Spatial determination of elements in green leaves of oak trees (Quercus robur) by laser ablation-ICP-MS |
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| Authors: | E. Hoffmann C. Lüdke J. Skole H. Stephanowitz E. Ullrich D. Colditz |
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| Affiliation: | Institut für Spektrochemie und angewandte Spektroskopie, Albert-Einstein-Str. 9, 12489 Berlin, Germany e-mail: Hoffmann@isas-berlin.de, DE
Gesellschaft zur F?rderung angewandter Optik, Optoelektronik, Quantenelektronik und Spektroskopie e. V., Rudower Chaussee 29, 12489 Berlin, Germany, DE
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| Abstract: | Laser ablation inductively coupled plasma mass spectrometry (laser ablation-ICP-MS) has been applied to the spatially resolved determination of the elements Mg, Ca, Cu, Ni, Ba, Al, Pb, Sr and Mn in green leaves of oak trees. Instrument operating parameters such as the laser wavelength and the pulse energy have been optimized to provide the sensitivity and reproducibility required for the analysis. The method provides spatial resolution down to 300 μm with the use of the 355 nm wavelength (3rd harmonic of the 1064 nm Nd:YAG laser wavelength) and the pulse energy of 50 mJ. Plant standards and cellulose, doped with multi element solution standards, dried and pressed to pellets were used as calibration samples. To compensate for signal fluctuations caused by the variation of the ablated sample mass 13C was used as a “natural” internal standard. The accuracy of the calibration was verified with selected samples analyzed by ICP-MS (high pressure digestion, 170?°C, 107 Pa, HNO3, 2 h) and by laser ablation-ICP-MS. Recovery rates between 93% (Cu) and 108% (Mn) were obtained. Leaves taken from oak trees (Quercus robur) were analyzed. |
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