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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

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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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