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A simple SPE method for determination of cobalt(II) using a C18 bonded silica membrane disk impregnated with Cyanex 272 has been developed. Cobalt(II) was quantitatively sorbed at pH 6.0 from a sample solution and eluted using 10.0 mL 1.0 M HNO3 prior to its flame atomic absorption spectrometric determination. The influence of eluting agents, the minimum volume and maximum flow rate of the eluent, and interfering ions on cobalt(II) was studied. The method developed for cobalt(II) had an LOD of 1.4 microg/L, and a preconcentration factor > 200 with an RSD of 0.6%. The reusability of the modified disk was for 40 cycles. The method was applied for the determination of cobalt in certified samples, urine, and industrial sludge samples. 相似文献
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Noel Alex Gomes Vikas V. Vaidya Ashutosh M. Pudage Santosh S. Joshi Avdhoot M. Laud Snehal Basagare Jayram A. Tandel 《Chromatographia》2009,69(9-10):1061-1065
A rapid, sensitive and specific method for quantification of methoxsalen in human plasma using metaxalone as the internal standard is presented. An Applied Biosystems Sciex API 3200 triple quadrupole mass spectrometer in multiple reaction monitoring mode, using TurboIonSpray in the positive ion mode was used. Simple solid phase extraction was followed by C18 reverse phase chromatography and tandem mass spectrometry using metaxalone as the internal standard. The mean recovery for methoxsalen was 90.0% with a lower limit of quantification of 1.0 ng mL?1. This validated assay method makes use of the sensitivity and selectivity of tandem mass spectrometry detection to allow for a more rapid and selective method for the determination of methoxsalen in human plasma. 相似文献
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Phase diagram studies of succinonitrile-vanillin system show the formation of 2:1 congruent melting type compound. Crystallization velocities of pure components, succinonitrile-vanillin complex, and two eutectics have been determined at different undercoolings. On the basis of heat of fusion measurements, excess thermodynamic functions have been calculated. Microstructural studies revealed that impurities modify the morphology. FTIR spectral studies and computer simulation have shown the existence of hydrogen bonding in the eutectics and the congruent melting compound. On the basis of experimental results, the mechanism of formation of eutectics and its solidification behavior are discussed. 相似文献
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