Abstract
A novel attenuated total reflection (ATR) sensor, which integrates solid-phase extraction (SPE) and infrared detection, is presented. The flow cell, which enables the on-line coupling with a sequential injection system, is the core of the proposed sensor since it allows the continuous delivery of different solutions through the ATR and also the continuous spectrum acquisition. A SPE sorbent material (LiChrolut EN) was located in the sensitive element of the ATR without using any external coating substance, increasing the versatility of the system. A marked sensitivity enhancement was obtained as the analyte was concentrated before detection. The new sensor was qualitatively and quantitatively validated using the determination of caffeine in soft drinks as the model analytical problem. Linearity, precision (RSD = 4%), and sensitivity (LOD = 7 microg/mL) levels have been established. Finally, the main advantages and limitations of the new proposal are presented and compared with existing alternatives.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
