Study On Characteristics Of Typical Antibiotics Migration In Soil Irrigated By Reclaimed Water

This paper studies the sulfonamides, tetracyclines and quinolones migrationcharacteristics in soil; especially it analyses how different soil layers, different flow ratesand different leaching concentration will influence the migration of antibiotics individually.The micro-lysimeter device is used to simulate the migration of antibiotics in undisturbedsoil. Specific findings are as follows:1) Different layers of soil have different impacts on antibiotic migration.With the depth in soil, the leaching rate of sulfa antibiotics in the leachates enhances;residual volumes of tetracycline in the surface soil increase. Quinolone antibiotics hasmaximum residues in the40-60cm soil concentration.2) Different leaching flow rates have different impacts on antibiotic migration.The increasing of leaching flow rate will accelerate the leaching effect of theantibiotic. At a flow rate of2mL· min-1, sulfa antibiotics leaching significantlystrengthens; Tetracyclines and quinolones residual volumes in surface soil increaseobviously.3) Different leaching concentrations have different impacts on antibiotic migration.At a leaching solution concentration of500μg· L-1, sulfa antibiotics leaching inleachate concentrations were significantly increased. At the same time, sulfa antibiotic isin high concentration in the surface soil, and it migrates down; Top soil tetracyclines andquinolones residual concentration increases.4) The antibiotics migration study under the control of the Lysimeter.In the Lysimeter simulation experiment, a large number of sulfa antibiotics isdetected in the first level of the soil leachate. The sulfa antibiotic shows an obviousgradient trend in the leachates from the second to the fifth level. In the leachate a smallamount of tetracyclines and quinolones are detected.