8.3. Sodium Tartrate Test
The sodium tartrate test verifies the heater and force balance operation. Sodium tartrate dihydrate is a chemical with a known moisture concentration that releases moisture at temperatures greater than 120º C.
Because of its consistent moisture concentration, it is used as a standard in moisture measurement using oven or titration methods. To obtain consistently reliable results, use a high quality or reagent grade (ACS certified) granular sodium tartrate. Sift the sodium tartrate through a #20 sieve to obtain a more uniform size that will achieve better results. Lumps in sodium tartrate usually indicate moisture absorption that will yield inconsistent results. Discard the larger chunks, or pestle them through the sieve and return them to the bottle.
Sodium tartrate is available from AZI as P/N
The sodium tartrate test uses approximately 8 grams of sample and is run at 150º C. Results should be within a range of ±0.1 of the assayed value on the label of the chemical. Sodium tartrate assayed moistures typically range from 15.61 - 15.71.
∙Open the lid; place a clean, dry, empty pan the pan support
∙Close the lid
∙From main test screen, press [MEMORY]
∙Highlight "(Factory) Tartrate" and press [START], then
press [ABORT] (This will set the instrument idle temperature to 80 degrees.)
∙Allow the instrument to reach 80°C (Approx.
∙When the instrument has reach 80°C, press [START]
∙Allow instrument to tare empty pan
∙When instructed, open the lid
∙Add sample; use a spoon to evenly spread 7.9 to 8.1 grams of Tartrate on the surface of the pan (8 grams is best)
∙Close the lid and allow instrument to start the test
∙Allow the test to complete
∙If this is the first test of the day, discard the results of this test for stability reasons.
∙Results should be within a range of ±0.1 of the assayed value on the bottle label.
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