Improvement of Primary- Secondary Wavelengths Spectrophotometric Determination of Trace Amounts of Sulfide in Water

Abstract

In acidic solution and in presence of ferric ions the conventional

reaction of sulfide (S^2–) with p-aminodimethylaniline to form

methylene blue dye has been applied for the improvement of the

sulfide determination in natural water and waste water by the updated

method named primary–secondary wavelengths spectrophotometry

(PSWS). The results show that the analytical precision

and accuracy were increased and given the higher determination

sensitivity than the ordinary spectrophotometry.