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calcium pyrophosphate (7790-76-3) preparation: can be made of calcium hydrogen phosphate under certain conditions calcining and calcium pyrophosphate. in addition to industrial anhydrous calcium chloride solution after add bleach decoloring, iron removal filter, made a certain concentration of calcium chloride solution in the reactor, in the purification of mix slowly, anhydrous sodium pyrophosphate solution at 90 ℃ for reaction, generated anhydrous calcium pyrophosphate. after washing, dehydration, drying and calcination with calcium pyrophosphate. by the focal sodium acid react with anhydrous calcium chloride anhydrous. the industrial anhydrous sodium pyrophosphate dissolved in distilled water recrystallization, make it meet the requirements of food grade, and then dissolved preparation for later use. effect: usually it is not harm to water, without government permission, do not take material into the surrounding environment. if use and storage comply with the specifications will not break down. storage: avoid contact with magnesium, keep container seal into the receptacle tightly, store in a cool, dry place. identification test: 1. solubility: insoluble in water; soluble in dilute hydrochloric acid and dilute nitric acid. according to the ot - 42 method determination. 2. 1% sample of dilute hydrochloric acid liquid (ts - 117) of 1 ml solution, adding silver nitrate test solution (ts - 210) few drops. should generate soluble in dilute nitric acid solution (ts - 158) of white precipitate. 3. take a sample of about 100 mg, try with dilute hydrochloric acid liquid water 5 ml and 5 ml, tepid dissolved, try adding ammonia drops (ts - 13) 2.5 ml, accompanied by vibration wave, add 5 ml ammonium oxalate test solution (ts - 24). should generate a white precipitate. calcium pyrophosphate (7790-76-3) levels of analysis: accurate according to take a sample of about 200 mg, soluble in 10 ml dilute hydrochloric acid liquid (ts - 117). add 120 ml water, cooling 30 min, according to the need to add water dilute hydrochloric acid or during cooling, keep the volume of a solution and ph constant. after cooling plus 0.05 mol/ledta disodium 25 ml, diluted to 20.0 ml. with strong ammonia solution (ts - 14) neutral. add 10 ml buffer (ph 10; ts - 12) and chromium black drop test solution (ts - 97). zinc sulfate titration with 0.05 mol/l. each ml0.05 mol/ledta disodium is equivalent to 6.352 mg calcium pyrophosphate. quality indicator analysis: 1. the arsenic: dissolve 1 g sample to try 5 ml dilute hydrochloric acid liquid (ts - 117), with 30 ml water. according to the gt - 3 determination method. 2. lead: dissolve 250 mg samples from 5 ml diluted hydrochloric acid in the test solution, with 15 ml water, try to strengthen the ammonia liquid (ts - 14) to phenolphthalein test solution (ts - 167) in neutral. then press the gt - 18 method determination. 3. the heavy metal: take sample of 1.33 g, try with dilute hydrochloric acid liquid 7 ml, warm to dissolve, no longer diluted to 50 ml, filtering. take the filtrate 25 ml as sample liquid, then press the gt - 16 method determination.