226RA analysis in sea and river water by adsorption on specific adsorbers.
A method to analyse 226Ra in sea water Ra in sea water was investigated. The chemical procedure is based on adsorption of radium and barium, used as a carrier, on the specific adsorber PRTD at pH 9.5. The main interference is due to magnesium. The magnesium concentration is depleted by precipitating barium (carrier) and radium with calcium carbonate at pH 8 before the adsorption step. The proposed chemical procedure is simple and easily performed. The overall chemical yield is evaluated on the basis of the 133Ba spike. The sensitivity of the method is related to the volume of sea water. Under the experimental conditions used, 5 L of sea water, the limit was 1 226Ra mBq/L of water. The method may be also applied to the analysis of radium in river water, by omitting the carbonate precipitation.
Valentini Ganzerli
Maria Teresa
MT
Dipartimento di Chimica Generale e Centro di Radiochimica ed Analisi per Attivazione-Università di Pavia, Viale Taramelli 12, 27100 Pavia. elisa@unipv.it
Maggi
Luigino
L
Crespi Caramella
Vera
V
D000327:Adsorption; D011232:Chemical Precipitation; D002623:Chemistry Techniques, Analytical; D008274:Magnesium / Q000737:chemistry; D011883:Radium / Q000032:analysis* / Q000737:chemistry; D012680:Sensitivity and Specificity; D014875:Water Pollutants, Radioactive / Q000032:analysis*
D014875:Water Pollutants, Radioactive; D008274:Magnesium; D011883:Radium