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| Extraction of TAS from finely ground sample was carried out by ultrasonic-assisted extraction in small columns. Polyethylene frits were placed at the end of each glass column next to a filter paper circle. Subsequently, 3 g of sample and 20 ml of absolute ethanol were added and the columns were immersed into the ultrasonic water bath at 80 ¡ãC. ÖÐPolyethylene frits ÊÇʲôÒâ˼£¬ËûÔÚ³¬Éù²¨ÖÐÆðʲô×÷ÓÃÄØ£¬ÓÐÄǸöÅóÓѰïæ½âÊÍÒÔÏ¡£ |
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- ×¢²á: 2005-06-06
- רҵ: ÉúÎï²ÄÁÏ
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