Method development for arsenic analysis by modification in spectrophotometric technique

摘要

Arsenic is a non-metallic constituent, present naturally in groundwater dueto some minerals and rocks. Arsenic is not geologically uncommon and occursin natural water as arsenate and arsenite. Additionally, arsenic may occurfrom industrial discharges or insecticide application. World HealthOrganization (WHO) and Pakistan Standard Quality Control Authority haverecommended a permissible limit of 10 ppb for arsenic in drinking water.Arsenic at lower concentrations can be determined in water by using hightech instruments like the Atomic Absorption Spectrometer (hydride generation).Because arsenic concentration at low limits of 1 ppb can not be determinedeasily with simple spectrophotometric technique, thespectrophotometric technique using silver diethyldithiocarbamate wasmodified to achieve better results, up to the extent of 1 ppb arsenicconcentration.