An Environmentally Friendly Method for As, Cd, Cr, Cu, Ni, and Pb Determination in Terrestrial Moss Samples Using Ultrasonic Slurry Sampling Combined with Electrothermal Atomic Absorption Spectrometry

摘要

Novel ultrasonic slurry sampling methods combined with the ETAAS determination of As, Cd, Cr, Cu, Ni, and Pb in terrestrial moss samples were developed without using corrosive acids. A pulverized moss sample between 1 to 50 mg (depending on element concentration) was placed into a 2.5 mL autosampler cup with 2 mL of HNO3 (0.2 M), containing 0.01% of Triton X-100 reagent. The sample was then sonicated directly into the autosampler cup, using an ultrasonic probe at 85% power setting of 7 W for 25 seconds before injection.