Mechanisms of Citric Acid-Induced Arsenic Migration and Transformation and Its Effects on Bioavailability
This experiment employed highly arsenic-contaminated paddy soil collected from Yingdian Town, Zhuji City, Zhejiang Province as the test soil. Citric acid was selected as a representative component of soluble organic matter in soil, and three concentration levels (0.1 mM, 1 mM, and 5 mM) were established. A 50-day dynamic pot experiment was conducted to investigate the effects of different citric acid concentrations on total arsenic content and the distribution of arsenic fractions in soil. Meanwhile, variations in soil pH and redox potential (Eh) were monitored. The aim was to elucidate the influence of organic acids on arsenic migration and transformation processes in paddy soils.