Merck
HomeWaste Water & Process Water​ TestingAnalytical Method: Zinc (total) in effluents, high organic content

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.

Analysis:
Determine with the above mentioned test kit.

Calculation:
Zinc (total) content in mg/l Zn = analysis result in mg/l Zn x 2

Materials
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