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Analytical Method: Nickel in mineral water (Food and Beverages)

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. 106448  tri-Sodium citrate dihydrate for analysis

 

Measuring range:
0.02 – 5.00 mg/l Ni (Cat. No. 114785) or 0.10 – 6.00 mg/l Ni (Cat. No. 114554)

 
Sample preparation:
Carbonated water has to be degassed prior to the photometric analysis. For this, for example 100 ml of the water sample are placed in a glass beaker. Now, it either can be stirred on the magnetic stirrer or nitrogen can be led through the sample. In both procedures, the duration of the treatment depends on the volume of the sample and its carbon dioxide content. A duration of at least 15 minutes is recommended. Alternatively, the sample may be boiled up for a short period of time and after the cooling, the possibly accruing precipitate can be filtered via a fluted filter.


In water containing large amounts of hardening constituents, after the addition of all reagents of the test sets, a turbidity occurs. This can be dissolved with the addition of about 20 mg tri-sodium citrate dihydrate without disturbing the detection of nickel. The masking reagent is added after the addition of the reagent Ni-2 (Cat. No. 114785) respectively of Ni-1K (Cat. No. 114554) and dissolved by shaking. Subsequently proceed as described in the package insert.

 
Analysis:
The determination takes place with the above-mentioned test kits against a reagent blank.

 
Calculation:
Nickel content in mg/l Ni = analysis value in mg/l Ni

Materials

     
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