Report of the Committee on Editing Tentative and Offical Methods of Analysis, the Association of Official Agricultural Chemists . 9 and subtract it from the totalcarbon to obtain the organic carbon. INORGANIC CARBON. Modified Marr Method.^—Tentative. 7 REAGENTS. (a) N/lO hydrochloric acid. (b) N/lO sodium hijdroxid. (C) Dilute hydrochloric acid.—Dilute 25 cc. of concentrated hydrochloric acid(sp. gr. ) to 250 cc. with carbon dioxid-free water. (d) Barium hydroxid solution.—Prepare a saturated aqueous solution of bariumhydroxid, filter through asbestos into a large container through which a
Report of the Committee on Editing Tentative and Offical Methods of Analysis, the Association of Official Agricultural Chemists . 9 and subtract it from the totalcarbon to obtain the organic carbon. INORGANIC CARBON. Modified Marr Method.^—Tentative. 7 REAGENTS. (a) N/lO hydrochloric acid. (b) N/lO sodium hijdroxid. (C) Dilute hydrochloric acid.—Dilute 25 cc. of concentrated hydrochloric acid(sp. gr. ) to 250 cc. with carbon dioxid-free water. (d) Barium hydroxid solution.—Prepare a saturated aqueous solution of bariumhydroxid, filter through asbestos into a large container through which air freefrom carbon dioxid has been aspirated for some time, and provide an arrangementwhereby the solution may be delivered by air pressure or gravity and kept fromcontact with carbon dioxid by means of soda lime tubes. (e) Carbon dioxid-free water.—Use recently boiled and cooled water, or waterfrom which carbon dioxid has been removed by aeration for a sufficient length oftime with carbon dioxid-free air. Keep in a container provided with a similarattachment as in (d). 8 APPARATUS. HALF FULL OF BEADS ORBROKEN GLASS. FIG. 3. MODIFIED MARR APPARATUS FOR DETERMINING CARBON DIOXID. The apparatus required (Fig. 3), consists of a tube (A), 50-60 cm. long, partlyfilled with beads or broken glass and containing strong potassium hydroxid solution(1 to2), a cylindrical open top separatory funnel (B), capacity 50 cc, marked at 20 and40 cc, the stem of which extends almost to the bottom of the 250 cc. flask (C) into the 20 METHODS OF ANALYSIS IChap. mouth of which is fitted, by means of a rubber stopper, a section of glass tubing 10cm. in length and 1 cm. internal diameter, which in turn is furnished witli a sidetube extending through the condenser jacket (D), and connected by means of a rub-ber stopper to the small trap (K), which is attached to the Meyer absorption appara-tus {E) as shown in the figure. The Meyer absorption apparatus is provided with 2large bulbs, each of about
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