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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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Extraction times of between 3 and 60 min are described in the literature.ÎÄÏ×ÔØÂ¼Öг¬Éù²¨ÌáÈ¡µÄʱ¼äΪ3µ½60·ÖÖÓ¡£
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