研究目的
To develop a simple, accurate, and fast flow-batch procedure employing photometric detection for the determination of sulfate in fuel ethanol without sample preparation.
研究成果
The proposed flow-batch procedure is robust, practical, fast, and sensitive for the determination of sulfate in fuel ethanol, requiring no sample preparation. It offers advantages such as low waste generation, high sampling throughput, and good linear response range. The method's accuracy was confirmed by comparison with ion chromatography, showing no significant difference at the 95% confidence level.
研究不足
The procedure is specific to sulfate determination in fuel ethanol and may not be directly applicable to other matrices without modification. The presence of certain interferents at high concentrations may affect the accuracy.
1：Experimental Design and Method Selection:
The procedure is based on the reaction between sulfate and barium with the formation of soluble barium sulfate in alcoholic medium and subsequent reaction of the remaining barium with dimethylsulfonazo III (DMS), monitored at 655 nm.
2：Sample Selection and Data Sources:
Samples of ethanol fuel were supplied by several ethanol fuel producers in S?o Paulo State (Brazil), analyzed without any previous treatment.
3：List of Experimental Equipment and Materials:
The setup included compact peristaltic pumps, solenoid pumps, a tree-way solenoid valve, a flow batch chamber, a magnetic stirring bar, a tungsten lamp, and a UV–vis USB-4000 spectrometer.
4：Experimental Procedures and Operational Workflow:
The procedure comprises filling the channels with the reagent solutions, cleaning the chamber, sampling stage, injection of reagent R2 solution into the reaction chamber, and a cleaning step.
5：Data Analysis Methods:
The absorbance of the product (DMS-Ba) was monitored at 655 nm, and optimizations were done by univariate assays.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
