[Expert Council Resolution. Practical Aspects of the Diagnosis and Correction of Potassium and Magnesium Deficiency States].

The article analyzes properties of potassium and magnesium, which may exert vasodilatory, anti-inflammatory, anti-ischemic, antiaggregant, and antiarrhythmic effects. These are extremely important microelements and potentially beneficial therapeutic agents for treatment of cardiovascular diseases.

The effect of solution level on calorific and dosimetric results in a 70 kHz tower type sonochemical reactor.

In order to design and optimise sonochemical reactors it is important to study the impact of liquid level, or path length, on the standing wave phenomena and the influence this has on temperature increase and OH radical rate of production. In this work, an ultrasonic tower type reactor operating at 70 kHz is investigated with results from variations to liquid levels reported. Calorimetry data was obtained using a modified reactor set up with temperature change monitored at selected points within the chamber. OH radical rate of formation was shown via chemical dosimetry, following the conversion of terephthalic acid (TA) to 2-hydroxyterephthalic acid (HTA). The results obtained have shown that changes in solution depth of a few millimetres significantly impacts on the interaction of the propagated and reflected waveforms with the results of calorific measurements and HTA rates of formation varying by 90% (750 J) and 88% (80 mmol dm(-3) min(-1)) between the operational extremes over the studied depth range.

The sono-degradation of phenanthrene in an aqueous environment.

Polynuclear aromatic hydrocarbon (PAH) contamination has spread throughout the globe with background levels now found in virtually all sections of the ecosystem and environment. The mutagenic and/or carcinogenic properties attributed to many of these compounds, and frequency of occurrence and concentration in the environment, has driven research into safe methods of removing contamination, whilst avoiding the use of harmful solvents or the formation of even more hazardous compounds. Ultrasound is currently used in industry and research to propagate and accelerate chemical reactions, opening reaction pathways which otherwise would not be observed. In the study of the degradation of PAHs through ultrasonic irradiation, the breakdown of an aqueous solution of phenanthrene in a sonochemical reactor utilising a 30 kHz probe system, operating in batch mode, has been investigated. The phenanthrene molecule was studied and used as a model PAH molecule. It was chosen due to the structural similarities to many of the higher order PAHs currently recognised as being hazardous to health. The influence of several parameters on the degradation of phenanthrene are reported (power ultrasound energy, temperature and light). Qualitative analysis using HPLC and quantitative analysis using UV/Vis photo-spectrometry confirmed that a 88% reduction in the peak observed phenanthrene concentration was achieved over 240 min of sonocation. Whilst there was the potential for the formation of recalcitration and rearrangement products, no higher order PAHs were observed and a 80% reduction in total monitored UV fluorescence and hence, aromaticity/conjugation, was observed.