Coprecipitation of barium with lead sulfate

TAKIYAMA Kazuyoshi, ISHII Yuko

doi:10.2116/bunsekikagaku.28.9_531

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Other Title

均一溶液からの共沈殿の研究　ＸＩＶ　　電子顕微鏡及び回折法による共沈殿の研究　ＸＩＩ　　硫酸鉛に対するバリウムの共沈殿
リュウサンナマリニタイスルバリウムノキョウチンデン
硫酸鉛に対するバリウムの共沈殿
均一溶液からの共沈殿の研究(第14報);電子顕微鏡及び回折法による共沈殿の研究(第12報)

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Description

Coprecipitation of barium with lead sulfate from homogeneous solution by the use of sulfamic acid was studied from the viewpoints of analytical and crystal chemistries. Lead sulfate was precipitated in the solution containing a small quantity of barium, and then the precipitate dissolved in ammoniac EDTA solution was analyzed by the atomic adsorption spectroscopy. The coprecipitation of barium with lead sulfate was found to conform to the Doerner-Hoskins logarithmic distribution law and the distribution constant obtained was 2.33. The particles prepared from the same molar quantity of lead and barium were analyzed by electron microscopy and diffraction methods. In the process of precipitation the shape of particles changed from elliptic to rectangular, the elliptic resembling barium sulfate particles and the rectangular lead sulfate particles, respectively. Each reflection peak of X-ray diffraction of the precipitate finally prepared was found between the corresponding peaks of lead and barium sulfates, but that peak was not sharp-pointed because the barium and lead were not distributed homogeneously in the particles. The coprecipitation of barium with lead sulfate was used to measure the content of barium in water. This showed that one liter of the surface water of sea and river contained 0.15 and 0.01 mg barium, respectively.

Journal

BUNSEKI KAGAKU

BUNSEKI KAGAKU 28 (9), 531-535, 1979

The Japan Society for Analytical Chemistry

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