Table 6. As removal from water of different origins via electrocoagulation.

No	Sample	Coagulation agent	Conditions	Removal efficiency%		Reference
				AsIII	AsV
1	Water	Fe	Electrocoagulation: pH = 6–8	99	99	235
2	Water	Fe	Chemical coagulation; pH = 6 for AsIII; pH = 6–7 for AsV	98	99	235
3	Water	Fe3+ + Al3+	Electrocoagulation; pH = 4–10, As removal = 1–1000 μg mL−1	—	—	236
4	Natural ground water	Cu–Cu	Electrocoagulation: pH = 6–7	99.89	—	237
5	Natural ground water	Zn–Zn	Electrocoagulation; pH = 6–7	99.56	—	237
6	Wastewater	Stainless steel	Electrocoagulation; AsIII is oxidized to AsV; pH = 5.2		86–99.6	91
7	Groundwater	Al and Fe scrap anodes	Electrocoagulation; AsIII is oxidized to AsV; pH = 5–8	—	93.5	238
8	Drinking water	Graphene oxide-manganese ferrite (GMF)	Adsorptive mixed matrix membrane; pH = 4	—	102a	239
9	Drinking water	adsorptive mixed matrix membrane	MMMs incorporated with different loading of hydrophilic GMF nanomaterial (0.5–2.0 wt%)	—	75.5 a	239

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