Determination of nickel in asphaltite ash by ultraviolet-visible spectrophotometry and direct current arc emission spectrography

Abstract

The nickel content of Turkish asphaltite ash was determined and the conditions for the spectrophotometric and spectrographic determination of nickel were investigated. The spectrophotometric determination was performed by measuring the absorbance of the nickel-dimethylglyoxime complex in chloroform. The method was applied to the determination of nickel in standard rock samples containing 6.0 µg ml^–1 Ni with a relative error of 1.7%. For the spectrographic determination tetramethylammonium iodide was used as a spectral buffer. The nickel content of asphaltite ash was found to be 0.44% with both methods.