Influence of Inorganic Salts on the Refraction Index of Water

Abstract:

The refractive index of double-distilled water and inorganic salt solutions of concentrations varying from 0.4 to 100 ppt (‰) have been measured at 20 Celsius degrees using Abbe refractometer, respectively. The inorganic salts such as NaCl, MgSO4, KCl and MgCl2,these forming the major constituents of seawater are used as solutes of the water solution. The effect of the concentration of these constituents on the refractive index of the solution is experimentally investigated. And meanwhile, the index of refraction studies are carried out for the laser wavelength of 405nm, 450nm, 532nm and 633nm under the case of varying concentration. The results show that the refractive index of the solution will be linearly increased with the increase of the concentration of these constituents. The index of refraction differs for the different solutes when their concentration is same at a certain wavelength.

• Periodical: Applied Mechanics and Materials (Volumes 716-717)
• Pages: 118-121
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.716-717.118
• Online since: December 2014
• Authors: Xin Yi Zhao*, Yu Feng Peng, Cong Cong Zhai, Xue Yun Han, Yi Zhang
• Keywords: Refractive Index, Seawater, Solution Concentration, Underwater Laser Propagation

References

[1] Hirschberg, Joseph G., et al. Speed of sound and temperature in the ocean by Brillouin scattering, J.  Applied optics 23. 15: 2624-2628 (1984).

DOI: 10.1364/ao.23.002624

[2] Haltrin, Vladimir I. Chlorophyll-based model of seawater optical properties, J. Applied Optics 38. 33: 6826-6832 (1999).

DOI: 10.1364/ao.38.006826

[3] Liu, Dahe, et al. Measurements of sound speed in the water by Brillouin scattering using pulsed Nd: YAG laser., Optics communications 203. 3: 335-340 (2002).

DOI: 10.1016/s0030-4018(02)01181-1

[4] Somaraju, Ram, and Jochen Trumpf. Frequency, temperature and salinity variation of the permittivity of seawater., Antennas and Propagation, IEEE Transactions on 54. 11 (2002): 3441-3448 (2002).

DOI: 10.1109/tap.2006.884290

[5] Joshi, A. S., S. S. Deshpande, and M. L. Kurtadikar. DIELECTRIC PROPERTIES OF NORTH INDIAN OCEAN SEAWATER AT 5 GHZ., International Journal of Advances in Engineering & Technology 1. 6 (2012).

[6] Quan X, Fry E S. Empirical equation for the index of refraction of seawater[J]. Applied Optics, 1995, 34(18): 3477-3480.

DOI: 10.1364/ao.34.003477

[7] Seaver G A. The Index of Refraction to Specific Volume Relation for Sea Water-a Linearized Equation of State[J]. Journal of physical oceanography, 1985, 15(10): 1339-1343.

DOI: 10.1175/1520-0485(1985)015<1339:tiorts>2.0.co;2

[8] Wang, Peiming, and Andrzej Anderko. Computation of dielectric constants of solvent mixtures and electrolyte solutions., Fluid Phase Equilibria 186. 1: 103-122 (2001).

DOI: 10.1016/s0378-3812(01)00507-6

[9] Zhang, Xiaodong, et al. Scattering by solutions of major sea salts., Optics express 17. 22: 19580-19585 (2009).

DOI: 10.1364/oe.17.019580

[10] Man'kovsky, V. I. Spectral contributions of the components of seawater to the beam attenuation coefficient in surface waters of the Mediterranean Sea., Physical Oceanography 21. 5: 305-319 (2012).

DOI: 10.1007/s11110-012-9124-z

[11] Matthaus W. 'Empirische Gleichungen fur den Brechungsindex des Meerwassers[J]. Beitr. Meereskd, 1974, 33: 73-78.

[12] N. G. Jerlov, Marine Optics, Vol. 14 of Elsevier Oceanography Series (Elsevier, Amsterdam, 1976).

DOI: 10.1016/s0422-9894(08)70792-x

[13] R. W. Austin and G. Halikas, 'The index of refraction of seawater, ', SIO Ref. 76-1 (Scripps Institution of Oceanography, La Jolla, Calif., 1976).

[14] G. Seaver, 'The optical determination of temperature, pressure, salinity and density in physical oceanography, ', Mar. Technol. Soc. J. 21, 69–79 (1987).