Potassium is an essential major nutrient for plant growth and development. Plants absorb more K (potassium) than any other element, with the exception of N. Most plant-available forms of essential plant nutrients are ionic. Among the many plant mineral nutrients, K stands out as a cation having the strongest influence on quality attributes. Potassium ions are involved in many processes that result from ionic activity in the hydroponic nutrient solution and often provide positive contributions. Due to the presence of potassium cation ions, some elements increase in nutrient solution, whereas others decrease.
Gamma-irradiated sulfanilic acid (C6H7NO3S) single crystals were analyzed by electron paramagnetic resonance spectroscopy at 120 K temperature. The irradiation was carried out at room temperature using a 60 Co-gamma source. EPR spectra of gamma-irradiated sulfanilic acid single crystals were obtained by rotating the magnetic field for three different orientations of the crystal. The paramagnetic center formed in the gammairradiated sulfanilic acid single crystal was determined by examining of the EPR spectra. The EPR spectra of this compound have been found to be temperature independent. The principal values of the hyperfine structure constants of the unpaired electron, and the principal values of the g-tensor and direction cosines of the radiation damage centers are calculated. The values were compared with those in the literature, and the results were found to be consistent.
Magnetic resonance is divided into electron spin resonance (ESR) [electron paramagnetic resonance (EPR)] and nuclear magnetic resonance (NMR) according to the working region in the electromagnetic spectrum. If the studied region is in the microwave region, this resonance type is electron spin resonance. If the region studied is the radio frequency region, then nuclear magnetic resonance is mentioned. ESR and NMR are similar in terms of their basic theorem.
Abstract:A new and simple differential pulse polarographic procedure was established for the trace determination of mercury(II). An indirect method had to be used since no polarographic peak can be observed for its direct determination.According to their standard potentials, the reaction between SO
2− 3and Hg(II) was suitable. The peak height of sulfite at about -0.70 V (pH 6, 7) was sharp, high, and very reproducible, enabling the accurate determination of low concentrations of Hg(II). It was found that sulfite concentration had to be 3 times larger than mercury at pH 6, in order to have a quantitative reaction.The procedure is simple: to a known amount of sulfite in the polarographic cell (HAc, pH 6 or 7) is added an unknown Hg(II) sample. The Hg(II) concentration is calculated simply from the decrease in the sulfite peak after reaction with Hg(II). The limit of detection was 1 × 10 −6 M (S/N = 3) in this medium, which could not be obtained with most other mercury determination methods. The proposed new method exhibits high selectivity, sensitivity, reproducibility, and accuracy. It was successfully applied to synthetic samples and to a raw salt sample taken from a salt lake (closed basin) in Turkey. No considerable interference was observed from most common ions.
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