Analytical Method: Nickel (total) in effluents (Photometry, DIN decomposition)

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