Results are reported on near-i.r. absorption spectra of H2O in the presence of a variety of electrolytes, in the temperature range of liquid state. Spectra are analysed by using a deconvolution method, presented and discussed in previous works, thus obtaining a new level of detail and completeness of information. This allows for the first time the separation of solute perturbation on the solvent structure in terms of electric-field effects (common to all solutes), steric effects (mainly determined by the ionic radius) and more subtle effects due to the electronic structure of the specific ion. The quantitative set of spectroscopical parameters obtained for the different solutions in the whole explored temperature range offers a potentially useful ground for comparison with results of computer simulation.