期刊
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
卷 411, 期 3, 页码 565-580出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-018-1489-5
关键词
Diagenesis; LASS ICP-QMS; MC ICP-MS; Near-infrared hyperspectral imaging; Human bone remains
资金
- COMET-K1 competence center FFoQSI
- Austrian ministry BMVIT
- Austrian ministry BMDW
- Austrian province Niederoesterreich
- Austrian province Upper Austria
- Austrian province Vienna
- ERASMUS+ program
This paper presents a combination of elemental and isotopic spatial distribution imaging with near-infrared hyperspectral imaging (NIR-HSI) to evaluate the diagenetic status of skeletal remains. The aim is to assess how areas with biogenic n(Sr-87)/n(Sr-86) isotope-amount ratios may be identified in bone material, an important recorder complementary to teeth. Elemental (C, P, Ca, Sr) and isotopic (n(Sr-87)/n(Sr-86)) imaging were accomplished via laser ablation (LA) coupled in a split stream to a quadrupole inductively coupled plasma mass spectrometer (ICP-QMS) and a multicollector inductively coupled plasma mass spectrometer (MC ICP-MS) (abbreviation for the combined method LASS ICP-QMS/MC ICP-MS). Biogenic areas on the bone cross section, which remained unaltered by diagenetic processes, were localized using chemical indicators (I(C)/I(Ca) and I(C)x10/I(P) intensity ratios) and NIR-HSI at a wavelength of 1410nm to identify preserved collagen. The n(Sr-87)/n(Sr-86) isotope signature analyzed in these areas was in agreement with the biogenic bulk signal revealed by solubility profiling used as an independent method for validation. Elevated C intensities in the outer rim of the bone, caused by either precipitated secondary minerals or adsorbed humic materials, could be identified as indication for diagenetic alteration. These areas also show a different n(Sr-87)/n(Sr-86) isotopic composition. Therefore, the combination of NIR-HSI and LASS ICP-QMS/MC ICP-MS allows for the determination of preserved biogenic n(Sr-87)/n(Sr-86) isotope-amount ratios, if the original biogenic material has not been entirely replaced by diagenetic material.
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