EXPRESS DETERMINATION OF TOXIC MICROELEMENTS IN BRINE AND MINERAL WATERS 3 USING HIGH FREQUENCY ULTRASOUND DURING HOMOGENIZATION OF EXTRACTS
DOI:
https://doi.org/10.15421/jchemtech.v34i2.352304Keywords:
atomic absorption analysis, lead, copper, cadmium, ultrasound, extraction, homogenization intensification, butyl acetate, acetone, tap water, brines, metrological characteristicsAbstract
The possibility of using homogenization of chloroform extracts of diethyldithiocarbamates of lead, copper, and cadmium with a mixture of butyl acetate and acetone has been demonstrated. The optimal ratio of extract to homogenizing mixture was experimentally determined to be 1.0 : 1.0. In this case, the homogenizing mixture should consist of butyl acetate and acetone in a ratio of (1 : 0.2–1 : 0.5). The optimal parameters for ultrasound homogenization were defined as follows: frequency 12.0–14.0 MHz, intensity 3.0–4.0 W/cm2, and exposure time 3–4 minutes. A method for atomic absorption determination of lead, copper, and cadmium content in brines and waters was developed. The accuracy of the method was verified by analyzing the same samples using re-extraction (standard method) as well as the "added-found" method. The developed method provides the determination of lead in brines and waters with a Sr range from 0.076 to 0.084, copper with a Sr range from 0.072 to 0.078, and cadmium with a Sr range from 0.081 to 0.089. The method was successfully tested on tap water and brines. The use of ultrasonic homogenization of extracts combined with atomic absorption determination allows for rapid control of lead, copper, and cadmium content in waters and brines at levels equal to or below the maximum allowable maximum permissible concentration.
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