Research on ultrasonic extraction of ginkgolic acids in the testa of Ginkgo Biloba L.;

After the tobacco was simply treated by ultrasonic extraction using methanol/water(4∶1,V/V) and filtration,the obtained liquid sample was analyzed by HPLC(using) hypersil ODS column(4.

Ultrasonic extraction of hexachlorobenzene(HCB) from sediments was studied in this paper.

Determination of polycyclic aromatic hydrocarbons in tyre using supersonic extraction coupled with gas chromatography/mass spectrometry;

, traditional Soxhletextraction, microwave-assisted extraction and supersonic extraction.

Compared with conventional extraction(CE)using vibration,the time for supersonic extraction(SE)of first four speciation fractions for heavy metals was shorter than that taken for CE;and the extraction efficiency was104%～1120%higher than the CE.

A method for the determination of hydrocarbon in soils by combining different extractant solvents,hexane,petroleum ether and dichloromethane : hexane (1∶2,V/V) with spectrofluorimetry is described,and to get the validity of the method,Hydro-carbon pollutant in 93 soil samples of typical coal mine was determined quickly by ultrasonic wave extraction and fluorescence spec-trum.

The result of quantitative analysis of chlorophyll in the extract with spectrophometric method indicates that compared to the common method of maceration extraction using organic solvent ultrasonic wave extraction not only provides higher production and faster extraction but also has the advantage of needless heating.

The fluoride content in tea was determined by ultrasonic extraction and ion-selective electrode method.

For the ultrasonic extraction,they are as follows: petroleum ether as extraction solvent,mass ratio of raw material to extrac.

A method for the determination of free-formaldehyde in adhesives by ultrasonic extraction,2,4-dinitrophenylhydrazine derivatization,and gas chromatography coupled with electron capture detection(GC-ECD) has been developed.