Strontium oxalate

Strontium oxalate (H2O) [814-95-9] M 193.6, m 150 . Crystd from hot water (20mL/g) by cooling. Strontium salicylate [526-26-1] M 224.7. Crystd from hot water (4mL/g) or EtOH. 

The requirements of the US Armed Forces are detailed in Mil Spec MIL-S-12210A, Strontium Oxalate , (11 Sept 1952) Strontium oxalate shall be of the following grades as specified Grade A — anhydrous strontium oxalate Grade B — hydrated strontium oxalate, and shall conform to the physical and chemical properties listed in Table 1... 

Strontium oxalate shall be free of barium compounds, and shall contain not more than a slight amount of calcium compds. Conformance with these requirements shall be determined by... 

Strontium carbonate Strontium nitrate Strontium oxalate Styphnic acid Styphnic acid Sub-VX... 

Coloring agent. Fire retardant. Stabilizer Strontium oxalate... 

Strontium oxalate (H2O) [814-95-9] M 193.6. Crystd from hot water (20ml/g) by cooling. 

Magnesium, barium nitrate and potassium nitrate Potassium perchlorate, barium nitrate and a binder Potassium perchlorate, strontium oxalate and a binder Potassium perchlorate, sodium oxalate and a binder Potassium perchlorate, copper carbonate and poly(vinyl White light Green light Red light Yellow light... 

Strontium oxalate, [CAS 814-95-9], SrC204, white precipitate (= 5.6 x 10-8) fonued by reaction of strontium salt solution and ammonium oxalate solution. 

White precipitate of strontium carbonate White precipitate of strontium sulfate White precipitate of strontium sulfate Yellow precipitate of strontium chromate White precipitate of strontium oxalate, which is soluble in mineral acids... 

Reliable Sample for Radiation Detection. The sample must be prepared for counting by an effective method. Many such methods have been published, each appropriate for its element. For example, strontium may be prepared for counting as strontium oxalate or carbonate, and iodine as silver or palladium iodide. Samples submitted for mass spectrometric analysis must be in a form that is suitably volatilized and processed by the instrument. 

Step 4. Remove from the oven, let cool, and weigh. Calculate the Sr2+ amount based on the amount of strontium oxalate weighed for each sample. Take the average of the replicate results. Label the bottle by indicating the concentration of the strontium as mg Sr2+ or strontium oxalate per mL, date, and initial. Note that the strontium oxalate includes waters of hydration. 

If 89Sr is present, the 89Sr and 90Sr +90Y beta-particle counts will have to be resolved. This is done by counting the strontium oxalate precipitate at least... 

Step 9. Add 5 mL of saturated (NH4)2C204 to the supernate, neutralize with ammonium hydroxide dropwise, and digest on a hot water bath for 5 to 10 minutes. A white precipitate of strontium oxalate forms. Centrifuge, and discard the supernate. Wash the precipitate by adding 2 mL of saturated (NH4)2C204 in 20 mL of water and stir. Centrifuge and discard the supernate... 

Ammonium oxalate solution white precipitate of strontium oxalate... 

This decreases the continuous spectrum due to the solid particles and makes the flame clear for the production of good colour. In such a case strontium oxalate may be more useful than strontium carbonate, but where magnesium is not used it seems that strontium carbonate is superior. 

Transuranic elements are extracted from seawater by coprecipitation with either ferric hydroxide or calcium/strontium oxalate or are leached from sediments with 8M nitric acid. Radiochemical separations are used to aruilyze PUy... 

The extraction of transuranic elements has been made by co-precipi-tation in several ways (5,6). We use either one of two methods, depending on what other nuclides are also sought in the sample. The first method is co-precipitation with 0.5-1.0 g iron as hydroxide at pH 9-10 using ammonium hydroxide while the second method is co-precipitation with calcium and strontium oxalate at pH 5-6 using oxalic acid. There are about 22 g calcium and 0.44 g strontium in 55 1. of open-ocean seawater. Because Sr is usually measured in the same seawater sample, we normally add 2 g strontium to that which is naturally present. 

Laboratory tests and a large-scale test in the fuel storage basin showed that strontium-90 can be removed from basin water by coprecipitating strontium with calcium oxalate. At a mole ratio of calcium plus magnesium-to-oxalate of 1.0, ca. 90% of the strontium will coprecipitate as strontium-calcium oxalate. However, the slow settling precipitate creates excessive turbidity in the water for many days, and slow hydrolysis of the strontium oxalate (ca. 10% per month) reduces the effectiveness of this treatment unless a method is available to remove the precipitate. 

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