- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Determination of Metal Concentration in Road-Side Trees from an Industrial Area Using Laser Ablation Inductively Coupled Plasma Mass Spectrometry
摘要： Historical pollution can be elucidated with variations of elements’ concentration in tree rings by using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). However, the capacity of chemical elements’ absorption significantly depends on the tree species and element types. Metal concentrations in the rings for five species (Platanus occidentalis, Salix koreensis, Chamaecyparis obtusa, Pinus densiflora, Ginkgo biloba) were investigated in light of metal pollution history in ambient air of D industrial site located in Daejeon, Korea. The calibration for LA-ICP-MS was performed using cellulose-matrix matched standards with 13C normalization. Tree ring series except for Ginkgo sp. showed that the accumulation rates of Pb and Cd were higher between 1992 and 1999. Other elements, such as Fe, Cr, Mn, Cd, Zn, and Sr, showed a variation in the rings, likely due to the different physiological processes of element uptake and radial mobility. Concentrations of Pb and Cd in the annual rings of Pinus sp. corresponded to the metal monitoring data for the ambient air with the correlation coefficients of 0.879 and 0.579, respectively. Moreover, Cd in Platanus sp. and Pb in Salix sp. showed a positive correlation to ambient metal concentration compared to Chamaecyparis sp. and Ginkgo sp. Therefore, caution should be taken to select candidate elements as well as tree species to reconstruct the ambient air metal pollution history by measuring the concentration of metal in the tree ring.
关键词： Environmental pollution history,Tree ring,Dendrochemistry,LA-ICP-MS
更新于2025-09-23 15:19:57
-
Laser-induced breakdown spectroscopy characterization of tree rings from the Popocatépetl volcano area, Mexico
摘要： Laser-induced breakdown spectroscopy (LIBS) was used to monitor macro- and micro-nutrients in pine trees exposed to two mayor activity periods of the Popocatépetl volcano in Mexico. Due to the high spatial resolution achieved with LIBS, a separate analysis of earlywood and latewood was performed. An increased concentration of potassium was found in earlywood, while calcium and sodium decreased. Besides, it was observed a similar temporal behavior for elements belonging to the same chemical group. The alkali earth metals Ca, Mg and Sr showed decreasing trends through the investigated years while alkali metals Na and K remain nearly constant. LIBS was able to detect signi?cant changes in Ca, Mg, Na and Sr intensities coincident with the 1919 Popocatépetl's eruptive period and after the volcanic activity starting at the end of 1999. Temporal evolution of the emission intensities is in agreement with the elemental composition obtained with inductively coupled plasma optical emission spectrometry.
关键词： Dendrochemistry,Laser-induced breakdown spectroscopy,Tree rings,Popocatépetl volcano
更新于2025-09-11 14:15:04