| Autor: |
Freeman, J.E., Childers, A.G., Steele, A.W., Hieftje, G.M. |
| Zdroj: |
Analytica Chimica Acta; January 1985, Vol. 177 Issue: 1 p121-128, 8p |
| Abstrakt: |
A device for remote optical sensing is developed and evaluated for monitoring the concentration of copper(II) ions in an industrial plating bath. The sensor consists of an absorption cell which resides in the plating bath, and utilizes fiber optics to direct light into and out of the cell. The sensor is capable of being located in harsh environments for extended periods of time (on the order of weeks to years) and thus is ideal for long-term monitoring applications. The light source and detection electronics can be maintained in a controlled environment and can be multiplexed to several sensors of similar design, if desired. The sensor constructed operates by measuring the copper(II) absorbance with a near-infrared light-emitting diode (820 nm) as the light source. The device is capable of measuring copper(II) ion concentrations from 50 mM to 500 mM with relative standard deviations less than 1%. The construction and operation of the sensor are described and the effects of various interferences found in plating baths are evaluated, including those from temperature variations and variations in the concentrations of concomitant species in the plating bath. Also, drift compensation and noise sources are considered, with an evaluation of the long-term stability of the sensor and the feasibility of its use in an industrial environment. |
| Databáze: |
Supplemental Index |
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