A step towards accreditation: A robustness test of etching process

Leonardi, Federica; Veschetti, Miriam; Tonnarini, S.; Cardellini, F.; Trevisi, Rosabianca

doi:10.1016/j.apradiso.2015.05.002

Cited by 12 publications

(7 citation statements)

References 17 publications

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“…The relative recovery obtained for OD‐PABA at 150 μg/L (132%) is possibly due to a matrix effect caused by lake water at high concentrations of this analyte. For the other analytes, the accuracy and the precision intra‐ and interday were in accordance with the validation guideline of Association of Official Analytical Chemists (AOAC) demonstrating that the method were successfully developed for the determination of these analytes in the lake water samples of Lagoa da Conceição. A chromatogram obtained with a non‐spiked and a fortification of the sample is shown in Supporting Information Figure S8.…”

Section: Resultssupporting

confidence: 67%

“…Also, for each factor, the effect (E x ) and the normalized effect (|E x |) are given. The normalized effect indicates the influence of a variable on the method, being possible to analyze if it is significant or not . The results obtained for these two parameters are presented in Supporting Information Table S4.…”

Section: Resultsmentioning

confidence: 99%

“…A bar graph was obtained, and the results were delimited between two margins, the error margin (ME) and the simultaneous error margin (SME). Both ME and SME are important to evaluate if the method exhibits satisfactory robustness . According to the results (graph shown in Supporting Information Figure S11), only P4 factor is higher than the ME limit.…”

Section: Resultsmentioning

confidence: 99%

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A natural and renewable biosorbent phase as a low‐cost approach in disposable pipette extraction technique for the determination of emerging contaminants in lake water samples

Morés

Silva

Merib

et al. 2019

J of Separation Science

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This study proposes an efficient analytical methodology using a biosorbent (cork) as an extraction phase in disposable pipette extraction technique for the rapid determination of the emerging contaminants methyl paraben, ethyl paraben, benzophenone, 3‐(4‐methylbenzylidene) camphor and 2‐(ethylhexyl)‐4‐(dimethylamino) benzoate in lake water samples using high‐performance liquid chromatography with diode array detection. The optimized conditions were comprised of 800 μL of sample, three cycles of 30 s each for the extraction, pH 6, addition of 30% w/v of NaCl. For the desorption step, the optimized desorption conditions were achieved with 100 μL of a mixture comprised of 50% methanol and 50% acetonitrile v/v, using one cycle of 30 s. Excellent analytical performance was achieved with limits of detection of 0.6 μg/L for methyl paraben to 1.4 μg/L for 3‐(4‐methylbenzylidene) camphor, and the limit of quantitation varied from 2 μg/L for methyl paraben to 4.3 μg/L 3‐(4‐methylbenzylidene) camphor, respectively. The correlation coefficients ranged from 0.9962 for ethyl paraben to 0.9980 for methyl paraben. The method accuracy varied from 71–132%, and the intraday precision ranged from 3 to 23% (n = 3) and interday from 9 to 23% (n = 9). The robustness was evaluated through Youden and Lenth's methods and indicated no significant variations in the results.

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Section: Resultssupporting

confidence: 67%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

A natural and renewable biosorbent phase as a low‐cost approach in disposable pipette extraction technique for the determination of emerging contaminants in lake water samples

Morés

Silva

Merib

et al. 2019

J of Separation Science

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“…The average concentration of indoor radon (in the text when we speak about radon we always refer to 222 Rn) activity (Rn in the following) was estimated by using SSNTD passive dosimeters type NRPB/SSI with nuclear trace detectors CR-39 (Intercast, Europe) for two consecutive semesters (spring/summer from March to October 2018 and autumn/winter from October 2018 to April 2019). The analytical procedure was described in [18] and references within: in particular, the plastic detectors were pre-etched before use and developed with an aqueous solution of KOH 6.0 N, 75 • C for 270 min, and then the detectors were subjected to reading by means of an automated Politrack system (Mi.am, Italy). Moreover, according to INAIL (National Institute for Insurance Against Accidents at work) Laboratory's procedures [19], the correct functioning of the reading system was checked by reading "reference detectors" (i.e., detectors exposed to certified radon atmospheres) before starting a new reading cycle.…”

Section: Measure Of Indoor Radon Average Activity Concentrationmentioning

confidence: 99%

Radon Spatial Variations in University’s Buildings Located in an Italian Karst Region

et al. 2021

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In the framework of a collaboration between INAIL and University of Salento, an indoor radon survey in 54 buildings belonging to the UniSalento University (Southeast Italy) was carried out. The monitored buildings differ by type, construction period, materials, etc., and are located in an area with a morphology characterized mainly by marls, calcareous marls, and calcarenites (karst area). The sample of the survey includes 963 rooms at different floors: it consists in rooms mainly located at ground floor (67%), first floor (12%), and below ground (12%). SSNTD passive dosimeters measured the average radon activity concentration for two consecutive semesters (spring/summer and autumn/winter) from which annual radon averages were estimated for each room. The spatial variability within buildings was investigated in terms of variation between floors and among rooms at the same floor. Data analysis provides evidence that the distributions (in terms of arithmetic mean, standard deviation, median, and geometric mean) of indoor radon annual averages at ground floor and at first floor within building are very similar. This highlights that the karstic characteristics of soil and building materials affect radon levels not only below ground and at ground floor, but also at first floor. Moreover, to evaluate the spatial variability of radon among buildings or floors, the analysis of the distribution of coefficient of variation (CV) was carried out: the results show a low spatial variability with median and average values of CVs ≤ 30% both for the whole building and at different floor levels.

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“…The average radon activity concentration was measured by NRPB/SSI passive dosimeters coupled with CR-39 (Intercast, Europe) as detectors, for two consecutive semesters (March-October and October-April) by means of the analytical procedure described in Leonardi et al [18] and references within. This device, according to the protocol adopted in our laboratory, has an LLD in terms of radon exposure of 14 kBqhm −3 .…”

Section: The Radon Survey and The Samplementioning

confidence: 99%

Factors Affecting Indoor Radon Levels in Buildings Located in a Karst Area: A Statistical Analysis

Botti,

Buresti,

Caricato

et al. 2023

Atmosphere

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In this paper, the averages annual radon concentrations in buildings placed in a karst area are analyzed in order to understand which factors may affect the occurrence of high levels of radon indoor. Statistical analysis on the radon dataset is performed using analytical factors described by two or three levels according to the characteristic of the measured buildings. The factors that determine higher radon levels in terms of arithmetic mean (AM) at ground floor (GF) are mainly the presence of sedimentary calcareous rock (SCR) in walls and the direct attack or crawl space as type of foundation. At first floors (FF), the presence of walls of only SCR showed radon levels higher (in terms of AM) than the one found for walls of mixed typology. These outcomes suggest that in karstic area buildings with SCR as the main construction material and direct attack or crawl space as the type of foundation, can be considered as radon-prone buildings. Moreover, this study confirms the need to measure radon levels not only at below ground floor and at GF, but also at FF and above for buildings in karst areas with construction materials including SCR blocks.

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A step towards accreditation: A robustness test of etching process

Cited by 12 publications

References 17 publications

A natural and renewable biosorbent phase as a low‐cost approach in disposable pipette extraction technique for the determination of emerging contaminants in lake water samples

A natural and renewable biosorbent phase as a low‐cost approach in disposable pipette extraction technique for the determination of emerging contaminants in lake water samples

Radon Spatial Variations in University’s Buildings Located in an Italian Karst Region

Factors Affecting Indoor Radon Levels in Buildings Located in a Karst Area: A Statistical Analysis

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