This work aims to quantify sulfate ion concentrations in the system Na2SO4-H2O using Raman micro-spectroscopy.Raman spectra of sodium sulfate solutions with known concentrations were collected at ambient temperature(293 K) and in the 500 cm1-4000 cm-1 spectral region.The results indicate that the intensity of the SO42- band increases with increasing concentrations of sulfate ion.A linear correlation was found between the concentration of SO42-(c) and parameter I1,which represents the ratio of the area of the SO42- band to that of the O-H stretching band of water(As/Aw):I1=-0.00102+0.01538 c.Furthermore,we deconvoluted the O-H stretching band of water(2800 cm-1-3800 cm-1) at 3232 and 3430 cm-1 into two sub-Gaussian bands,and then defined Raman intensity of the two sub-bands as ABi(3232 cm-1) and AB2(3430 cm-1),defined the full width of half maximum(FWHM) of the two sub-bands as WB1(3232 cm-1) and WB2(3430 cm-1).A linear correlation between the concentration of SO42-(c) and parameter I2,which represents the ratio of Raman intensity of SO42-(As)(in 981 cm-1) to(AB1+AB2),was also established:I2=-0.0111+0.3653 c.However,no correlations were found between concentration of SO42-(c) and FWHM ratios,which includes the ratio of FWHM of SO42-(Ws) to WB1 WB2 and WB1+B2(the sum of WB1 and WB2),suggesting that FWHM is not suitable for quantitative studies of sulfate solutions with Raman spectroscopy.A comparison of Raman spectroscopic studies of mixed Na2SO4 and NaCI solutions with a constant SO42- concentration and variable CI- concentrations suggest that the I\ parameter is affected by CI-,whereas the I2 parameter was not.Therefore,even if the solution is not purely Na2SO4-H2O,SO42- concentrations can still be calculated from the Raman spectra if the H2O band is deconvoluted into two sub-bands,making this method potentially applicable to analysis of natural fluid inclusions. 相似文献
Inertinite maceral compositions of the Late Permian coals from three sections in the terrestrial and paralic settings of eastern Yunnan are analyzed in order to reveal the paleo-fire events and the atmospheric oxygen levels in the latest Permian. Although the macerals in the studied sections are generally dominated by vitrinite, the inertinite group makes up a considerable proportion. Its content increases upward from the beginning of the Late Permian to the coal seam near the Permian-Triassic boundary. Based on the microscopic features and the prevailing theory that inertinite is largely a by-product of paleo-fires, we suggest that the increasing upward trend of the inertinite abundance in the latest Permian could imply that the Late Permian peatland had suffered from frequent wildfires. Since ignition and burning depend on sufficient oxygen, a model-based calculation suggests that the O2 levels near the Wuchiapingian/Changhsingian boundary and the Permian-Triassic boundary are 27% and 28% respectively. This output adds supports to other discoveries made in the temporal marine and terrestrial sediments, and challenges the theories advocating hypoxia as a mechanism for the Permian-Triassic boundary crisis. 相似文献