Effects of low molecular weight organic acids (LMWOAs) on Pb,Cd,Cu and Zn from contaminated soils were studied.The results showed that Pb,Cd,Cu and Zn in the soil were partly dissolved by four LMWOA solutions under different concentrations in batch experiment. The desorption sequence of each LMWOA for different heavy metals were in the order of citric〉tratric ≈succinic〉oxalic (for Pb and Cd), citric 〉oxalic 〉tratric ≈succinic (for Cu), tratric 〉citric ≈succinic 〉oxalic (for Zn). The concentrations of heavy metals in solution were enhanced with the i...