Photolytic behavior of polycyclic aromatic hydrocarbons in diesel particulate matter deposited on the ground.
Photolytic behavior of polycyclic aromatic hydrocarbons in diesel particulate matter deposited on the ground.
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DOI：
10.1021/es001606q
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发表时间：
2001-08
影响因子：
11.4
通讯作者：
S. Matsuzawa;L. Nasser-Ali;P. Garrigues
中科院分区：
文献类型：
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作者：
S. Matsuzawa;L. Nasser-Ali;P. Garrigues
为了阐明沉积在地面上的柴油颗粒物中多环芳烃（PAHs）的光解行为，我们测定了苯并[a]芘（BaPy）、菲（Phe）、荧蒽（Flrt）、芘（Py）和金（Ch）在空气中的三种可能情况下的光解速率常数和半衰期：（1）将杀虫剂放在惰性表面上，（2）将杀虫剂与土壤混合，（3）多环芳烃从杀虫剂中浸出并吸附到土壤中。我们发现BaPy和Phe在情况1中降解相对较快。然而，在情况2中，这些多环芳烃降解较慢，由于土壤的存在的影响。Flrt、Py和Ch稳定。在情况3中，吸附的多环芳烃在土壤中的光降解强烈抑制作为土壤深度的函数。虽然这些发现是在极端光照强度下获得的，但它们可能发生在真实的世界条件下。转换因子获得的速率常数和半衰期多环芳烃在阳光下的地面。我们的结论是，在东京的平均强度的阳光下，光降解的多环芳烃在沉积在惰性表面上是非常缓慢的。
To clarify the photolytic behavior of polycyclic aromatic hydrocarbons (PAHs) in diesel particulate matter (DPM) deposited on the ground, we determined the rate constants and half-lives for the photodegradation of benzo[a]pyrene (BaPy), phenanthrene (Phe), fluoranthene (Flrt), pyrene (Py), and chrysene (Ch) in air for three probable cases: (1) DPM is placed on an inert surface, (2) DPM is mixed with soil, and (3) PAHs are leached from DPM and adsorbed to soil. We found that BaPy and Phe degraded relatively quickly in case 1. However, in case 2, these PAHs degraded more slowly due to the effect of the presence of soil. Flrt, Py, and Ch were stable. In case 3, photodegradation of adsorbed PAHs in soil was strongly inhibited as a function of soil depth. Although these findings were obtained at extreme light intensities, they may occur under real world conditions. Conversion factors for obtaining rate constants and half-lives for PAHs on the ground under sunlight are presented. We conclude that under the average intensity of sunlight in Tokyo, photodegradation of PAHs in DPM deposited on an inert surface is very slow.