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The extraction time must be adjusted to obtain quantitative recoveries. Thus,extraction efficiency increases with the sonication time until equilibrium is reached.Extraction times of between 3 and 60 min are described in the literature. Longer extraction times could produce a significant reduction of the recoveries obtained,probably due to degradation of the compounds  or decomposition of the organic solvent caused by the effects of the ultrasound waves

[ Last edited by musashino on 2010-7-28 at 09:59 ]
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The extraction time must be adjusted to obtain quantitative recoveries.³¬ÉùÌáȡʱ±ØÐëµ÷ºÃÌáȡʱ¼äÒÔ»ñµÃ¶¨Á¿µÄÌáÈ¡ÂÊ.
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Thus,extraction efficiency increases with the sonication time until equilibrium is reached.ÕâÊÇÒòΪ£¬ÔÚÌáÈ¡Îïµ½Èܽ⵽´ïƽºâǰ£¬ÌáÈ¡µÄЧÂÊËæ×ų¬ÉùÌáÈ¡µÄʱ¼ä¶øÔö´ó¡£
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3Â¥2010-07-28 13:06:59
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Extraction times of between 3 and 60 min are described in the literature.ÎÄÏ×ÔØÂ¼Öг¬Éù²¨ÌáÈ¡µÄʱ¼äΪ3µ½60·ÖÖÓ¡£
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Longer extraction times could produce a significant reduction of the recoveries obtained¹ý³¤µÄÌáȡʱ¼ä¿ÉÄÜ»áÃ÷ÏÔ½µµÍÓ¦ÓеÄÌáÈ¡ÂÊ¡£
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,probably due to degradation of the compounds  or decomposition of the organic solvent caused by the effects of the ultrasound waves
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musashino

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Originally posted by ¹Å¿É¤× at 2010-07-28 13:28:24:
,probably due to degradation of the compounds  or decomposition of the organic solvent caused by the effects of the ultrasound waves
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7Â¥2010-07-29 09:02:18
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musashino(½ð±Ò+2, ·­ÒëEPI+1): 2010-07-29 14:56:33
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