Bias arising from 222Rn contamination in standardized methods for biobased content determination and a simple removal method

Accounting for Overcounting Induced by ²²²Rn Contamination in ¹⁴C Measurements Performed with Liquid Scintillation Counting

“…Hood et al (1989) reported that 222 Rn can be removed during dynamic vacuum recovery of benzene at −78°C. Tudyka et al (2021) described a method of removing 222 Rn using four freezepump-thaw cycles at either −20°C (with a H 2 O ice and NaCl mixture) or −72°C (with a dry ice and ethanol mixture) to bring 222 Rn contamination to the background level.…”

Testing the Methods for Determination of Radiocarbon Content in Liquid Fuels in the Gliwice Radiocarbon and Mass Spectrometry Laboratory

“…However, radon ( 222 Rn) inevitably contaminates these samples and can artificially inflate the biocarbon content. To remove 222 Rn from the benzene samples before measurements without waiting 30 days, the resublimation method was used (Tudyka et al 2021). The key point of this method was to test the effectiveness of rapid radon removal.…”

Study of Bio-Based Carbon Fractions in Tires and Their Pyrolysis Products

“…Benzene was dried by removal of water molecules with sodium metal and atmospheric radon was removed by keeping the benzene sample in a refrigerator for a month, since the half-life of radon is 3.8 days. For the removal of radon, we also followed a re-sublimation process for the two samples (CONT-1 and PCO-2), (Tudyka et al 2021) and involves a mixture of dry ice with ethanol (-78°C) or ice with salt (-21°C). GdS-4327 5.08 ± 0.18 0,07 71.7 ± 3.5 4.9 ± 0.17 4.8 ± 0.17 4.5 ± 0.16 GdA-6615 5.14 ± 0.11 5.0 ± 0.11 4.9 ± 0.10 4.6 ± 0.10 TRa-16679 5.17 ± 0.08 5.0 ± 0.08 4.9 ± 0.08 4.6 ± 0.07 5 rCB-3 Recovered Carbon Black GdS-4394 6.89 ± 0.18 19.31 without TRa-16680 0.02 78.9 ± 1.5 6.7 ± 0.17 6.5 ± 0.17 6.2 ± 0.16 GdA-6616 6.92 ± 0.12 6.7 ± 0.12 6.6 ± 0.11 6.2 ± 0.11 TRa-16680 6.29 ± 0.18 6.1 ± 0.17 6.0 ± 0.17 5.6 ± 0.…”