Researchers Present New Method for Minimizing Chloride Interferences during Soil Analysis
Christophe Waterlot and Francis Douay have successfully developed a new analytical method for measuring cadmium in calcium chloride extracting solution by Graphite Furnace Atomic Absorption Spectrometry (GFAAS) via the high-speed self-reversal background correction (HSSR-BGC) system. Hettich’s ROTANTA 460 high-capacity benchtop centrifuge was employed for the research.
During the research, triplicate soil subsamples and six sample reference material replicates were weighed in a polyethylene tube. 30mL of 0.01 M CaCl2 was added and the suspension was shaken with a rotor disc for 2 hours at 10 rpm. The extract was then separated from the solid residue by centrifugation at 4530 rpm with the ROTANTA 460 centrifuge.
The effects of calcium chloride on the cadmium absorbance were observed and compared to the minimized interference results using the deuterium background correction (D2-BGC) system, wherein a deuterium lamp was used as a continuum light source in combination with a chemical modifier. The accuracy of the newly developed method was also verified using four reference materials. Results from an analysis of soils contaminated with various metals collected in Northern France showed that the proposed method was able to successfully determine calcium chloride extractable cadmium within the samples.
The ROTANTA 460 benchtop centrifuge features a maximum capacity of 3 liters per run and is perfect for use within clinical and research & development laboratories. Hettich provides a wide range of laboratory centrifuges such as the ROTANTA 460 for reliable clinical testing and research applications. To learn more about Hettich’s state-of-the-art centrifuges, visit www.hettweb.com/view-all-centrifuges.html.