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2Â¥2012-10-08 15:03:04
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Õâ¸öÒ²Ðí¿ÉÒÔÔÚÓ«¹âÏ¿´°µ°ßµã¡£ ÒÔÏÂËä˵¿ÉÒÔÏÔÁ×Ëáõ¥£¬µ«ÊÇÁ×îâËáÊÇÒ»¸öͨÓÃÏÔÉ«¼Á£¬²»ËãרÊô¡£ Ammonium molydbate For detection of phosphoric acid derivatives Solution I: 1M perchloric acid in water/acetone (1:1) Solution II: ammonium molybdate soln: 5g (NH4)6Mo7O24.4 H2O in 35ml semi-conc. Nitric acid and 65ml water. Solution III: Tin(II) chloride soln: 0.5g SnCl2.2 H2O in 100ml 0.5M hydrochloric acid: Dry developed chromatogram and heat to 60 C Hydrolyse di- and triphosphates by spraying perchloric acid (solution I) onto the warm plate. After spraying 2 times, dry plate slowly at 50 C. Amidophosphates might not be decomposed. In any case, spray the still warm plate with ammonium molybdate solution (solution II) Then spray the still wet plate with tin (II) chloride solution (solution III) Results: Phosphates appear as blue to blue-green spots. Polyphosphates can also be detected by dipping the plates in a solution of ammonium molybdate (1g) dissolved in water (8ml) and perchloric acid (3ml, ca. 70%),filled up to 100ml with acetone. Then phosphates appear as yellow-green spots on a blue background. Also see Molybdenum blue reaction according to Dittmer and Lester. |

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