Table 1: The ranges of experimental parameters.

pHAdsorbent dosage (g/L)Salvadora persica stem ash (°C)Arsenic concentration, g/LContact time, min

2, 3, 4, 5, 6, 7, 8, 9, 10, 110.5, 1.5, 2.5, 3.5, 5, 6300, 50050, 100, 150, 200, 400, 500 20, 40, 60, 80, 100, 120, 180, 240