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To understand the mechanism controlling cultivar differences in the accumulation of ciprofloxacin (CIP) in Chinese flowering cabbage ( Brassica parachinensis  L.), low-molecular-weight organic acids (LMWOAs) secreted from the roots of high- and low-CIP cultivars ( Sijiu  and  Cutai , respectively) and their effects on the bioavailability of CIP in soil were investigated. Significant differences in the content of LMWOAs (especially maleic acid) between the two cultivars played a key role in the variation in CIP accumulation. Based on the Freundlich sorption coefficient ( K    f  ) and distribution coefficient ( K    d  ), the presence of LMWOAs reduced the CIP sorption onto soil particles, and higher concentrations of LMWOAs led to less CIP sorption onto soil. On the other hand, LMWOAs enhanced CIP desorption by lowering the solution pH, which changed the surface charge of soil particles and the degree of CIP ionization. LMWOAs promoted CIP desorption from soil by breaking cation bridges and dissolving metal cations, particularly Cu 2+ . These results implied that the LMWOAs (mainly maleic acid) secreted from  Sijiu  inhibited CIP sorption onto soil and improved CIP desorption from soil to a greater extent than those secreted from  Cutai , resulting in higher bioavailability of CIP and more uptake and accumulation of CIP in the former.

Low-molecular-weight organic acids correlate with cultivar variation in ciprofloxacin accumulation in Brassica parachinensis L.