. Journal . o be sogreat that the presence of alkali carbonate in tap watercan ba easily recognised.—A. S. Carbonic Acid in the presence of Sulphites, Sulphides, ■and Organic Substances ; Determination of . U. Stanek and J. Milhauer. Zeits. Ver. deutsch. Zucker- ind., 19D3, 53, [572], 958 — determination of carbonates in presence of sulphitesin sugar factory precipitates and deposits is interfered withhv the sulphur dioxide evolved during the analysis, andthe use of oxidising agents is inadmissible, since organicsubstances, such as oxalic acid, give off carbon dioxide underthis treatme
. Journal . o be sogreat that the presence of alkali carbonate in tap watercan ba easily recognised.—A. S. Carbonic Acid in the presence of Sulphites, Sulphides, ■and Organic Substances ; Determination of . U. Stanek and J. Milhauer. Zeits. Ver. deutsch. Zucker- ind., 19D3, 53, [572], 958 — determination of carbonates in presence of sulphitesin sugar factory precipitates and deposits is interfered withhv the sulphur dioxide evolved during the analysis, andthe use of oxidising agents is inadmissible, since organicsubstances, such as oxalic acid, give off carbon dioxide underthis treatment. The authors method is to drop dilute hydrochloric acid(1 in 5) on the mixture of carbonate and sulphite, and pa«sthe evolved gases over moist granulated iodine to retain thesulphur dioxide. The carbon dioxide is freed from anyiodine it has carried over by passing it over aluminiumturnings, and dried over calcium chloride and anhydrouscopper sulphate, and then absorbed by solution of , !i The apparatus used is a moditied form of Messengers :«is the decomposition flask ; the side capillary <:■ allows ofair being drawn through at the end of the reaction ; h con-tains the dilute hydrochloric acid, and i contains the iodine,granulated by being melted in a test-tube and poured intocold water. After each test the iodine is washed with water,and run off ;it c; d contains the aluminium sbaviicalcium chloride, g pumice saturated with anhydrous coppersulphate, and h the caustic potash solution. Sulphuretted hydrogen is equally well retainedby theiodine.—L. J. de W. Pei sulphates; Determination of . C. Marie and Bunel. Bull Soe. Chim., 1903, 29, [181, 930—933. 0-3—0-4 gism. of the alkali persulphat Ived in 100 of water and neutralised in presence of methylorange; 2 of methyl alcohol an tion is heated for five minutes at 70°—80 C.,aud is finallyboiled for ten minutes and titrated with decinormal sodiumhydroxide solution, methyl orange
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
