3 and Fe3+ had no obvious impact.