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5Â¥2016-07-12 15:25:03
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borowsky
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borowsky
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borowsky
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xin1990yi
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(c) Preparation of sample. Cut the sample into small pieces of less than 2¡Á2 cm and homogenise. Weigh (to the nearest 0.1 mg) 0.3g (w mg) of the sample into a reflux flask (100ml). Add xylene (18 ml) and by pipette internal standard solution (2.0 ml). Attach the flask to the refiux condenser and reflux the sample for about 30 min while stirring. Cool the sample to room temperature and reflux the sample for about 30 min while stirring. Cool the sample to room temperature and filtered solution and evaporate the solvent using a stream of nitrogen .Dissolve the residue quantitatively in 0.5 ml of mobile phase.·½·¨ÉÏûдÓõªÆø´µÊ±Ðè²»ÐèÒª¼ÓÈÈ£¬ÈܼÁÊǶþ¼×±½£¬·Ðµã140¶È£¬ÇëÎÊÓõªÆø´µµÄʱºòÐè²»ÐèÒª¼ÓÈÈ£¿ |
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