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. 100456 Nitric acid 65 % for analysis
Cat.No. 107209 Hydrone peroxide 30 % (Perhydrol®) for analysis
Cat.No. 109137 Sodium hydroxide solution 1 mol/l
Cat.No. 109535 MColorpHast Universal Indicator strips pH 0 - 14
Cat.No. 116754 Water for analysis

Sample preparation:

Place 25 mL sample in a 600-mL beaker along with 5 mL65 % nitric acid and 5 mL Perhydrol®, mix and slowly evaporate, almost to dryness, on a heating plate. Dissolve the residue in water for analysis and transfer to a 25-mL volumetric flask.
Measure the pH immediately using Universal indicator strips 0 - 14 and adjust to pH 3 - 7, if necessary, using 1 mol/l sodium hydroxide solution. Only now make up to the mark with water for analysis and mix.

Analysis:

Determine with the above mentioned test kits.

Calculation:

Nickel (total) content in mg/l Ni = analysis value in mg/l Ni

Materials
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