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Future giant liquid argon (LAr) time projection chambers (TPCs) require apurity of better than 0.1 parts per billion (ppb) to allow the ionisedelectrons to drift without significant capture by any electronegativeimpurities. We present a comprehensive study of the effects of electronegativeimpurity on gaseous and liquid argon scintillation light, an analysis of theefficacy of various purification chemicals, as well as the Liverpool LAr setup,which utilises a novel re-circulation purification system. Of the impuritiestested - Air, O_2, H_2O, N_2 and CO_2 in the range of between 0.01 ppm to 1000ppm - H_2O was found to have the most profound effect on gaseous argonscintillation light, and N_2 was found to have the least. Additionally, acorrelation between the slow component decay time and the total energydeposited with 0.01 ppm - 100 ppm O_2 contamination levels in liquid argon hasbeen established. The superiority of molecular sieves over anhydrous complexesat absorbing Ar gas, N_2 gas and H_2O vapour has been quantified using BETisotherm analysis. The efficiency of Cu and P_2O5 at removing O_2 and H_2Oimpurities from 1 bar N6 argon gas at both room temperature and -130 ^oC wasinvestigated and found to be high. A novel, highly scalable LAr re-circulationsystem has been developed. The complete system, consisting of a motorisedbellows pump operating in liquid and a purification cartridge, were designedand built in-house. The system was operated successfully over many days andachieved a re-circulation rate of 27 litres/hour and high purity.

Argon Purification Studies and a Novel Liquid Argon Re-circulation System