Analytical Method: Iron in glass gall

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. 114549  Spectroquant® Iron Cell Test
Cat.No. 114761  Spectroquant® Iron Test
Cat.No. 114761  Spectroquant® Iron Test
Cat.No. 100796  Spectroquant® Iron Test
Cat.No. 100316  Hydrochloric acid 25 % for analysis
Cat.No. 100456  Nitric acid 65 % for analysis
Cat.No. 116754  Water for analysis
 

Sample preparation:
In a porcelain-ball mill ground about 1 kg glass gall finely (3 hr) and dry 100 g of this material at 120 °C to constant weight. In a 1000-ml glass beaker place 10 g of the dried sample and add 30 ml hydrochloric acid 25 % in small portions. The acid addition is so regulated as to avoid excessive foaming. After addition of each acid portion cover the beaker with a watch glass. After all the sample material has been brought into solution, reduce the solution to a volume of 10 ml by evaporation on the steam bath. Add 10 ml of nitric acid 65 % and re-evaporate. Dissolve the remaining syrupy residue in water for analysis, transfer to a 1000-ml volumetric flask and fill up to the mark with water for analysis. After thoroughly mixing pipet out 10 ml into a 100-ml volumetric flask, fill up to the mark with water for analysis and mix well.
 
Analysis:
Determine with the above mentioned test kits.
 
Calculation:
Iron oxide content in % Fe2O3 = analysis value in mg/l Fe x 0.143

 

Materials

     
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