石灰石中のカルシウム定量に際しての諸条件の検討
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In the volumetric determination of calcium in limestone with permanganate titration, the various conditions have been studied for a method without the separation processes of co-existing elements such as dehydration of silica and reprecipitation of calcium oxalate. The results obtained can be summarized as follows:<BR>(1) On the washing of the precipitate of calcium oxalate, it was found that the diffrence between the use of ice cold water (05°C) and water of normal temperature (21°C) was very little, and satisfactory results were given by washing 8 to 14 times using 10 m<I>l</I> of water each time. When washing was done with hot water (70±5°C), the titration results were scattered.<BR>(2) Among the filter paper used in the investigation, it was found that Toyo Filter Paper No 5B or a paper with similar texture was suitable, but Toyo Filter Paper No. 5A, a rapid filtering paper of loose texture, required a greater number of washings.<BR>(3) After washing the precipitate, satisfactory results were obtained by the following procedure: transfer the precipitate to a beaker and dissolve it in dilute sulfuric acid. After the titration with permanganate, add the paper used in filtration to the solution, and continue the titration to obtain the true end point.<BR>(4) The effect of co-existing elements of amounts such as are involved in ordinary limestone was not great even without reprecipitating treatment.<BR>(5) Ignition treatment of the sample to destroy organic matter and to render the calcium in the siliceous material more easily soluble in acid was practically unnecessary for the samples tested.
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- 石灰石中のカルシウム定量に際しての諸条件の検討