Volumetric triangle-programmed flow titration based on precisely generated concentration gradients
✍ Scribed by B. Fuhrmann; U. Spohn
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 904 KB
- Volume
- 282
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
Linear concentration gradients were generated by means of computer-controlled micropumps to implement triangle-programmed flow titrations. Precise determinations could be performed under defined conditions without calibration. The use of inverse flow-rate gradients enables volumetric titrations to be performed in constantly flowing streams. The mixing of flow-rate gradients of the titration reagent and the sample solution, which are inverse to each other, opens up a way to titrate samples with concentrations varying over several orders of magnitude. The zone sampling out of precisely defined triangle concentration profiles and the injection into a continuously streaming sample or standard solution opens up a way to methods of flow-injection analysis (FIA) with improved reliability and on-line calibration. The titrations and the FL4 procedures are controlled and analysed automatically by a personal computer. A compact and fully automated flow titrator was developed.