表层土壤中菲的紫外光降解研究

多环芳烃化合物（PAHs）由于致癌、致畸和致突变而受到广泛关注。本实验以多环芳烃菲（Phe）为目标污染物，研究了温度、腐植酸和紫外辐射强度对Phe光降解的影响并对不同因素对降解动力学的影响作了研究。结果表明，Phe的降解在20 ℃到30 ℃范围内，随着温度的升高，光降解率增加；腐植酸在Phe污染土壤的光降解中起敏化作用，可显著促进光解，腐植酸浓度为5 mg·kg^-1足以达到敏化的效果；Phe光降解速率常数随辐射强度的降低而降低，呈正相关，光解的半衰期随着辐射强度的降低而增加，呈负相关。

The Photodegradation of Phenanthrene on Soil Surface Under UV Light

Polycyclic aromatic hydrocarbons （PAHs） are a group of major contaminants that are ubiquitous in the environment due to their toxicity, mutagenicity and c arcinogenicity. This paper studied the soil borne PAHs photodegradation under UV irradiation with phenanthrene（Phe） as target contaminants. The effects of temperature, humic acids （HA） and the intensity of UV irradiation on the Phe photodegradation were investigated. The dynamics of photodegradation of Phe were studied under different conditions. The results show that the rate of Phe photodegradation increases when the temperature rises from 20 ℃ to 30 ℃. The HA played a sensitivizing role during the Phe photodegradation. When the HA concentration was 5 mg·kg^-1, HA could efficiently sensitivize the Phe photodegradation. The rate of photodegradation decreases with the decreasing UV irradiation intensity, correlated positively. The half-life increases with the decreasing UV irradiation intensity, correlated negatively.