Determination of trace halogens in rock samples by radiochemical neutron activation analysis coupled with the k0-standardization method

Ozaki, H.; Ebihara, Mitsuru

doi:10.1016/j.aca.2006.10.032

Cited by 30 publications

(32 citation statements)

References 13 publications

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“…The I mass fractions determined for JB‐2 and JR‐1 are close to the values of Chai and Muramatsu () and Ozaki and Ebihara () (Table ). The mass fractions of I determined for JB‐2, JR‐1 and BHVO‐2 are also within the large ranges of values reported by Balcone‐Boissard et al .…”

Section: Resultssupporting

confidence: 85%

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Halogens (F, Cl, Br, I) in Thirteen USGS, GSJ and NIST International Rock and Glass Reference Materials

Kendrick

D'Andres

Holden

et al. 2018

Geostandard Geoanalytic Res

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Fluorine, Cl, Br and I measurements are reported for eight international rock reference materials (BHVO‐2, BCR‐2, BIR‐1a, RGM‐2, AGV‐2, GSP‐2, JB‐2 and JR‐1), and new F data are reported for five silicate glass reference materials (NIST SRM 610 and 612, BHVO‐2G, BCR‐2G and BIR‐1G). Fluorine was measured by SHRIMP in the silicate glasses and in Li‐borate flux glasses prepared from the rock powders. Chlorine, Br and I were measured in vacuum‐encapsulated rock powders by the noble gas method (extended 40Ar/39Ar methodology). The methods yield reliable results: Fluorine has a repeatability of 1–16% in the flux glasses compared with 2–4% in the silicate glasses, which suggests incomplete homogenisation during flux melting, but F was not lost during fusion of flux glasses at 1080 °C. The noble gas method gave repeatability of 1–2% for samples included in a single irradiation and intermediate precision of 2% for Cl, 2–3% for Br and 3–10% for I in samples included in two irradiations. The accuracy of the measurements varies from 5% to 10%, based on the repeatability of our results, the agreement of different calibration procedures and uncertainty in experimentally determined neutron capture cross sections. Our results significantly improve upon the precision with which some of the halogens have been characterised in the selected reference materials previously.

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Section: Resultssupporting

confidence: 85%

“… Literature values for rock reference materials (Shinonaga et al . , Michel and Villemant , Chai and Muramatsu , Ozaki and Ebihara , Balcone‐Boissard et al . , Wang et al .…”

Section: Resultsmentioning

confidence: 99%

Halogens (F, Cl, Br, I) in Thirteen USGS, GSJ and NIST International Rock and Glass Reference Materials

Kendrick

D'Andres

Holden

et al. 2018

Geostandard Geoanalytic Res

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“…A cadmiumlined irradiation position in the reactor was used to attenuate the Na Cl Mn signal that will interfere with 128 I (Ozaki and Ebihara, 2007). Monitors of Au and Al were used.…”

Section: Total Iodine* Concentration Determinationmentioning

confidence: 99%

“…RNAA is one of the most sensitive analytical methods to measure halogens in trace amounts in geochemical samples (Ebihara et al, 1992;Ebihara et al, 1997;Ozaki and Ebihara, 2007) and yields higher iodine* measurements. Taking into account the possible variability of the iodine* content of the sub-samples used for this comparison of measurement methods, the value obtained with HNO 3 digestion remains in an acceptable range.…”

Section: Total Iodine* Content Measurement Methodsmentioning

confidence: 99%

Natural iodine in a clay formation: Implications for iodine fate in geological disposals

Claret

Lerouge

Laurioux

et al. 2010

Geochimica et Cosmochimica Acta

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Iodine is one of the most problematic radioisotopes in the context of nuclear waste geological disposal due to its high mobility. Considerable effort has been dedicated to the measurement of its potential retardation during diffusive transport leading to conflicting results, from no retardation to significant retardation, leading in turn to considerable debate. The present study aims at providing new insights into this aspect of the iodine problem by careful quantification of iodine reservoirs in the Callovian-Oxfordian (COx) clay rock taken here as model material for these studies. The present study confirmed the ubiquitous presence of iodine at 1-5 mg kg -1 level in the COx clayey formation. The iodide concentration level in the porewater is also confirmed at a value in the range ~20-40 µmol L -1 , i.e. higher than the expected range of radio-iodine concentration in the far-field of the storage. Surprisingly, most of the iodine was found not to be associated with organic matter but rather in an inorganic form associated with carbonate minerals. This result has potentially significant implications for the fate of radio-iodine. In undisturbed far-field conditions, most natural iodine would not be accessible for isotopic exchange with radioactive iodine, reducing the effective Kd to negligible values. During laboratory experiments, good monitoring of the geochemical parameters (at least the Eh, pH, P CO2 , [Ca] and [Mg]) is mandatory to avoid iodine-bearing carbonate precipitation and to enable rigorous interpretation of the iodide diffusion/retention experiments.2

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“…The need for reliable determination of iodine at ultra-trace levels is thus significant. Several analytical methodologies have been applied for this purpose, including ion chromatography (IC) [1][2][3], gas chromatography-mass spectrometry (GC-MS) [4,5], radiochemical neutron activation analysis (RNAA) [6][7][8], accelerator mass spectrometry AMS [9][10][11] inductively coupled plasma optical emission spectrometry (ICP-OES) [12][13][14][15] and, most recently, inductively coupled plasma mass spectrometry (ICP-MS) [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Ultra-trace determination of iodine in sediments and biological material using UV photochemical generation-inductively coupled plasma mass spectrometry

Grinberg

Sturgeon

2009

Spectrochimica Acta Part B: Atomic Spectroscopy

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Determination of trace halogens in rock samples by radiochemical neutron activation analysis coupled with the k0-standardization method

Cited by 30 publications

References 13 publications

Halogens (F, Cl, Br, I) in Thirteen USGS, GSJ and NIST International Rock and Glass Reference Materials

Halogens (F, Cl, Br, I) in Thirteen USGS, GSJ and NIST International Rock and Glass Reference Materials

Natural iodine in a clay formation: Implications for iodine fate in geological disposals

Ultra-trace determination of iodine in sediments and biological material using UV photochemical generation-inductively coupled plasma mass spectrometry

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