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# Correction of the effects of carbon dioxide and hydrogen sulfide on electrostatic cell monitors measurements of radon in water

Begy Robert-Csaba; Codrin Savin; Alida Timar-Gabor

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{
"note": "EEA and Norway Grants, EEA-RO-NO-2018-0126, 3/2019.",
"DOI": "10.1016/j.jece.2021.107040",
"container_title": "Journal of Environmental Chemical Engineering",
"language": "eng",
"title": "Correction of the effects of carbon dioxide and hydrogen sulfide on electrostatic cell monitors measurements of radon in water",
"issued": {
"date-parts": [
[
2021,
12,
21
]
]
},
"abstract": "<p>The present study shows that the presence of hydrogen sulfide and carbon dioxide in water have a negative effect<br>\non the accuracy of radon measurements in samples when an electrostatic ion collector device (RAD7) is used.CO2<br>\nconcentrations between 0.65 g/l and 5.19 g/l were generated in water samples containing 222Rn activities<br>\nranging from 23.4 &plusmn; 0.9 Bq/l to 6.7 &plusmn; 0.9 Bq/l, after which the samples were measured by a RAD7 device, and<br>\nthe results compared to the radon activity values of the gas-free samples. The same procedure was followed for<br>\nH2S concentrations from 0.125 mg/l to 3 mg/l. In both cases, a major impact was observed, the radon apparent<br>\nspecific activities decreasing exponentially with gas concentration. For a CO2 concentration of 1.29 g/l, the<br>\napparent specific activity underestimated the true value by 24.5%, while for a concentration of 5.19 g/l CO2 the<br>\ndecrease was of 57%. For H2S, the radon measured values decreased by 42.5% for concentrations as low as 0.5<br>\nmg/l, culminating in a reduction of 86.9% for 3 mg/l H2S. We are attributing these effects to 218Po neutralization<br>\nprocesses, which reduces the electrostatic efficiency of the silicon detector system. To eliminate the interferences<br>\nof these gases on RAD7 measurements, a sample preparation method was developed and tested, involving the<br>\nprecipitation and deposition of CO2 using Ca(OH)2, and H2S using Pb(NO3)2..The findings of the present study<br>\nclearly indicate that in order to perform valid radon measurements in gas-rich waters with RAD7, the effect of the<br>\ninterfering gases must be considered.</p>",
"author": [
{
"family": "Begy Robert-Csaba"
},
{
"family": "Codrin Savin"
},
{
"family": "Alida Timar-Gabor"
}
],
"volume": "10",
"type": "article-journal",
"issue": "107040",
"id": "5839747"
}
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