Abstract:
Spectrophotometric and polarographic techniques were used for cyanide and sulfide ions
determination. Chloramine-T and barbituric acid were used as reagents for complex formation
and 0.5M H3BO3+ 0.1M KOH and 0.02 M ascorbic acid + 0.018 M disodium EDTA + 100
mL of 1M NaOH supporting electrolytes for polarography. The Interference effect of the
interfering ions Cl -
, Ca2+, Mg2+, Fe3+, and Cu2+ was studied. For eliminating the effect of
interference , distillation method was used for distillation of cyanide solutions. The
concentration of cyanide ion in several samples of drinking water, natural water and waste
water were determined by both techniques. The linearity of cyanide determination by
spectrophotometric was ranged from (0.05 - 0.5 ppm) at a wavelength (578 nm). The linearity
for cyanide ion determination by polarography was ranged from (0.02 - 0.2 ppm).