Thermochromatography of Carrier-free Lead in Quartz Columns with Hydrogen and Argon as Carrier Gases

Abstract

Gasthermochrormtography/Carrier-free lead on quartz surfaces/ Argon and hydrogen carrier gases /Deduced adsorption enthalpies and entropies SummaiyThe thermochromatography of lead on quartz surfaces was studied over a broad ränge of the experimental Parameters gas flow rate and heating time. The carrier gases argon and hydrogen were used, Although in both cases elemental lead was applied to the Chromatographie system, from the experimentally determined deposition temperatures very different adsorption enthalpies A^^ of -498 and -222 kJ mol"' and adsorption entropies ASJ of -427 and -222 J mor' K"', respectively, were obtained for lead in the two carrier gases argon and hydrogen.

Vacuum-Thermochromatography of Carrier-free Species

“…(9) and (10) are not valid for these species. A similar Observation has already been made for carrier-free lead in quartz columns with argon as carrier gas [19].…”

Progress in ISOL target–ion source systems

“…Fig. 3 shows an overview of experimental adsorption enthalpies on quartz [18][19][20][21][22][23][24][25][26]. A certain scatter Those of molecules (e.g.…”

Microscopic interaction of single atomic elemental Hg with a sulfur surface

“…The low volatility of Pb -flerovium's lighter homologueprevents its use from gas-solid adsorption model experiments. In facts, its deposition temperature on quartz is at about 500°C, or higher [16], meaning that the chromatographic column with the sulfur surface should be kept at temperatures higher than sulfur's sublimation point, rendering thus the gas/solid study of the Pb/S interaction impossible. Additionally, the study of the reactivity of microscopic amounts of Hg towards a sulfur surface provides useful information about the possible application of elemental sulfur in the capture of gaseous mercury, which is for example produced in coal-fired power plants [17][18][19], or in the capture of radioactive isotopes of Hg escaping from accelerator driven spallation source installations [20] and from other nuclear facilities [21].…”