The use of calcium peroxide (CaO_2) as a process applied to arsenic contaminated soil around an abandoned tungsten mine, southern China

摘要

To reduce As bio-available and uptake in celery, calcium peroxide (CaO_2) was applied as a stabilizer, In the batch experiments, with the increase of CaO_2 concentration addition, the pH of soil was increased significantly. With the application of CaO_2 at low concentration, the bio-available As was decreased significantly, while application of high concentration of CaO_2 increased As mobility significantly. In the field experiments, CaO_2 application could alleviate As toxicity to celery. The biomass of celery shoots increased significantly while the As concentration in the shoots of celery decreased significantly with CaO_2 application. The optimal dose of CaO_2 application was 750 kg/ha, at this dosage, the celery had the highest biomass and lowest As concentration.