¹⁷O NMR and Raman spectra of water with different calcium salts

¹⁷O NMR and Raman spectra of water with different calcium salts have been measured. Different water samples were prepared by adding nano-materials, calcium gluconate, calcium citrate and calcium chloride into distilled water. Both ¹⁷O NMR and Raman spectra of different water samples were recorded. The effects of temperature and time on ¹⁷O NMR line-width of different water samples were analyzed as well. The experimental results showed that Raman spectra of water with these four calcium salts were almost the same as those for distilled water when the temperature increased to 40 °C. The ¹⁷O NMR line-width of distilled water decreased from 76.8 Hz to 46.9 Hz and 65.8 Hz after nano-materials and calcium chloride were added, respectively. Besides, the ¹⁷O NMR line-width of distilled water increased from 76.8 Hz to 131.6 Hz after calcium citrate was added, while the ¹⁷O NMR line-width of distilled water increased from 76.8 Hz to 77.2 Hz after calcium gluconate was added. The ¹⁷O NMR line-width of water with calcium chloride increased while the other three water samples were nearly stable as the temperature increased from 30°C to 85°C. The ¹⁷O NMR line-width of water with nano-materials kept steady while the ¹⁷O NMR line-width of the other three water samples all increased in 42 days.