科研之友
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摘要
If the solution concentration c and the spectral absorbance A is not obeyed Lambert-Beer's Law, an individual solution sample should be prepared and acquired in order to obtain its infrared spectrum. The binary linear regression analysis and hybrid spectrum were applied to NaCl aqueous solution. The following conclusions have been reached : (1) The infrared spectra of NaCl aqueous solutions with concentrations of c(1), c(2) are A(c1), A(c2), respectively. Then the regression equation A(hc) (c(1), c(2)) = (a) over capA(c1) + (b) over capA(c2) is set up, where the relationship among c(1), c(2) and c is c(1)<c<c(2). Hybrid spectrum A(hc) (c(1), c(2)) can be very similar to real spectrum A(c )if (a) over cap and (b) over cap values are selected properly. (2) The smaller difference between c(2) and c(1), the higher similarity between A(hc) (c(1), c(2)) and A(c) is. (3) The regression equation A(hc) (2%, 30%) = (a) over capA(2%) + (b) over capA(30%) can be applied to the concentration range 2%similar to 30%. (4) The relationships between (a) over cap and c, (b) over cap and c are c= - 3. 592c+1. 058 9 and (b) over cap= 3. 565c-0. 055 15. If we select c, we can easily obtain (a) over cap and (b) over cap then (a) over cap and (b) over cap are substituted into regression equation A(hc) (c(1), c(2)) = (a) over capA(c1) + (b) over capA(c2). All hybrid spectra are very similar to the real spectra and they can even replace the real spectra.
