M. Járó - L. Költő szerk.: Archaeometrical research in Hungary (Budapest, 1988)
Analysis - GEGUS Ernő: Investigation of archaeological bronze and silver findings by using various emission spectroscopic methods
Knowledge of the effective chemical composition of bronze and silver archaeological llndings is, however, an important aid for archaeologists or museums. Therefore, both of the above methods were used in complex investigations. For this reason, selected samples -e.g. broken pieces of findings - were partly dissolved and analysed by the "quasi absolute" spectrochemical solution method, and partly used as solid standard samples for the "quasi-nondestructive"laser-micro-spectral analysis method. 2. Experimental Preparation of solutions — bronze samples were dissolved in a Br 2 —HBr solution mixture, each 100 mg sample in OimL Br 2 aqueous solution (35%) + 15 mL HBr (48%) - silver samples in HN0 3 , each 100 mg in 2 mL HN0 3 (1 + 4). Introduction of solutions (0.15 mL/Min) into the source using a pneumatic nebulizer (Erdey-Gegus-Kocsis system) with argon spraying gas. Source: higli-voltage spark [1]. U = 12 kV, C = 12 nF, L=l-5 mH, or stabilized d. c. arc of Marinkovic and Zmb ova [11]. Recording of spectra: plane-grating spectrograph (Zeiss, Jena), UV range, rec. lin. disp. 0.76 nm/mm, emulsion Agfa-Gevaert Scientia 34B50. Laser-micro-spectral analysis Source: LMA 1 (Zeiss, Jena); ruby resonator with Q-switch, and cross-spark exitation. Recording of spectra: plane-grating spectrograph (Zeiss, Jena), UV range, rec. lin. disp. 0.76 nm/mm, quarte-cylindrical lense for increasing luminous intensity; emulsion Agfa-Gevaert Scientia 34B50. 3. Results Analysis of solution samples Analysis line pair, nm Concentration range, % Bronze samples. Pb 283.31 - Cu 296.12 0.5 25 Zn 307.59 -Cu 306.34 0.5 25 Sn 284.00 - Cu 296.12 0.5 20 Bi 306.77 - Cu 30634 .0.01 0.5 Sb 259.81 - Cu 296.12 0.1 5 Ag 328.07 - Cu 306.34 0.0030.03 Ni 305.08- Cu 306.34 0.1 5 Silver samples: Cu 296.12 - Ag 272.18 0.5 40 Pb 26632 - Ag 272.18 0.5 18 Bi 289.80 - Ag 272.18 0.03 0.8
