Thesis for the Degree of Doctor of Philosophy - DTU Orbit

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Iodine as iodide in the final back extracted solution was transferred to a centrifuge tube, and 1.5mL of 3M HNO3 was added. To the solution 1mL of 1M AgNO3 was added and mixed. The AgI precipitate was finally dried at 60-70 °C, and then ground to powder. The silver iodide was mixed with niobium powder and pressed into a copper holder for measurements of 129 I by accelerator mass spectrometry (AMS) at the Tandem Laboratory, Uppsala University using a terminal voltage of 3.5MV. The statistical error of the analysis including mainly measurement errors at 1 standard deviation was
maximum values is at 0.03-0.06×10 9 atoms/L and 0.5-0.7 ×10 9 atoms/L in the studied lakes (Tables 1 and 2). Discussion Because of the low concentration of organic iodine encountered in seawater, recently works on speciation analysis in seawater are focused on iodide and iodate while organic iodine being calculated as difference between the total inorganic iodine and total iodine. Although high concentrations of organic iodine have been reported in fresh water compared to seawater (Reifenhäuser and Heumann, 1990), studies concerning quantification of aquatic organic iodine are still very limited. Photochemical decomposition (H2O2)/UV or dehydrohalogenation (NaOH/ ethanol) of aquatic organic iodine has been previously employed (Wong & Cheng, 2001; Schwehr, 2003) and the results show a discrepancy of up to 40% or higher, depending on methods. Photochemical decomposition ((H2O2)/UV) of dissolved organic iodine in seawater have shown to produce iodide (Wong & Cheng, 2001). A question of whether photochemical destruction of organic matter occurs in the same time with formation in small proportion of iodine organic matter remains uncertain (Wong & Cheng, 2001; Moore & Zafiriou, 1994). Conventional, organic matter destruction can be performed by hydrolysis, reductions, thermal and wet oxidation and thermal methods (Stevenson, 1994). Oxidation methods include oxidizing agents, such as potassium permanganate (KMnO4), disodium peroxodisulphate (Na2S2O8), or sodium hypochlorite (NaOCl). In this study the iodine organic matter was destroyed by using NaClO in alkaline medium at 150 0 C for 3h. Excepting few locations in Denmark were organic iodine-127 accounts for 50% of the total iodine-127 and the precipitation sample collected form Rasback, Sweden the iodine (both isotopes) associated organic matter calculated by subtracting inorganic iodine (iodide + iodate) from 7
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Chemical Speciation Analysis and En
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Thesis for the Degree of Doctor of
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Abstract This thesis deals with che
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environment since they reflect the
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organiske jodformer. Adsorption af
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None of this would have been possib
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Abbreviations and acronyms b+ - pos
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3.1 Analytical Development………
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Table 1 Some properties of iodine P
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In soils/sediments iodine occurs as
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Table 2 Nuclear properties of iodin
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Liquid scintillation counting (LSC)
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The bioavailability of radioactive
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data (Englund et al., 2010; Hou et
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2. Analytical procedures used in th
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2.3 Quantification of total iodine
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Fig. 5 Quantification of total iodi
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iodate were measured by counting 12
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Fig. 6 Sequential extraction proced
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a Fig. 8 Calibration curve for (a)
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experiment was subjected to combust
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Table 7 Adsorption of iodine specie
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numbers 11-14), which is about the
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marine environment from nuclear fue
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127 I - (ppb) 127 IO3 - (ppb) a b 1
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Although the oxygen concentration d
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129 I TBq 2,00E+00 1,80E+00 1,60E+0
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• Adsorption of iodine species on
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Reference Aldahan A, Kekli A, Possn
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Fuge R& Johnson C. 1986. The geoche
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Lo´pez-Gutie´rrez JM, Garcı ´a-
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Shinohara K. 2004. Measurement and
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http://www.irsn.fr/EN/news/Document
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Review Analytica Chimica Acta 632 (
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Table 1 Nuclear properties and prod
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Fig. 2. Liquid discharges of 129 I
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Fig. 5. Schematic diagram and pictu
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129 I in iodide and iodate is then
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Fig. 8. Diagram of air sampler for
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Fig. 10. Iodine L3-edge (a) and K-e
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analysis of 129 I in water sample a
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Yi P, Aldahan A, Hansen V, Possnert
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FIGURE 1. Sampling sites (the red s
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FIGURE 3. Horizontal distribution o
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FIGURE 5. Time series data of 129 I
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Environmental Science & Technology
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prepared using KI and KIO3. No diff
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of their contribution to the Baltic
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Fig. S-1 Sampling sites (the red so
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Fig. S-3 Vertical distribution of I
Page 101 and 102: Fig. S-5 Marine discharges function
Page 103 and 104: Fig.S-7 Relationship between I-129
Page 105 and 106: Table S-1 Results of I-129 and I-12
Page 107 and 108: S17
Page 109 and 110: Paper III Hansen,V., Yi, P., Hou, X
Page 111 and 112: conversion process between iodide a
Page 113 and 114: Table 1 Analytical results of 129 I
Page 115 and 116: August April I-129 iodide ( 10 8 at
Page 117 and 118: References Aldahan A, Kekli A, Poss
Page 119 and 120: Partition of iodine ( 129 I and 127
Page 121 and 122: Norway (Table 1). CTD-casts with ox
Page 123 and 124: 5. Discussion 5.1. Separation of hu
Page 125 and 126: In the present study 40e60% of 129
Page 127 and 128: Hutta, M., Gora, R., 2003. Novel st
Page 129 and 130: Analysis of 129 I and 127 I in arch
Page 131 and 132: et al., 2002). Due to the fact that
Page 133 and 134: espectively. The iodine was leached
Page 135 and 136: salinities in the same area. Apart
Page 137 and 138: North Sea. 129 I/ 127 I ratios in w
Page 139 and 140: Table 2 Analytical results of 129-I
Page 141 and 142: 129 I/ 127 I 1,40E-07 1,20E-07 1,00
Page 143 and 144: References Aldahan A, Englund E, Po
Page 145 and 146: O’Dowd, C.; Jimenez, J. L.; Bahre
Page 147 and 148: Iodine ( 129 I and 127 I) speciatio
Page 149 and 150: water in winter by molecular oxygen
Page 151: 0.2 M KNO3. The effluent and the wa
Page 155 and 156: into the English Channel from the L
Page 157 and 158: References Aldahan A, Kekli A, Poss
Page 160 and 161: Risø-PhD-81(EN)
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Thesis for the Degree of Doctor of Philosophy - DTU Orbit

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