Google
 

PENENTUAN KADAR ARSEN DALAM BERMACAM-MACAM TONIKUM DENGAN CARA ANALISA PENGAKTIPAN NETRON

>

A method had been worked out for the determinotion of arsenic in tonics using the neutron radioactivation analysis technique. After irradiating the sample and the standard in a reactor with a flux of 1012 n/cm2/sec for two hours, it is extracted in dilute NaOH solution with heating to transform the arsenic into the soluble sodium arsenite and filtered. After adding arsenic_carrier and dilute HCI to make the pH ±. 3, the arsenic is precipitated as As2S3 by H2S. The precipitate is weighed after washing with acetone and drying under an I.R. lamp, and the activity is analysed using a single channel gamma scintillation spectro_meter in which a solid, 2 1/2 x 2 1/2 inch, Nal (Thallium activated) crystal served as the detector. The presence of Mn and Cu makes the anal ysis for arseni c rather high and in this case a further radiochemi cal separation has to be done. HITLER NATASUWARNA. POEY SENG BOUW dan DJALI AHIMSA *)laboratori um Rodiopharmacy, Pusat Reaktor Atom Bandung. Penyelidikan ini dibantu dengan grant dari DURENAS.