Batch experiments were conducted to study the migration behavior of arsenic (As) and iron (bivalent, trivalent, and total Fe) of the presence of the low molecular weight organic acids (LMWOAs) citric acid, malic acid, and oxalic acid in As-enriched mangrove sediments. The results for supernatant As/Fe species were significant according to each LMWOA treatment. Significant non-linear correlations were found among As level, pH, and acid dose based on our predictive model. The capacity of LMWOAs to mobilize As/Fe species followed the order of citric acid > malic acid/oxalic acid. The supernatant As correlated positively with the LMWOAs dose and negatively correlated with the pH. As migration was affected by acid strength, the number of carboxyl groups, the pH and levels of Fe compounds in the sediments. The results indicate that LMWOAs can potentially attenuate As contamination from mangrove sediment, allowing for a better understanding of As/Fe behavior in the rhizosphere.

进行批处理实验以研究低分子量有机酸（LMWOAs）柠檬酸，苹果酸和草酸在As-中的存在下砷（As）和铁（二价，三价和总Fe）的迁移行为丰富的红树林沉积物。根据每种LMWOA处理，上清液中As / Fe物质的结果均显着。根据我们的预测模型，发现砷含量，pH和酸剂量之间存在明显的非线性相关性。LMWOAs迁移As / Fe物种的能力遵循柠檬酸>苹果酸/草酸的顺序。上清液As与LMWOAs剂量呈正相关，与pH呈负相关。由于迁移受酸强度，沉积物中羧基数量，pH和Fe化合物含量的影响。