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Photometric Titrations

Good reasons for Titration with photometric endpoint recognition

  • potentiometric endpoint indication is not possible
  • no suitable potentiometric indicator electrode is available
  • an official method prescribes photometric indication
  • the electrode signal is disturbed by sample matrix effects
  • one wishes to profit from the economical advantages offered by the photometric method compared to more expensive techniques, such as AAS or ICP-AES
  • easy handling, quick and precise measurements are of prime importance

Typical Applications for the Spectrosense

Species determined Matrix Color indicator
Wavelength λ
Al Sodium borate Xylenol orange 523 nm
Free chlorine Water N,N-Diethyl-1,4-phenylenediamine 523 nm
Acid number Plastic material Phenolphthalein 523 nm
Sulfate Fertilizer Thorin 523 nm
Vitamin C Tablets Dichlorophenol indophenol 523 nm
Ba / Y / Cu Superconductor Dimethylsulfonazo III 610 nm
Traces of Ca Brine Hydroxy naphthol blue 610 nm
Ca / Mg Dolomite Eriochrome black T / HHSNN 610 nm
Fe Mn ores Diphenylaminosulfonate 610 nm
Zn Ni baths Murexide 610 nm

Application Examples for photometric titration

Metrohm Application Bulletins

Method C: Photometry
> Download of bulletins: English, French, German
Number Title Branche(s)
029-E Determination of chlorine in water with the 662 Photometer 2 7
030-E Photometric determination of chromium(VI) 2
033-E Determination of the total, calcium and magnesium hardness of water samples by photometric titration 1 2 7 15
044-E Colorimetric determination of boron 1 2 11
045-E Colorimetric determination of silicic acid 1 2
049-E Colorimetric determination of copper 1 2
063-E Determination of silicon, calcium, magnesium, iron and aluminum in cements by photometric titration of the solubilized product 1 15
085-E Analysis of jams, fruit and vegetable juices and their concentrates 7
087-E Analysis of dairy products 7
094-E Potentiometric and photometric analysis of honey 7
098-E Determination of ascorbic acid (vitamin C) and its compounds 1 3 4 7 8
140-E Titrimetric determination of sulfate 1 2 3 7 11 12 15
> Download of bulletins: English, French, German

Visit our Product Information for photometric titration

 
   
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Analytical instruments in Swiss quality