17.08.2015   IAEA RADIATION TECHNOLOGY SERIES No

III.3. ANALYSIS OF RADIOLABELLED (14C or 35S) SCN — IN SAMPLES OF PRODUCED WATER

111.3.1. Method

The tributylphosphate solvent extraction method was developed for 14C or 35S labelled SCN- enrichment. The recovery efficiency of S14CN — or 35SCN- is about 90%. The enriched sample is measured by liquid scintillation counting. Essentially, the method consists of three steps: [4] [5] [6]

lOOOmLbrine

Filtration by 0.45 a m filter paper

Add 5g ZnCI2, 0.1g KSCN and 1mol HCI

Add 10mLTBP and stir 30 minutes

i

Keep to phase separation

Take 8mLof the upper phase +12 mLcocktail (ULTIMA-GOLD LLT) for LSC

FIG. 91. Analytical procedure for analysis of radiolabelled SCN in samples of produced water.