Method for measurement of impurities in liquids
AssigneeLiquid Air Corporation
InventorsGerhard Kasper, Horng Y. Wen
Life of this patent
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Abstract
Method and apparatus for the measurement of sub-ppm concentrations of impurities in liquids. The liquid to be measured for impurities is dispersed into uniform droplets of a precisely known diameter D in a gas stream, such as air, using for example, a vibratory orifice generator. The dispersed droplets evaporate in the gas stream to leave a residue particle having a diameter d, which can be measured for example by means of a laser light scattering spectrometer. The concentration by volume, C.sub.v, of the impurities can then be calculated according to the equation; C.sub.v =(d/D).sup.3.
Claims11
A method for the rapid measurement of the concentration by volume of sub-ppm levels of dissolved impurities in a liquid comprising:
- providing a liquid containing dissolved impurities;
- dispersing said liquid in a gas stream to generate uniform droplets of precisely known diameter D;
- evaporating said droplets while they are carried in said gas stream so that each droplet leaves a residue particle having a diameter d;
- measuring the diameter d of the residue particles;
- and
- calculating the concentration by volume, C.sub.v, of the dissolved impurities in the liquid according to the equation:
- C.sub.v =(d/D).sup.3.
Dependencies are inferred from the claim text.