In the environmental monitoring at gas stations, total petroleum hydrocarbons (TPH) and aromatic hydrocarbons, such as benzene, toluene, ethylbenzene, and xylenes (BTEX), are determined to verify soil contamination. However, ...

A sample preparation method based on ultrasound assisted-extraction (UAE) of Ca, Mg and P from swine feed has been described. The experiment was performed to cover the variables influencing the sonication process and, the ...

In this paper, multivariate optimization was applied for the development of an ultrasound-assisted multielemental extraction procedure for analysis of bean samples by inductively coupled plasma optical emission spectrometry. ...