Effects of calcium peroxide on arsenic uptake by celery (Apium graveolens L.) grown in arsenic contaminated soil

► CaO2 has a great potential as soil amendment to treat As contaminated soils. ► CaO2 alleviated As toxicity to celery through the formation of non-labile As. ► Celery was safe for eating treated with 750 kg ha−1 CaO2 in field experiment.