A feasibility study was conducted to assess the application of a streaming current detector (SCD) in notation processes. The adsorbing colloid notation (ACF) of As(V) with iron oxide and sodium dodecylsulfate (SDS) was investigated. Both zeta potential and streaming current (SC) reading of each colloidal systems were measured. Results show SC changed with pH values and can be well correlated to zeta potential. The optimum pH range for As(V) removal was found to be ca. 4-5. Removal of As(V) as affected by SDS concentration, colloidal concentration, and gas flow rate were investigated, It is proposed that both free arsenic oxyanions and iron-arsenate complex were involved in the process. Preliminary results show it feasible for SCD to be utilized in adsorbing colloid flotation.