Analytical Method: Nitrate in pectin powder

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. 114542  Spectroquant® Nitrate Cell Test
Cat.No. 114563  Spectroquant® Nitrate Cell Test*
Cat.No. 114764  Spectroquant® Nitrate Cell Test*
Cat.No. 114773  Spectroquant® Nitrate Test
Cat.No. 109713  Spectroquant® Nitrate Test*
Cat.No. 110537  Carrez Clarification
Cat.No. 116754  Water for analysis
*not compatible with Move 100
Sample preparation:

Place about 150 ml water for analysis in a 250-ml volumetric flask and add about 1 g (exactly weighed) of the sample. Fill up to volume with water for analysis and stir for 1 hour with a magnetic stirrer.
Mix 20 ml of the produced suspension with 2.5 ml each Carrez-1 and -2 solution, centrifuge with 4000 turns per minute for 10 minutes.
Use the clear supernatant liquid to determine nitrate.
Determine with the above mentioned test kits.

Nitrate content in g/kg NO3 = analysis value in mg/l NO3 x 0.31
weight of sample in g



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