Laser ablation-ICP-MS depth profiling to study ancient glass surface degradation
| Autor: | Ligia Maria Moretto, Johannes T. van Elteren, Emilio Francesco Orsega, Serena Panighello |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
depth profiling
Materials science Bulk composition internal standardization Analytical chemistry Mineralogy Mass spectrometry lastnosti Biochemistry Microanalysis Analytical Chemistry law.invention Corrosion microanalysis udc:620.1/.2 law bulk composition Settore CHIM/01 - Chimica Analitica education Inductively coupled plasma mass spectrometry education.field_of_study Laser ablation glass density Glass density Volumetric Mass Density Laser Depth profiling Internal standardization materiali steklo mikroanalize laser ablation Laser drilling |
| Zdroj: | Analytical and Bioanalytical Chemistry, vol. 407, no. 12, pp. 3377-3391. |
| ISSN: | 1618-2650 1618-2642 |
| Popis: | In general the analysis of archeological glass represents a challenge for a wide variety of objects because of the presence of physical and/or chemical damage on the surface of the artifact, also known as weathering or corrosion. To retrieve accurate bulk elemental information by laser ablation-inductively coupled plasma-mass spectrometry (ICP-MS), the original, pristine glass needs to be "reached", thereby penetrating the alteration layer which is often more than 10 μm thick. To study this alteration layer the laser was operated in the drilling mode, either with a low (1 Hz) or a high (10 Hz) pulse repetition rate for a period of 50 s yielding detailed spatial information for ca. 20 elements over a shallow depth (ca. 5 μm) or less-detailed spatial information for 50-60 elements over a greater depth (ca. 50 μm). Quantitative elemental depth profiles (in wt%) were obtained with the so-called sum normalization calibration protocol, based on summation of the elements as their oxides to 100 wt%. We were able to associate the increase of SiO2 (in wt%) in the alteration layer to the volumetric mass density change in the glass as a result of depletion of Na2O and K2O. Also the interaction of the number of laser shots with the alteration layer is shown experimentally via depth measurements using profilometry. Chemical and physical changes in four ancient glass artifacts, directly and indirectly measureable by laser drilling, were studied as a function of internal and external factors such as age, composition, and exposure conditions. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|