Abstract
In the present work, an analytical method has been developed for the measurement of magnesium isotope ratios and the determination of magnesium concentration in 26Mg-spiked plant nutrient solutions by the reverse isotope dilution technique. The experimental parameters of the mass spectrometric measurements using quadrupole-based inductively coupled plasma mass spectrometry (ICP-MS) were optimized with respect to the lowest relative standard deviation (RSD) in the magnesium isotopic ratio ( 25Mg/ 24Mg and 26Mg/ 24Mg). The RSD of the measured isotopic ratios was determined in different concentrations of isotopic standard solution (NIST SRM 980T 26Mg-enriched isotopic standard) of natural isotopic abundances (from 1 to 50 μg/L with 1.9% to 0.22% RSD, respectively). Long-term isotopic ratio measurements using 50 μg/L isotopic standard solution (NIST SRM 980) yielded 0.14% RSD for 25Mg/ 24Mg and 0.23% RSD for 26Mg/ 24Mg. The accuracy of measured isotopic ratios was 0.1% to 0.3% [ 25Mg/ 24Mg 0.12684 ± 0.00018 (measured) versus 0.12663 ± 0.00013 (certified) and 26Mg/ 24Mg 0.13958 ± 0.00036 (measured) versus 0.13932 ± 0.00026 (certified)]. Synthetic isotopic mixtures of NIST SRM 980 and highly enriched 26Mg solutions were prepared and the measured isotopic ratios were compared with the calculated ones. The RSD of the isotope ratios measurements ranged between 0.14% to 0.07% for the 25Mg/ 24Mg ratio and 0.2-0.04% for the 26Mg/ 24Mg ratio. The developed method has been successfully applied for the determination of the magnesium isotope ratios and the concentration measurements in 26Mg-enriched plant nutrient solution samples with reverse isotope dilution technique. The nutrient solutions investigated contained high amounts of calcium and potassium (20–35 μg/ml and 9.7–30 μg/ml, respectively). Magnesium concentrations were determined by inductively coupled plasma optical emission spectrometry (ICP-OES) and ICP-MS with external calibration and the measured values are in agreement with the results obtained by the reverse isotope dilution technique.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
