This work describes development of a new spectrophotometric flow analysis technique suitable for monitoring of ethanol content in gasohol fuel. In this technique, the concept of membraneless gas-diffusion (MBL-GD) was applied with one-step aqueous extraction of gasohol (1:2 gasohol:water). Segments of aqueous extract and color developing reagent were allowed to flow into two separate channels in the MBL-GD device. Inside the device, ethanol vapor can diffuse across a small headspace between the two channels (donor and acceptor). Introduction of an air-segment behind the zone of acceptor reagent to stop dispersion of the colored zone has greatly improved the rapidity of analysis using this MBL-GD technique. Two methods were developed for quality control of gasohol by measuring ethanol content. Method I is suitable for direct calibration of E5 and E10. Method II is recommended for E20. These methods have high accuracy with good precision (% RSD: 1 to 4.9, n=45) and have a sample throughput of 26 samples h -1 . E10 samples were compared with analysis using a standard GC method.
Chitosan-coated magnetite nanoparticles (Chitosan@Fe3O4) used to modify on the carbon paste electrode (Chitosan@Fe3O4/CPE) for enhance sensitivity for salicylic acid (SA) analysis using square wave voltammetry (SWV) was developed in this work. The performance and behaviour of the purposed electrodes using cyclic voltammetry (CV) were investigated. The results showed that the mixed behaviour process was observed. Furthermore, parameters affecting SWV were also studied. It was discovered that the optimum conditions were two-linearity range of SA determination of 1-100 and 100-400 µM. Limits of detection (LOD) and limits of quantitation (LOQ) for SA are 0.57 µM and 0.90 µM, respectively. The proposed electrodes were successfully used to determine SA in applications employing pharmaceutical samples.
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