Manual of chemical analysis as applied to the examination of medicinal chemicals : a guide for the determination of their identity and quality, and for the determination of their identity and quality, and for the detection of impurities and adulterations : for the use of pharmaceutists, physicians, druggists, and manufacturing chemists, and of pharmaceutical and medical students . Fig. 78. but small traces of the constituents of the oil. The obtaineddistillate is mixed with a little iodine-water ; if chloroform bepresent, and no alcohol, it will absorb the iodine, and separate,with a rose-colo
Manual of chemical analysis as applied to the examination of medicinal chemicals : a guide for the determination of their identity and quality, and for the determination of their identity and quality, and for the detection of impurities and adulterations : for the use of pharmaceutists, physicians, druggists, and manufacturing chemists, and of pharmaceutical and medical students . Fig. 78. but small traces of the constituents of the oil. The obtaineddistillate is mixed with a little iodine-water ; if chloroform bepresent, and no alcohol, it will absorb the iodine, and separate,with a rose-color. The colorless, aqueous liquid is decanted,and then warmed by dipping the test-tube in warm water ; onedrop of solution of iodinized potassium iodide is added, andthen one drop of liquor potassse, or so many as nearly to decol-orize the liquid. If alcohol be present, minute yellow crystals. OLEA. 277 of iodoform will be produced (Fig. 79), which, after subsiding,in a conical glass, may be recognized by the examination ofthe sediment under the microscope. Nitrobenzol may be detected bydissolving 15 grains of fused potassiumhydrate in about two fluid-drachms ofalcohol; the solution may be aided bydipping the test-tube into hot water;when it is complete, from 15 to 20drops of the oil are added, and theheating continued for a minute ; if fig. t9. the oil be pure, the mixture will re-main colorless or nearly so, and will form, on cooling, a white,crystalline deposit of potassium benzoate ; if it is contaminatedwith nitrobenzol, the liquid will assume a dark-brown color. Or the oil may be tested by agitating about one drachm ofit with half a drachm of fused potassium hydrate. If nitroben-zol is present, the yellow color of the oil will give place to a redtint, which passes into green, if much nitrobenzol is present;the green color disappears after about twelve hours and return
Size: 1578px × 1583px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1, bookdecade1870, booksubjectpharmaceuticalchemistry
