. Bulletin . an monoxide in gas samples Method of analysis Sample No. Method of analysis Sample No. Combus-tion Iodinepentoxide Combus-tion Iodinepentoxide 1. 2 3 Per cent .10 .10 Per cent .095 .082 4 5 6 ---- Percent .07 .02 Per In making the above analyses by the iodine pentoxide method 400c. c. of sample was used. The purifying train consisted of fourwashing bottles; two contained concentrated sulphuric acid and theother two potassium hydroxide solution. One determination re-quired about 21^ hours. ANALYSIS OF MINE ATMOSPHERES 65 IODINE PENTOXIDE APPARATUS
. Bulletin . an monoxide in gas samples Method of analysis Sample No. Method of analysis Sample No. Combus-tion Iodinepentoxide Combus-tion Iodinepentoxide 1. 2 3 Per cent .10 .10 Per cent .095 .082 4 5 6 ---- Percent .07 .02 Per In making the above analyses by the iodine pentoxide method 400c. c. of sample was used. The purifying train consisted of fourwashing bottles; two contained concentrated sulphuric acid and theother two potassium hydroxide solution. One determination re-quired about 21^ hours. ANALYSIS OF MINE ATMOSPHERES 65 IODINE PENTOXIDE APPARATUS USING LIQUID AIR More recent tests by Teague ^^ in connection with the investigationof the physiological effects of motor exhaust gas showed that theabove method was subject to error if gasoline vapor or other heavyunsaturated-hydrocarbon vapors were present. These impurities,however, seldom exist in mine atmospheres, but when they do Teaguefound it necessary to purify the gases before they reached the iodine. FiGUBB 23.—Iodine pentoxide apparatus for determination of carbon monoxide, usingliquid air to remove impurities pentoxide tube by passing them through a bath containing liquidair. Figure 23 shows a diagram of the apparatus. The iodinepentoxide tube was made of three-fourths-inch pj^ex tubing 10inches long and was filled with alternate layers of glass wool andiodine i)entoxide, totaling 30 to 40 grams. The arm of the exit sideof the U tube was somewhat longer than the other and tapered tomake an interlock glass joint with the guard tube. A similar jointwas made with the absorption bulb, thus removing the possibility of Teague, M. C, The determination of carbon monoxide in air contaminated witlimotor exhaust gas: Jour. Ind. Eng. Chem., vol. 12, 1920, p. 964: 66 SAMPLING AND EXAMINATION OF GASES error due to rubber connections. To condition the iodine pentoxide,raise the temperature of the bath from 220° to 230° C. for severalhours, while air is drawn through. Iodine pe
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