A Manual of Cement Testing for the Use of Engineers And Chemists in Colleges An
A Manual of Cement Testing for the Use of Engineers And Chemists in Colleges An
William Allyn Richards
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More hot water is added and the whole is agitated until disintegration is complete. The solution is then filtered, the filtrate is acidified with HC1 and diluted to about 250 c. C. It is then heated to boiling and the S0 3 is pre- cipitated as BaS0 4, by the addition, drop by drop, of a boiling solution of BaCk as previously described in the de- termination of sulphuric acid. The precipitate is filtered, washed, ignited and weighed as described in the same place. The weight of BaSO 4 obtained, ...multiplied by the factor 0. 1374, gives total sulphur. Bromine Method. This method depends upon the oxida- tion of S to 80s by means of Br water. Weigh out i gram * As the reagents here used, Na2COs and KNOs, are liable to contain sulphur, a blank should be run first. Results of subsequent analyses can then be corrected for the amount found. 96 CEMENT TESTING of the sample into a porcelain evaporating dish or casserole and treat with Br water in excess. Allow to digest on the water bath for 10 or 15 minutes, then acidify with HC1 and evaporate to dryness.
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