Solubility of hydrated tin dioxide in water

We have measured the solubility of hydrated tin dioxide (HTD) in highly pure water at 3000C. The tin was determined by solvent extraction and photometry with butylrhodamine C and by neutron activation (limits of detection 0.3 and 0.6 μm of tin in the sample, respectively. To determine the tin by neutron activation, we irradiated the water concentrate along with standard solutions of tin containing 50 μg of tin per sample in silica tubes at an epithermal neutron flux density of 6 x 1012 neutrons/cm2 x sec for a week. After the irradiated specimens had been allowed to cool, 50 μg of tin was added and the tin was separated radiochemically with PAN. The extraction proportion was 90%. The gamma activity from /sup 113m/Sn (T/sub 1/2/ = 119 days, E = 392 keV) was measured with a germanium-lithium spectrometer. The count rate in the /sup 113m/Sn region was 31 counts/μg x min on measurement at the surface of the detector