Analytical Method: Nickel (total) in building materials

Instruments and Reagents:

Cat.No. 173016  Spectroquant® VIS Spectrophotometer Prove 100 or

Cat.No. 173017  Spectroquant® UV/VIS Spectrophotometer Prove 300 or

Cat.No. 173018  Spectroquant® UV/VIS Spectrophotometer Prove 600 or

Cat.No. 109748  Spectroquant® Photometer NOVA 30 or

Cat.No. 109751  Spectroquant® Photometer NOVA 60 or

Cat.No. 173632  Spectroquant® Colorimeter Move 100

Cat.No. 114946  Rectangular cells 10 mm and/or

Cat.No. 114947  Rectangular cells 20 mm and/or

Cat.No. 114944  Rectangular cells 50 mm
Cat.No. 114554  Spectroquant® Nickel Cell Test
Cat.No. 114785  Spectroquant® Nickel Test
Cat.No. 104885  Potassium hydrogen sulfate for analysis
Cat.No. 109584  MColorpHastTM pH-indicator strips, pH 2.0 - 9.0
Cat.No. 116754  Water for analysis

Differential analysis of nickel soluble in hot water and total nickel can be carried out with suitable sample preparation.
Sample preparation - hot water extraction:
Prepare a fine powder of the sample and dry at 105 °C. Mix 5 g with water for analysis and boil for 30 minutes on a hot plate. Allow to cool, transfer the suspension to a 200-ml volumetric flask and make up to the mark with water for analysis. Mix well, filter through a paper filter and use the filtrate as sample for the determination of water-soluble nickel.
Sample preparation - total content:
Place 200 mg of the finely powdered material along with 5 g potassium hydrogen sulfate for analysis in a DURAN test tube, mix and heat gently in a Bunsen flame until a clear orange-colored melt is obtained and no more gas is given off. Allow to cool, add water for analysis to dissolve most the residue and transfer the suspension to a 100-ml volumetric flask. Make up to the mark with water for analysis and mix well.
Filter through a paper filter and adjust the pH to 3 - 8.
Determine with the above mentioned test kits.
Nickel content (water-soluble) in %  Ni  =  analysis value in mg/l Ni x 0.004
Nickel total content in %  Ni  =  analysis value in mg/l Ni x 0.05


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