Solid-state microprocessor-controlled detector for doublet peak measurements in flow-injection analysis
✍ Scribed by Mary K. Carroll; Michael Conboy; Asaph Murfin; Julian F. Tyson
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 654 KB
- Volume
- 295
- Category
- Article
- ISSN
- 0003-2670
No coin nor oath required. For personal study only.
✦ Synopsis
A solid-state detector for time-based transmission measurements in flow-injection analysis #'IA) based on a light-emitting diode (LED) source and photodiode (PD) transducer with microprocessor controller is described. The instrument components cost less than US$ 500. A simple peak-finding algorithm was capable of accurate measurements of the time interval between doublet peaks (At). Comparison of results, obtained using the detector, with theory for an acid-base reaction with bromothymol blue indicator is made. Linear relationships between the measured At and the logarithm of the injected concentration were obtained for two systems whose injection volumes were 987 and 1650 ~1. The correlation coefficients, based on 14 and 13 data points, were 0.99, and 0.99,, respectively. The detector could measure transmittance signals corresponding to 0.00098 absorbance above the baseline.