Hydrochloric acid digestion

Hydrochloric acid digestion takes place at elevated temperatures and produces a solution of the mixed chlorides of cesium, aluminum, and other alkah metals separated from the sUiceous residue by filtration. The impure cesium chloride can be purified as cesium chloride double salts such as cesium antimony chloride [14590-08-0] 4CsCl SbCl, cesium iodine chloride [15605 2-2], CS2CI2I, or cesium hexachlorocerate [19153 4-7] Cs2[CeClg] (26). Such salts are recrystaUized and the purified double salts decomposed to cesium chloride by hydrolysis, or precipitated with hydrogen sulfide. Alternatively, solvent extraction of cesium chloride direct from the hydrochloric acid leach Hquor can be used. 

Method 1 Hydrochloric acid digestion sulfur apparatus (for acid-digestible inorganic sulfur) with digestion-distillation flask [73]. 

An official method has been published for the determination of magnesium in plant material [27]. A hydrochloric acid digest of the sample is treated with strontium chloride perchloric acid releasing agent and magnesium is determined by AAS using the 285 nm emission line. See Sect. 7.34.1. 

Recovery of rare earths as chlorides by hydrochloric acid digestion of bastnasite is illustrated in Fig 1.5. 

Wastes/soil/ groundwater Nitric acid digestion or nitric/peroxide/hydrochloric acid digestion AA, furnace 3x1 O 9 g/mL 100.5% EPA 1997b (method 7742)... 

Centurione and Kihara (1994) tested the application of F.L. Smidth s burnability equations and methods, including those of Fundal (1979), Theisen (1992), and Miller (1980), in an analysis of 12 samples of raw feed and corresponding clinkers. Cenfurione and Kihara used an hydrochloric acid digestion mefhod fo calculate Cj25 and concluded that coarse quartz (>45 pm) and limestone (>125 pm) should not exceed 2% and 6%, respectively, by weight of sample. 

Methods for recovering lignin are the alkali process, the sulfite process, ball milling, enzymatic release, hydrochloric acid digestion, and organic solvent extraction. Alkali lignins are produced by the kraft (22) and soda (23) methods for wood pulping. These... 

A method involving hydrolysis of bacterial cellulose by sulfuric acid has been undertaken in order to obtain nanowhiskers. These nanowhiskers can be dispersed in various solutions, however the nanowhiskers appear stiff and rod-like, and have been reported to aggregate to some degree [146]. Bacterial cellulose nanowhiskers have also been pre-pared by hydrochloric acid digestion [147]. 

Fluid secreted by the stomach containing hydrochloric acid, digestive enzymes (for example pepsinogen) and intrinsic factor which is necessary for vitamin B 2 absorption. Gastric juice secretion is stimulated by gastrin and also by the vagus nerve which responds to the stimulus of food. 

---