Procedures for Precipitation of Fission Products and | Calicium-Strontium (2) (2) The sea water was acidified and stirred to remove bicarbonates. Ferric chloride was added and precipitated by addition of ammonium hydroxide. coagulate. The precipitate was allowed to (3). Saturated ammonium oxalate solution was added to the solution to precipitate oxalates and the solution allowed to stand several hours. (4) The combined precipitates were filtered and the filter paper with precipitate returned to the laboratory. Processing in the laboratory was as follows: (5) The filter paper and precipitate was ashed at 600°C (6) The ash was dissolved in dilute hydrochloric acid. (7) The iron which had previously been added was reprecipitated by addition of emmonium hydroxide. This precipitate, which is believed to contain most of the fission products of the sample,was plated and counted. (8) The alkaline filtrate was diluted to 100 mls and dup- (9) The aliquots were diluted to 100 mls and calcium and strontium reprecipitated by addition of saturated ammonium oxalate solution. The precipitate was plated and counted. to destroy the paper and convert oxalates to oxides. Solution was complete. licate 20-ml aliquots taken. The half-liter post shot samples were brought to the Laboratory for all the processing. The method was slightly differ- ent from that used in the field and was as follows: (1) The sample was acidified and stirred to remove bi- (2) Ferric chloride was added and reprecipitated as fer- carbonates. ric hydroxide by addition of ammonium hydroxide. The - 125 - g, be