The sample is a liquid lipstick. Also, what is the most appropriate ratio of diluent to sample which would have the least impact to the presence of metals in the sample.
Dear Sir. Concerning your issue about the preparing a non-aqueous viscous liquid sample (liquid lipstick) for atomic absorption spectroscopy. Sample preparation is an important step in chemical analysis, from time and reagent consuming point of view and from the probability of errors. Non-aqueous samples can sometimes be run directly, but this depends significantly on their viscosity. In flame atomic absorption spectroscopy (FAAS) analysis, the viscosity should be similar to that of water for which most nebulizers are designed. Only some organic solvents, such as ethanol or methyl isobutyl ketone, fulfill this condition and are consequently often used for dilution of organic liquids, the major drawback, encountered with these techniques is the dilution factor, which reduces the metal content per unit volume. Standards can be prepared in the pure solvent. Elements in organic solvents usually give an FAAS analysis response similar to that given by the same element in aqueous solution. Lipsticks are present in the semi solid form, so pretreatment of samples are required before analysis. For this purpose, 3.0 g of lipstick samples were exactly weighted with electrical analytical balance and put into digestion flask. Lipstick samples were digested by using wet digestion method by repeatedly addition of 10.0 ml of 4:1 HNO3/ HClO4 at interval of 3 minutes for 5 times using the same ratio at atmospheric pressure under open system on hot plate at 100 ºC and heated until the white fumes started evolving, which showed the completion of digestion process. The resulting digestate was filtered with filter paper and transferred to a 100.0 mL capacity volumetric flask and made up to the mark by the addition of doubly distilled deionized water and the concentration of the studied metal ions was then determined by flame atomic absorption spectrometry. Calibration solutions of heavy metals studied in this article were prepared as follows: for Cd ion, 0.0, 0.4, 0.6, 0.8, 1.0 mg L-1 , for Pb ion, 0.0, 2.0, 6.0, 8.0, 10.0 mg L-1 , for Cr ion, 0.0, 0.05, 1.0, 1.5, 2.0,2.5 mg L-1 and for Ni ion, 0.0, 0.5, 1.0, 3.0, 5.0 mg L-1 . I think the following below links may help you in your analysis:
http://pbr.mazums.ac.ir/article-1-126-en.pdf
https://pdfs.semanticscholar.org/2775/63056edadde9c0344d6018654615e7b63cb7.pdf
https://ec.europa.eu/jrc/sites/jrcsh/files/IMEP-35%20EUR%2025838.pdf
http://www.internationaljournalssrg.org/IJME/2017/Special-Issues/ICETSST/IJME-ICETSST-P101.pdf
Thanks
Dear Sir. Concerning your issue about the preparing a non-aqueous viscous liquid sample (liquid lipstick) for atomic absorption spectroscopy. Sample preparation is an important step in chemical analysis, from time and reagent consuming point of view and from the probability of errors. Non-aqueous samples can sometimes be run directly, but this depends significantly on their viscosity. In flame atomic absorption spectroscopy (FAAS) analysis, the viscosity should be similar to that of water for which most nebulizers are designed. Only some organic solvents, such as ethanol or methyl isobutyl ketone, fulfill this condition and are consequently often used for dilution of organic liquids, the major drawback, encountered with these techniques is the dilution factor, which reduces the metal content per unit volume. Standards can be prepared in the pure solvent. Elements in organic solvents usually give an FAAS analysis response similar to that given by the same element in aqueous solution. Lipsticks are present in the semi solid form, so pretreatment of samples are required before analysis. For this purpose, 3.0 g of lipstick samples were exactly weighted with electrical analytical balance and put into digestion flask. Lipstick samples were digested by using wet digestion method by repeatedly addition of 10.0 ml of 4:1 HNO3/ HClO4 at interval of 3 minutes for 5 times using the same ratio at atmospheric pressure under open system on hot plate at 100 ºC and heated until the white fumes started evolving, which showed the completion of digestion process. The resulting digestate was filtered with filter paper and transferred to a 100.0 mL capacity volumetric flask and made up to the mark by the addition of doubly distilled deionized water and the concentration of the studied metal ions was then determined by flame atomic absorption spectrometry. Calibration solutions of heavy metals studied in this article were prepared as follows: for Cd ion, 0.0, 0.4, 0.6, 0.8, 1.0 mg L-1 , for Pb ion, 0.0, 2.0, 6.0, 8.0, 10.0 mg L-1 , for Cr ion, 0.0, 0.05, 1.0, 1.5, 2.0,2.5 mg L-1 and for Ni ion, 0.0, 0.5, 1.0, 3.0, 5.0 mg L-1 . I think the following below links may help you in your analysis:
http://pbr.mazums.ac.ir/article-1-126-en.pdf
https://pdfs.semanticscholar.org/2775/63056edadde9c0344d6018654615e7b63cb7.pdf
https://ec.europa.eu/jrc/sites/jrcsh/files/IMEP-35%20EUR%2025838.pdf
http://www.internationaljournalssrg.org/IJME/2017/Special-Issues/ICETSST/IJME-ICETSST-P101.pdf
Thanks
Amina.. Viscosity has a bad interference against AAS signal. Try your best to use the normally employed solvents like the MIBK and white spirit from any local refinery if you cannot dry ash your samples.... Good luck
- Badges
- Science topic