Analytical Method: Aluminium (Total) in Effluents, High Organic Content

Instrument 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. 100594  Spectroquant^® Aluminium Cell Test
Cat.No. 114825  Spectroquant^® Aluminium Test
Cat.No. 100731  Sulfuric acid 96% for analysis
Cat.No. 107209  Perhydrol^® 30% for analysis
Cat.No. 105590  Sodium hydroxide solution 32%
Cat.No. 109535  Universal Indicator strips pH 0 - 14
Cat.No. 116754  Water for analysis
 

Sample Preparation:

Place 25 ml sample in a 400 ml beaker along with 5 ml 96% sulfuric acid and 5 ml Perhydrol^®, mix and slowly heat on a heating plate until the sulphuric 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 32% sodium hydroxide solution (check the pH by using Universal Indicator strips pH 0 -14). 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 kits.

Calculation:

Aluminium (total) content in mg/l Al = analysis result in mg/l Al x 2