Quality control of gasohol using a micro-unit for membraneless gas diffusion

Abstract

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.

Ethanol concentration and calorific value of some local distilled Ethiopian alcohol (Areki): an energy potential assessment

“…Gas chromatography (GC) is the analytical technique, which is recommended by the American Society for Testing and Materials for the determination of volatile ethers and alcohols (including ethanol) in gasoline (Pereira, 2012;Teshome, 2017). Also, a simple spectrophotometric method was described for the determination of ethanol in gasohol and Alcoholic beverage (Muncharoen et al, 2009). Electrochemical detectors such as contactless impedance (Opekar et al, 2011;Rocha & Simões-Moreira, 2005) and amperometery (Opekar et al, 2011) have been proposed for the determination of ethanol in gasoline.…”

A simple contactless impedance probe for determination of ethanol in gasoline

“…Many other analytical methods have recently been reported, e.g., Raman spectroscopy [4], Fourier transform infrared spectroscopy [5], near infrared spectroscopy [6], and nuclear magnetic resonance spectroscopy [7]. Methods based on distillation curves and multivariate analysis [8], membraneless gas diffusion and diode array UV/vis detection [9], enzymatic bio-systems combined with flow injection * Corresponding author. Tel.…”

A permeable membrane capacitance sensor for ionogenic gases

“…It is not limited to species that can be rendered unionized by acid/base reactions, applications for ozone, chlorine etc as water disinfectants were among the earliest [3][4][5]. It is also not limited to the use of membranes [6][7][8][9].…”