Effect of Minerals Dissolved in Water on Half-width of NMR Spectrum

An EQR irradiation causes a half-width(Hw)change of "0-NMR spectrum of a mineral water. But the difference of Hws before and after EQR irradiation depends on a kind of water. The Hw strongly depends on the pH value. Then pH change must be considered to study the effect of EQR irradiation on mineral waters. However, pH values of mineral waters placed in the laboratory under the same condition do not change so much, indicating that the half-width change by EQR irradiation is the result of the structural change of the mineral water.