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• W2065035714 abstract "Abstract This study proposes a procedure for determining sodium, potassium, calcium and magnesium in biodiesel samples by flame atomic absorption spectrometry (F AAS). The sample was prepared as a microemulsion without surfactant. The optimized composition of the microemulsion was 10% (w/v) biodiesel, 75% (v/v) n-propanol, 1% (v/v) concentrated nitric acid and 14% (v/v) of aqueous solution formed by 0.2% (v/v) of nitric acid and 0.5% (v/v) of ionization suppressor. Analyte signals in the samples as microemulsion were found to be stable for a period of 15 days. Analytical curves were obtained using organometallic standard solutions. The limits of detection (LOD) found for the proposed procedure were 0.1 µg g − 1 , 0.01 µg g − 1 , 0.04 µg g − 1 , and 0.004 µg g − 1 for Na, K, Ca and Mg, respectively. The reference method established by ABNT (Brazilian Association of Technical Norms) NBR 15556:2008 was used to verify the accuracy of the proposed procedure. No significant statistical difference was found between the results obtained with the proposed and the chosen reference procedure. The proposed procedure showed no matrix influence when recovery tests were performed (89%–103%). The results found in this study show that the proposed procedure is a good alternative for determining Na, K, Ca, and Mg by F AAS in biodiesel samples." @default.
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• W2065035714 date "2010-09-01" @default.
• W2065035714 modified "2023-10-11" @default.
• W2065035714 title "Determination of Na, K, Ca and Mg in biodiesel samples by flame atomic absorption spectrometry (F AAS) using microemulsion as sample preparation" @default.
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• W2065035714 doi "https://doi.org/10.1016/j.microc.2010.03.005" @default.
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