Analytical Method: Zinc (total) in effluents, high organic content

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. 114566  Spectroquant® Zinc Cell Test
Cat.No. 100861  Spectroquant® Zinc Cell Test
Cat.No. 114832  Spectroquant® Zinc Test*
Cat.No. 100731  Sulfuric acid 95 - 97 % for analysis
Cat.No. 107209  Hydrogen peroxide 30 % (Perhydrol®) for analysis
Cat.No. 105590  Sodium hydroxide solution 32 %
Cat.No. 109535  MColorpHastTM Universal Indicator strips pH 0 - 14
Cat.No. 116754  Water for analysis
*not compatible with Move 100
Sample preparation:
Place 25 ml sample in a 400-ml beaker along with 5 ml sulfuric acid 95 -97 % and 5 ml Perhydrol®, mix and slowly heat on a heating plate until the sulfuric acid begins to fume. Allow to cool, add 5 ml Perhydrol® and heat again until SO3 is released. Depending on the organic content of the sample, repeat this process up to three times. The fully digested sample should be clear and practically colorless.
Dilute the solution with approximately 40 ml water for analysis and adjust to pH 3 - 5 with sodium hydroxide solution 32 % (check the pH by using Universal indicator strips). Transfer the mixture to a
50-ml volumetric flask, make up to the mark with water for analysis and mix well.
Determine with the above mentioned test kit.
Zinc (total) content in mg/l Zn = analysis result in mg/l Zn x 2


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