Neutron activation analysis of absolutely-dated tree rings

Ünlü, Kenan; Kuniholm, Peter Ian; Chiment, John; Hauck, Danielle K

doi:10.1007/s10967-005-0669-x

Cited by 14 publications

(4 citation statements)

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“…Vertical lines mark years of probable volcanic activity (ice core acidity, ring width minima, frost rings compiled from Salzer and Hughes [2007]). Au uptake has been linked with the impact of volcanogenic sulphate [ Ünlü et al , 2005]; however, no response or replication could be found in this study. The degree of variability shown by this element is typical of that for other elements between trees.…”

Section: Resultscontrasting

confidence: 60%

“…The majority of studies have focused on reconstructing the timing and impacts of various types of anthropogenic pollution on the natural environment, but an alternative application is the detection of elemental indicators of volcanic eruptions in dated tree ring sequences [ Pearson et al , 2005; Ünlü et al , 2005; Pearson et al , 2006; Pearson , 2006]. Eruptions of known date have been linked with changes in elemental chemistry in Pinus sp.…”

Section: Introductionmentioning

confidence: 99%

“…Extremely narrow tree rings (sometimes less than 40 μ m) coupled with the exceptional nature of Pinus longaeva samples means that analysis via established dendrochemical techniques such as ICPMS [ Hall et al , 1990; Watmough and Hutchinson , 1999; Padilla and Anderson , 2002], NAA [ Oliveira et al , 1997; Wallner , 1998; Ünlü et al , 2005] or AAS [ Ferretti et al , 1993; Jonsson et al , 1997; Penninckx et al , 1999], would be problematic, if not impossible. Such techniques would destroy whole samples and for annual resolution require dissection of individual rings, something which would be largely unfeasible given the ring size.…”

Section: Introductionmentioning

confidence: 99%

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Dendrochemistry of White Mountain bristlecone pines: An investigation via Synchrotron Radiation Scanning X‐Ray Fluorescence Microscopy

et al. 2009

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Synchrotron Radiation Scanning X‐Ray Fluorescence Microscopy (SXFM) was used for the first spatially/temporally resolved investigation of the multielemental chemistry of bristlecone pine (Pinus longaeva D.K. Bailey). A new protocol was designed to apply this nondestructive method of analysis to this unique palaeoclimatological resource, extracting previously inaccessible dendrochemical information at subannual resolution from tree rings ranging from 1400 to 40 μm. The potential of Pinus longaeva was assessed for the reconstruction of multicentennial annual resolution sequences of elemental change, with specific focus on the identification of multielemental markers for major, climatically effective volcanic eruptions. Increases in calcium (Ca), strontium (Sr), manganese (Mn), and zinc (Zn) were identified in association with frost rings around AD1601, following the eruption of Huaynaputina, Peru, but these could not be directly attributed to volcanogenic changes in environmental chemistry. Elemental patterns for 500 years from five trees demonstrated little agreement indicating that, for the elements detected, this species may be unsuitable for temporal reconstructions of external chemistry. Further development of SXFM dendrochemical technique, however, offers much potential for future work.

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Section: Resultscontrasting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dendrochemistry of White Mountain bristlecone pines: An investigation via Synchrotron Radiation Scanning X‐Ray Fluorescence Microscopy

et al. 2009

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“…Dendrochemistry, the measurement and interpretation of elemental concentrations in tree rings (Smith and Shortle 1996), has been applied in a wide array of environmental research, including to hemisphericand global-scale explosive eruptions (Hall et al 1990;Padilla and Anderson 2002;Ü nlü et al 2005;Pearson 2006;Pearson et al 2005Pearson et al , 2006. However, we know of no dendrochemistry research on cinder-cone eruptions.…”

Section: Introductionmentioning

confidence: 99%

Multiple Dendrochronological Signals Indicate the Eruption of ParíCutin Volcano, Michoacán, Mexico

et al. 2008

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The eruption of Parícutin (1943Parícutin ( -1952, a cinder cone volcano in Michoacá n, Mexico, caused dendrochronological and dendrochemical responses that might be useful as general dating tools for eruptions. For the eruption period, pines near Parícutin have slightly suppressed ring widths plus high inter-annual variability of width. Wood anatomy changes include traumatic resin ducts and thin bands of false latewood. Dendrochemistry of tree rings shows little temporal variation in most elements, but beginning in 1943 sulfur content increased in rings of four trees and phosphorus content increased in rings of two trees. Hypotheses for increased S and P include new availability of pre-existing soil S and P and/or new input of S and P from the tephra itself. Pines at Parícutin also show suppressed ring widths for five years beginning in 1970, and had the eruption date not been known, the most likely conclusion from ring-width data alone would have been an eruption from 1970 to 1974. However, the 1970s suppression was in response to defoliation by a pine sawfly outbreak, not an eruption. For dendrochronological dating of cinder-cone eruptions, a combination of multiple characteristics (width, chemistry, and anatomy) would be more reliable than depending on any one characteristic alone.

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Noble Metals, Analytical Chemistry of

Balcerzak

2015

Encyclopedia of Analytical Chemistry

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Attractive physical, chemical, and biological properties of the noble (precious) metals – ruthenium, rhodium, palladium, osmium, iridium and platinum (so‐called platinum group metals (PGMs)) and gold – result in their wide applications. The main demands for the metals are from autocatalysts; chemical, electrical, and electronic industries; and jewelry and investment. Medical applications of some noble metal compounds, in particular those exhibiting anticancer activity, are of great importance. A large variety and complexity of the examined (geological, environmental, industrial, and biological) materials, great chemical similarities and low stability of the noble metal species in solutions, and wide concentration ranges (from sub‐ppb to >99.99%) to be determined make the accurate determination of the metals a difficult analytical problem. Identification and quantification, both of elemental and molecular forms of the metals, in the examined samples require methods capable of separation of the analytes from the interfering matrix components and their detection. The choice of a suitable sample preparation procedure and its successful coupling with the detection technique of required selectivity and sensitivity are fundamental factors limiting the quality of the results. Analytical methods applicable in the analysis of the noble metal samples are presented in this chapter.

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Neutron activation analysis of absolutely-dated tree rings

Cited by 14 publications

References 1 publication

Dendrochemistry of White Mountain bristlecone pines: An investigation via Synchrotron Radiation Scanning X‐Ray Fluorescence Microscopy

Dendrochemistry of White Mountain bristlecone pines: An investigation via Synchrotron Radiation Scanning X‐Ray Fluorescence Microscopy

Multiple Dendrochronological Signals Indicate the Eruption of ParíCutin Volcano, Michoacán, Mexico

Noble Metals, Analytical Chemistry of

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