| 摘要 |
1416448 Precipitating apparatus E I DU PONT DE NEMOURS & CO 26 Oct 1972 [28 Oct 1971] 49406/72 Heading B1X [Also in Division G1] A method of preparing a liquid sampe for analysis by optical means whereby an interfering substance can be selectively removed therefrom comprises passing the sample through a receptacle which is at least partially packed with substantially rigid porous particles the greatest dimension of each of which is between 37 and 125 microns and having a mean pore diameter (within Π10% of which fall the diameters of at least 80% of the pores) of 150 to 1375A, and in which at least some of the pores of the particles and the spaces between the particles contain a substance that is capable of precipitating the interfering substance but not the substance or substances to be analytically determined, from the sample. The process is applicable to the removal of proteins from samples of body fluids using glass beads containing in their pores acetone, ethanol, ammonium sulphate solution, aqueous solutions containing mercuric, ferric, zinc, cadmium, lead or cupric ions, or trichloracetic tungstic, metaphosphoric or perchloric acid. |
