芘在土壤中的共代谢降解研究

高分子量多环芳烃（PAHs)的降解通常以共代谢方式进行，研究比较了高分子量多环芳烃代表种类芘作为唯一C源和能源的降解过程和有共代谢底物存在下的降解过程，结果表明，25d后前者中芘的降解率57％，而后者中芘的降解率为80％，且有共代谢底物存在下，芘在降解过程中关衰期缩短；水扬酸，邻苯二甲酸，琥珀酸钠能作为共代谢底物提高芘的降解率，琥珀酸钠效果最好，芘和低要子量多环芳烃之间也有共代谢关系，菲促进了芘的降解，但萘未出现同样的结果，此外，这阐明了共代谢原理和适宜作高分子量多环芳烃共代谢底物的物质。

Co-metabolic degradation of pyrene in soil

High molecular weight Polycyclic Aromatic Hydrocarbons (PAHs) are always degraded by means of co metabolism.This study compared the degradation process of pyrene as sole source of carbon and energy and co metabolic degradation process of pyrene.The degradation rate of pyrene after 25 days in the first process was 57%,while the degradation rate of pyrene in the co metabolic processes were about 80%.The half life of pyrene in the co metabolic process was shorter than those in the processes without co metabolism.Salicylic acid,phthalic acid,sodium succinate could serve as co metabolic substrate to enhance the degradation rate of pyrene,and sodium succinate has the best effect.There was co metabolic relationship between pyrene and phenanthrene which was a kind of low molecular weight PAHs,phenanthrene accelerated the degradation of pyrene,while naphthalene didn't.The principle of the co metabolism and the optimal material used as co metabolic substrate were demonstrated in this paper.