8 EXPERIMENT STATION RECOED. 



ubs. in Analu>it, 3J, (lUOU), No. 3V5, i). 7o, fig. 1; Ann. Vltini. Analyt.. IJf (1909), 

 No. 3. PI). 109-111, fig. 1; Jour. Chem. Hoc. [London^, 96 (1909), No. 556, II, 

 I)/). ISI, 7,S..\ fig. 1; Chem. Zcnthl., 1909, I, No. 6, p. J/IS). 



The determination of caustic lime in presence of carbonate of lime, Heyeb 

 (Chem. Ztg., 33 {1909), No. 12, pj). 102, 103; ahs. in Ztschr. Angcw. Chem., 22 

 {1909), No. 10, p. ■'i',9; Jour. Chem. Soc. [London^, 96 (1909), No. 557, II, p. 

 267 ; Chem. Zentbl., 1909, I, No. 9, p. 789). — The author describes an auimoniiim 

 chlorid niethod which he has used successfully for several years for the deter- 

 mination of caustic lime, calcium hydroxid, and calcium saccharate. in presence 

 of carbonate, sulphate, or phosphate of calcium. It is based upon the fact that 

 calcium carbonate will not drive off ammonia from ammonium chlorid unless 

 the solution is heated. The material to be tested is shaken up with 2 per cent 

 aunnonium chlorid solution and the resulting solution is titrated with teuth- 

 nornial acid. 



Determination of small amounts of lime in presence of large amounts 

 of magnesia, F, Hundeshagen {Ztschr. OtfcntJ. Chem., 15 {1909), No. 5, pp. 

 85-93; (lbs. in Ztschr. Angcw. Chem., 22 {1909), No. 18, p. 836; Analyst, 3.'f 

 {1909), No. 398. pp. 2.'i0, 2'i1). — The essential features of the method proposed 

 for the separation of calcium and magnesium are to dissolve 1 gm. of the ma- 

 terial by boiling 10 to 15 minutes in SO cc. of 5 to 6 per cent hydrochloric acid, 

 remove the insoluble residue by filtration, and evaporate to dryness on the 

 water bath. Add 4 gm. of Glauber's salts and 30 cc. of warm water and mix 

 with constant stirring with 40 cc. of 90 per cent alcohol. On standing from 

 4 to 5 hours the calcium sulphate crystallizes out and may be freed from mag- 

 nesium salts by repeated deeantation with 50 per cent alcohol. 



The volumetric determination of phosphoric acid, monoalkali, and dialkali 

 phosphates, J. M. Wilkie {Jotir. Soc. Chem. Indus., 28 {1909), No. 2, pp. 68, 69; 

 abs. in Analyst, 3.^ {1909), No. 397, pp. 179, ISO; Jour. Chem. Soc. [Londoni, 

 96 {1909), No. 5.57, II, pp. 266, 267; Chem. Zentbl., 1909, I, No. 13, pp. 111.',, 

 1115). — The method proposed is based upon precipitation of the phosphoric acid 

 as silver phosphate by means of silver nitrate in presence of excess of sodium 

 acetate, then titrating directly the acetic acid .set free with tenth-normal 

 barium hydroxid in presence of phenolphthalein. The adaptation of the method 

 to monoalkali and dialkali phosphates and its modification in presence of car- 

 bonates are explained. 



The development of methods of analysis of Thomas slag, M. Popp {Chem. 

 Ztg., 33 {1909). Nos. 29, pp. 262, 263; 30, pp. 277,, 275; 31, pp. 283, 28//).— The 

 various methods proposed for this purpose are reviewed. 



A practical modification of the method of determining hardness in water, 

 F. Telle {Ann. Chim. Analyt., 13 (1908), No. 10, pp. 38',-390; abs. in Ztschr. 

 Angen: Chem., 22 {1909). No. 10, p. /,.',9).— The modification consists in using 

 such proportions of reagents and solutions that the readings will give directly 

 the amounts of calcium carbonate per liter. 



The influence of chlorids on the determination of nitrates in water, (i. 

 Perkier and L. Farci' {Bui. Soc. Chim. France, 4. ser., 5 (1909), No. J,, pp. 178- 

 180; Ann. Chim. Analyt., 1 <, (1909), No. 6, pp. 213-215; abs. in Analyst, 3', 

 (1909), No. 397, p. 17-',; Ztschr. Anqew. Chem., 22 (1909), No. 16, p. 738; Chem. 

 Zentbl., 1909, I, No. 13, p. 111/,).— In view of the error which the presence of 

 chlorids causes in the determination of nitrates in water in the Grandval and 

 Lajoux method, the author proposes a simple modification which consists of 

 adding to the type sample used for comparison of colors a quantity of chlorin 

 equal to that found to be present in the water examined. 



Notes on the determination of nitrates by the Grandval and Lajoux 

 method, M. Lombard and J. Lafoke (Hul. Soc. Chim. France, f ser., 5 (1909), 



