Primary-Secondary Wavelength Spectrophotometry to Improve the Determination of Trace Amounts of Nickel in Waste Water

Abstract

In ammoniacal solution of nickel, in presence of iodine the

conventional reaction of nickel (Ni²⁺) with diacetyldioxime to form

red complex has been applied for the improvement of the determination

of trace amounts of nickel in 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 gave the higher

determination sensitivity than the ordinary spectrophotometry. The

relative standard deviations were less than 1.3% and the recovery

rate of Ni between 96 and 102%.