Sensors regeneration

The three above-mentioned types of kinetics also influence other aspects of sensor performance (Fig. 2.20). Thus, the signal-time profiles they provide are critically dependent on the kinetics of the processes involved for example, if the sensor regeneration is rather slow, baseline restoration is much too slow. As noted earlier, a slow chemical kinetics can be used to perform reaction rate measurements. 

Sensor regeneration was performed by heating at 150°C for 10 min. After such heating, a new adsorption of alkylthiols was performed. One can expect that complete regeneration can be performed also by lower temperature ( 100-120°C), which does not damage the monolayer of alkylthiols. 

The sensor can be used for multiple substrate injections after the AChE loading and for repeated AChE immobilization after sensor regeneration. AChE from the electric eel could be specifically bound in concentration down to 5 pg/mL (=21 nM) (22). 

Quantitative capture sensing approaches are well suited for analytical characterization in die field, where sensor regeneration or renewal procedures are acceptable. Although renewable reagent or renewable surface sensors could be engineered for in situ monitoring, provided that the consiunable volumes per measurement are very small, reagentless sensors would be preferable for extended periods of in situ operation. 

EPA and ATSDR accept Jerome findings for cieanup. With on-board data iog-ging, battery powered sensor regeneration, and storage of 20,000 data points, the Jerome J405 is the best instrument for mercury vapor detection on the market. Find out more at www.azic.com. 

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