Determination of ¹²⁹I in aerosols using pyrolysis and AgI–AgCl coprecipitation separation and accelerator mass spectrometry measurements

Abstract

A novel method was developed for the determination of 129I in aerosol samples with the apparent advantages of high sensitivity and small sample size requirement.

Ultra-Sensitive Determination of Particulate, Gaseous Inorganic and Organic Iodine-129 and Iodine-127 in Ambient Air

“…The detection limit for particulate 129 I is about 2 times lower than that of the previously reported method for a large volume sampler (0.13 × 10 5 atoms m −3 ), 35 perfectly satisfying the requirement of particulate 129 I analysis in ambient air (0.07 × 10 5 −5.37 × 10 9 atoms m −314 and 1−30 × 10 5 atoms m −3 in this study). For GII and GOI species, there is no recently reported data.…”

“…In terms of the TMAH/glycerol-impregnated glass fiber filter for GII, the organic reagents typically have an ignition point (e.g., flash point of 177 °C for glycerol), which would lead to quick burning if a relatively high temperature is applied, and produce a large volume of CO 2 and other gases (e.g., CO), leading to ejection of trapping solution and even explosion of the working tube, as reported in our previous work. 35 Thus, the temperature control program was mainly focused on the burning/carbonization of the filter material at relatively lower temperature (<400 °C). The temperature of the furnace was first increased from room temperature to 250 °C within 60 min, dwelled for 30 min, and then was increased from 250 to 400 °C within 30 min and dwelled for 20 min.…”

“…The analytical accuracy for 129 I in PI has been validated by spiking the IAEA 375 soil standard on the blank filter in our previous work. 35 There is no available 129 I standard for gaseous samples to validate the analytical accuracy of 129 I in GII and GOI. The sampling efficiency of impregnated fiber filters for GII and activated carbon for GOI is the major source of analytical uncertainty, which is dependent on the air flow rate (i.e., the dwell time of iodine-containing gas in sampling media), the ambient temperature, and humidity besides the filter and activated charcoal cartridge, which will be further investigated in the future.…”

“…Particulate Iodine. Separation of iodine from particulates collected on the filter has been reported in our previous study, 35 and details are described in the Supporting Information. In brief, PI was separated from the glass fiber filters by combustion using an optimized temperature control program 1 (Figure S2).…”

Temporal variation of &lt;sup&gt;129&lt;/sup&gt;I and &lt;sup&gt;127&lt;/sup&gt;I in aerosols from Xi'an, China: influence of East Asian monsoon and heavy haze events

“…CC BY 4.0 License. plasma mass spectrometry (ICP-MS, Agilent 8800, USA) for determination of 129 I/ 127 I ratios and 127 I concentrations, respectively, as previously reported (Zhang et al, 2018b). The sample collection and preparation procedure are described in detail in the supplementary information (SI-1).…”