An Electron Microscopic Study on the Suspensoid for the Nephelometry of Sulfate Ion

Abstract

The electron microscopic observation of suspended particles of barium sulfate revealed that the nephelometric method of the estimation of sulfate ion in water as barium sulfate gives different shape and size by the least change of concentration of sulfate ion. The authors obtained dendritic suspended particles of 0.6 × 0.15μ in size by the formation of the suspension in 50% alcohol and the suspended particles are uniform in shape and size within the limit of concentration of sulfate ion present in natural water. By the use of this method the error of estimation is minimized within several percent. The data of estimation by this nephelometry and by the gravimetric method were discussed.