Double frequency ultrasound at oils and fats sample preparation for detection of lead and cadmium
Abstract
Application of double frequency ultrasound at oils and fats sample preparation for detection of lead and cadmium was examined. The irradiation with a combination of 1.0-2.5 W/cm2 20-45 kHz and 0.5-0.75 W/cm2 1.0‑2.5 MHz ultrasound during 2-3 minutes intensifies acid mineralization of samples and allows to enhance the extraction of lead and cadmium, to increase the ratio of organic to water phases and to improve reproducibility of analysis compared to its single-frequency versions.
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