Dissolved 210Po and 210Pb in Guarani aquifer groundwater, Brazil

Bonotto, Daniel Marcos; Caprioglio, L.; Bueno, T. O.; Lazarindo, J. R.

doi:10.1016/j.radmeas.2009.03.022

Cited by 34 publications

(14 citation statements)

References 53 publications

(60 reference statements)

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“…Statistical tests of correlation were realized among such parameters and the 210 Po and 210 Pb activity concentrations reported in S1, but none significant value was found. This also happened in other contexts, for instance, in Nordic drinking water from 328 wells (Isam Salih et al, 2002) and in GAS groundwater from 77 wells (Bonotto et al, 2009).…”

Section: Resultsmentioning

confidence: 66%

“…(3) to the spas groundwaters whose time elapsed between the sampling and counting was higher than 140 days yielded 12.6 mBq/L for the average 210 Pb activity concentration. Its application for GAS groundwaters provided a mean value~6 times lower (2 mBq/L) (Bonotto et al, 2009) due to the presence of lithologies less enriched in natural radionuclides in the Paran a basin. It is important emphasize that such 210 Pb activity concentration data represent maximum values as the use of eq.…”

Section: Resultsmentioning

confidence: 99%

“…Different methods have been used for characterizing 210 Pb and 210 Po in waters, for instance, g-rays spectrometry with HPGe detector, gas-flow proportional counting, liquid scintillation counting, ICP-MS technique, electrochemical separation or measurement of the a-particles (energy ¼ 5.3 MeV) emitted by 210 Po (Ivanovich and Harmon, 1992;Godoy and Godoy, 2006;etc.). In this study, the theoretical approach described by Bonotto et al (2009) was adopted for generating the 210 Pb and 210 Po activity concentration data. Because 210 Bi grows into equilibrium with 210 Pb in about 25 days, a good approximation of the relationship between the 210 Po and 210 Pb activity concentrations after sampling (separation from the interaction with the host rock in the aquifer) is to wait at least a time (t 1 ) of about 20e30 days (several half-lives of 210 Bi) after sampling, extract 210 Po and measure its activity concentration.…”

Section: Methodsmentioning

confidence: 99%

“…The same monitoring points were also analyzed by Bonotto (2015Bonotto ( , 2017 for the isotopes of radium ( 226 Ra and 228 Ra) and uranium ( 238 U and 234 U) in order to investigate their relative mobilities. Other Brazilian groundwater sources were also analyzed for 226 Ra,228 Ra, 210 Po and 210 Pb (Bonotto et al, 2009;Oliveira et al, 2001;Godoy et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

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Mobility indices and doses from 210Po and 210Pb activity concentrations data in Brazilian spas groundwaters

Bonotto

Oliveira

2017

Journal of Environmental Radioactivity

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Po and Pb activity concentrations in spas groundwaters occurring at São Paulo (SP) and Minas Gerais (MG) states, Brazil, have been reported in this paper with a dual purpose: to compare different indices for evaluating the radionuclides mobility into waters and to evaluate the drinking water quality from dose calculations. The waters (75 sampling points) are extensively used for drinking in public places, bottling and bathing purposes, among other. The samples were taken from springs and wells drilled at different aquifer systems inserted in Paraná and Southeastern Shield hydrogeological provinces. The WHO guideline reference value forPb and Po of 0.1 Bq/L in drinking water was not reached forPb but the Po levels were equal or above it in four spas groundwaters from MG State. The maximum WHO guidance dose level of 0.1 mSv/yr was also reached or surpassed in them. ThePb "mobility index" taking into account the ratio of the weight of the dissolved Pb per unit volume of solution to its weight per unit weight of the rock matrix yielded values in the range of 0.01-5.2 kg/m. Another "mobility index" (Preference Ratio) expressing the ratio of Pb andU in the waters divided by the ratio of Pb andU in the rock matrices provided values between 0.004 and 7994. The Pb/U activity ratios of some spas groundwaters suggested preferential U transport relative toPb into the liquid phase, whereas the ratio of the Pb toU mobility indices indicated the opposite. Such finding showed a better usefulness of the mobility indices for evaluating processes affecting the radionuclides release into the liquid phase during the water/rock interactions.

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Section: Resultsmentioning

confidence: 66%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mobility indices and doses from 210Po and 210Pb activity concentrations data in Brazilian spas groundwaters

Bonotto

Oliveira

2017

Journal of Environmental Radioactivity

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“…The isotope dilution technique was utilized to generate 210 Po activity concentration values from 209 Po and 210 Po peaks. Notwithstanding, [9] utilized Ag rather than Cu discs for Po-deposition, the 210 Po data were satisfactory, also allowing estimate the 210 Pb activity concentration according to the procedure described by [10].…”

Section: Methodsmentioning

confidence: 95%

Hydrochemical study of groundwaters from Botucatu city, São Paulo State, Brazil

Santos¹,

Bonotto²

2016

WIT Transactions on Ecology and the Environment

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This investigation was carried out at Botucatu city, São Paulo State, Brazil, and involved the study of groundwaters utilized for domestic consumption and industrial purposes. Botucatu city is situated in the recharge area of Guarani Aquifer System (GAS) in which the variegated quartzitic sandstones accumulated by eolian processes under desertic conditions and named Botucatu Formation were firstly described there. Notwithstanding, the municipality is drained by two hydrographic basins (Tietê River-north; Pardo River-south), groundwater has been extensively used there, justifying this investigation. The study involved the hydrochemical and radiometric analysis of 13 groundwater samples collected from tube wells exploiting different formations of the Paraná sedimentary basin: Botucatu, Pirambóia, Serra Geral, Marília, Adamantina, and Santo Anastácio. The pH, silica, major ions, gross alpha radioactivity, gross beta radioactivity and activity concentration of dissolved 210 Po and 210 Pb were measured at LABIDRO-Isotopes and Hydrochemistry Laboratory, IGCE-UNESP-Rio Claro, Brazil, and compared with guideline reference values for drinking water quality. The results of the hydrochemical analysis were compared with the 1469 Ordinance of the Brazilian Health Ministry. The Piper diagram permitted to classify hydrochemically the samples, whereas the radioactivity levels were compared with the WHO guideline reference values for checking if they were appropriate for human consumption in terms of the parameters analyzed.

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Hydrochemical and radiometric evaluation of fresh and thermal waters from Araxá city (Minas Gerais, Brazil)

Bonotto

2021

Environ Geochem Health

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Dissolved 210Po and 210Pb in Guarani aquifer groundwater, Brazil

Cited by 34 publications

References 53 publications

Mobility indices and doses from 210Po and 210Pb activity concentrations data in Brazilian spas groundwaters

Mobility indices and doses from 210Po and 210Pb activity concentrations data in Brazilian spas groundwaters

Hydrochemical study of groundwaters from Botucatu city, São Paulo State, Brazil

Hydrochemical and radiometric evaluation of fresh and thermal waters from Araxá city (Minas Gerais, Brazil)

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