Eggs. E.M. BAILEY (Connecticut Agric. Ex. Station Bulletin 295,(314)(315) I928) states that large air spaces accompanied by low ammonia content indicate eggs held at low temperatures or in cold storage. Large air spaces accompanied by high ammonia content indicate eggs held under less favorable conditions, e.g., those held too long by either the producer or the retailer.
J. S. H.
Use of Carbon
Tetrachloride plus Air for the Decomposition of Sulphides and Related Compounds. K. BRADDOCK-ROGERS (Thesis, Graduate School, Univ. of Penn., I928, 1-21) has devised the following procedure for the preparation of sulphur-free carbon tetrachloride. He treats 3 parts of carbon tetrachloride with 2 parts of a 1:I mixture of ammonia water and sulphate-free hydrogen peroxide, repeats the treatment several times, dries over calcium chloride, and distils. The entire process is repeated until a product is obtained which is shown to be sulphur-free by the following test. The carbon tetrachloride is kept at a temperature of 60 Β° to 65 Β° C.; one liter of air, free from carbon dioxide and moisture, is drawn through it in 40 minutes; and the gaseous mixture is heated to a temperature of 750 Β° to 800 Β° C., then passed into ammoniacal hydrogen peroxide solution which is free from sulphates. The resulting solution is boiled to expel the excess of ammonia, acidified with hydrochloric acid, and tested for the presence of sulphates with barium chloride solution.
Certain sulphides, selenides, and tellurides were completely decomposed and chlorinated by treating them with a mixture of air and vapor of the sulphur-free carbon tetrachloride at elevated temperatures. Of the sulphides, sphalerite, pyrite, cinnabar, bismuthinite, chalcopyrite, nickel matte, copper matte, and palladous sulphide were decomposed, and their sulphur content rapidly and conveniently oxidized prior to quantitative determination of that element. Pyrrhotite, marcasite, arsenopyrite, stibnite, tetrahedrite, cobaltite, molybdenite, galenite, enargite, sylvanite, and tiemannite were completely decomposed, but the quantitative determination of their sulphur or selenium content was not made. The procedure was also used for the complete decomposition of the selenides, berzelianite and zorgite, and of the telluride altaite, and the quantitative determination of their selenium and tellurium, respectively.
J. S. H.