US EPA

1462916 

Journal Article 

Spectrophotometric determination of water content in alcohol organic solvents 

Hai-Xin Bai; Xiu-Rong Yang 

2007 

Yes 

Journal of the Chinese Chemical Society
ISSN: 0009-4536 

54 

3 

619-624 

English 

WOS:000248925000009 

In this work, the absorption spectral characteristics and color-change reaction mechanism of cobalt(II) chloride(COCl2) in alcohol organic solvents has been investigated in the presence of water, and then the optimum conditions for determining the water content in the solvents were selected. Results indicated that the absorption spectra Of COCl2 in alcohols decreased with the increment of water content. At the maximum absorption wavelength of 656 nm, there were good linear relationships between the logarithm of the absorbance and the water content in organic solvents such as ethanol, n-propanol, iso-propanol and n-butanol with related coefficients in the range of 0.9996 similar to 0.9998. For determining water content in organic solvents, this method is simple, rapid, sensitive, reproducible and environmentally friendly. Furthermore, the linear range cannot restrict determination of the water content in organic solvents. This method had been alied to determine the water content in ethanol and n-butanol with satisfactory recovery of water in n-butanol between 98.41%-101.29%. 

water; cobalt(II) chloride; color-change reaction; spectrophotometric method