Abstract
Organic fluorides can arise due to the usage of HF in technologies of gasoline production, therefore, it is necessary to identify contamination of gasoline or its components with organic fluorine. For this aim, simple and fast method is proposed. The method relies on sample dilution in xylene, followed by the solution aspiration to a high-resolution continuous source spectrometer for measurement of absorption of radiation by GaF molecule, arisen in air-acetylene flame. Gallium(III) acetylacetonate is carefully dissolved and introduced to all measured solutions at Ga concentration 5000 mg L−1. For standard addition calibration three types of samples solutions are prepared to contain: none, 50 mg L−1 and 100 mg L−1 of added fluorine. As fluorine standard 2, 2, 3, 3, 4, 4, 4-heptafluoro-1-pentanol is applied. The lowest possible flow rate of acetylene is recommended. The solution flow rate and the additional air flow rate should be adjusted to obtain not-disturbed baseline. The overlap of the GaF signal with residual signal of the OH molecule can be overcome using least square background correction. Five pixels are recommended for signal evaluation at the most sensitive 211.248 nm rotational “line”. Using such conditions characteristic concentration was 3.2 mg L−1. Detection limit recalculated for initial sample was 4-10 mg L−1.•High-resolution continuum source flame molecular absorption spectrometry turned out to be an excellent tool for determination of pollution of gasoline with organic fluorine.•Due to application of GaF as a target molecule, it is possible to use a low-temperature and easy for operation air-acetylene flame.•The proposed method can be applied for analysis of alkylate, reformate, isomerizate, ethanol as well as commercial automotive and aviation gasoline.
Highlights
The aim of this paper is presentation of a method devoted to organic fluorine determination in gasoline and its components
If fluorine is present in solution, gallium monofluoride is formed in the flame, which is used as a target molecule, absorbing radiation at selected, specific wavelength
It is possible that the presence of sample in the aspirated solution can significantly change the appearance of flame and baseline, as well as can influence the signal for 100 mg L−1 of F
Summary
The method relies on sample dilution in xylene, with addition of necessary reagents and standards and aspiration of the solutions into flame of high-resolution continuous source absorption spectrometer. If a laboratory uses atomic absorption spectrometer in the high-resolution continuum source version, there is the possibility to widen the equipment application range for determination of fluorine, according to the proposed method, by measurement of absorption by the GaF molecule. Control solution 2, CS2, a solution containing 100 mg L−1 of F (as HFB), GaAA and blank sample (diluted 1:10 v:v) in xylene.
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