Defining a standard method to measure the total and bioavailable concentration of fluorine in New Zealand soils

Geretharan, Thangavelautham; Jeyakumar, Paramsothy; Bretherton, Mike; Anderson, Christopher

doi:10.1016/j.microc.2018.06.018

Cited by 9 publications

(3 citation statements)

References 42 publications

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“…4). Fluoride levels for both matrices are in good agreement with literature data for comparable solid samples (Schuppli 1985;Codling et al 2014;Geretharan et al 2018).…”

Section: Total Fluorine (Tf) and Extractable Organic Fluorine (Eof) Analysis Of Pfas-contaminated Soils And Sludgessupporting

confidence: 89%

Investigation of per- and polyfluoroalkyl substances (PFAS) in soils and sewage sludges by fluorine K-edge XANES spectroscopy and combustion ion chromatography

Roesch

Vogel

Huthwelker

et al. 2021

Environ Sci Pollut Res

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For the first time, fluorine K-edge X-ray absorption near-edge structure (XANES) spectroscopy was applied to detect per- and polyfluoroalkyl substances (PFAS) in various soil and sewage sludge samples. The method can be used to determine the speciation of inorganic and organic fluorides, without pre-treatment of solid samples. Therefore, XANES spectra of several inorganic fluorides as well as selected fluorinated organic compounds were recorded. While inorganic fluorides partially exhibit a variety of sharp spectral features in the XANES spectrum, almost all inspected organofluorine compounds show two distinct broad features at 688.5 and 692.0 eV. Moreover, the peak intensity ratio 688.5 eV/692.0 eV in the PFAS XANES spectrum can be inversely correlated to the chain length of the perfluoro sulfonic acid group. The detection of targeted PFAS by bulk-XANES spectroscopy in combination with linear combination fitting in soils and sewage sludges was not applicable due to the low organic fluorine to total fluorine ratio of the samples (0.01–1.84%). Nonetheless, direct analysis of pure PFAS revealed that analysis of organofluorine species might be achieved in higher concentrated samples. Furthermore, quantitative measurements by combustion ion chromatography (CIC) evaluated as sum parameters extractable organically bound fluorine (EOF) and total fluorine (TF) emphasize that besides soils, sewage sludges are a significant source of organic fluorine in agriculture (154–7209 µg/kg).

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“…4). Fluoride levels for both matrices are in good agreement with literature data for comparable solid samples (Schuppli 1985;Codling et al 2014;Geretharan et al 2018).…”

Section: Total Fluorine (Tf) and Extractable Organic Fluorine (Eof) Analysis Of Pfas-contaminated Soils And Sludgessupporting

confidence: 89%

Investigation of per- and polyfluoroalkyl substances (PFAS) in soils and sewage sludges by fluorine K-edge XANES spectroscopy and combustion ion chromatography

Roesch

Vogel

Huthwelker

et al. 2021

Environ Sci Pollut Res

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“…Prior to the Ex‐F extraction, the hot water‐soluble F fraction was removed (by shaking 0.5 h at 60 °C; soil: solution ratio = 1:10) in order to discriminate the Ex‐F from the soluble fraction. Res‐F was determined on the residue with the method advised by Geretharan et al 33 . The total F was obtained by summing the different F fractions.…”

Section: Methodsmentioning

confidence: 99%

“…Different forms of F in soil (exchangeable F (Ex-F), F bound to iron/manganese (Fe/Mn) oxides (Fe/Mn-F), F bound to organic matter (OM-F) and residual F (Res-F)) were determined by sequential extraction following the method by Berger et al 32 Prior to the Ex-F extraction, the hot water-soluble F fraction was removed (by shaking 0.5 h at 60°C; soil: solution ratio = 1:10) in order to discriminate the Ex-F from the soluble fraction. Res-F was wileyonlinelibrary.com/jsfa determined on the residue with the method advised by Geretharan et al 33 The total F was obtained by summing the different F fractions. Both F concentration of the plant samples digest solution and soil samples extraction solutions were determined potentiometrically using a fluoride ion-selective electrode (ISE, Thermo Scientific Orion 9609BNWP, Chelmsford, Massachusetts, USA; measurement range: from 10 −6 mol L −1 to a saturated F − solution).…”

Section: Chemical Analysesmentioning

confidence: 99%

Fluoride uptake and translocation in food crops grown in fluoride‐rich soils

et al. 2020

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BACKGROUND: The East African Rift Valley (EARV) area is characterized by an intense volcanic activity, which largely influences the nature of soils, ground and surface waters causing a transfer of fluoride from volcanic emissions to the environment. Field experiments were conducted in fluorine-contaminated areas of Ngarenanyuki (Arumeru district) in north Tanzania. In order to evaluate the potential fluoride exposure from diet and the related health risk for the local population, the content of fluoride in soil and plant tissues was assessed, focusing on the edible portions (leaves, fruits or seeds) of the main cultivated and consumed food crops in the area. RESULTS: Average fluoride contents of 8.0, 11.4, 11.3 and 14.2 mg kg −1 of dry matter were observed respectively for maize (Zea mays L.), tomato (Lycopersicon esculentum Mill.), bean (Phaseolus vulgaris L.) and kale (Brassica sp. pl.) edible parts. The cumulative estimated average daily dose (EADD) ranged from 0.026 to 0.165 mg F d −1 kg −1 among different rural population groups and considering two different hypotheses of absorption fraction (75% or 100%), i.e. the amount of fluoride that is absorbed during the digestion process. The associated hazard index (HI) values varied from 0.43 to 2.75. CONCLUSIONS: Considering the dietary habits of the local population, the outcomes of the present study suggest that the investigated crops can substantially contribute to fluoride related diseases, especially in earlier ages.

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Fluorine and white clover: Assessing fluorine's impact on Rhizobium leguminosarum

et al. 2020

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The soil fluorine (F) concentration in New Zealand agricultural soils has increased with time as a direct result of the widespread application of phosphate fertilizer to land. Elevated soil F concentrations may potentially harm soil microorganisms, which are important for nutrient cycling and soil formation. Rhizobium leguminosarum is a N2–fixing soil bacterium that is a fundamental component in New Zealand legume‐based pastoral farming. Any impact of F on Rhizobium leguminosarum would have an adverse effect on New Zealand pasture production. In this study, F toxicity to Rhizobium leguminosarum was examined as a first step to develop F guideline values for New Zealand agricultural soils. Bottle‐based experiments were conducted to examine the effect of the F− ion on Rhizobium–white clover (Trifolium repens L.) symbiosis by observing nodule morphology and growth. Results indicate that the F− concentration that causes 10% inhibition of Rhizobium respiration (IC10) for F− toxicity to Rhizobium leguminosarum was >100 mg F− L−1. Significant morphological changes occurred when Rhizobium was exposed to F concentrations of 500 and 1000 mg L−1. Both light and transmission electron micrographs confirmed that the Rhizobium leguminosarum–white clover interaction was not influenced by F− concentrations >100 mg L−1. The toxic F− concentration for Rhizobium leguminosarum determined in this study is orders of magnitude higher than the F− concentration in New Zealand agriculture soils under “normal conditions.” There appears to be no indication of imminent risk of soil F to Rhizobium leguminosarum.

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Defining a standard method to measure the total and bioavailable concentration of fluorine in New Zealand soils

Cited by 9 publications

References 42 publications

Investigation of per- and polyfluoroalkyl substances (PFAS) in soils and sewage sludges by fluorine K-edge XANES spectroscopy and combustion ion chromatography

Investigation of per- and polyfluoroalkyl substances (PFAS) in soils and sewage sludges by fluorine K-edge XANES spectroscopy and combustion ion chromatography

Fluoride uptake and translocation in food crops grown in fluoride‐rich soils

Fluorine and white clover: Assessing fluorine's impact on Rhizobium leguminosarum

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