TY  - JOUR
AB  - We obtained the rare data on low activity concentration of Am-241 in the surface seawater collected at about 210 km northeast of Fukushima Daiichi Nuclear Power Plant (FDNPP) on 29 April 2011. The concentration of U-236, U-238, Pu-239, Pu-240, Cs-134 and Cs-137 in that seawater was also determined and the atomic ratio U-236/U-238 and Pu-240/Pu-239 was calculated. The activity concentration of Cs-137 compared to that before the incident and the equal activity ratio of Cs-134/Cs-137 clearly indicate that the seawater was contaminated by the radioactive Cs discharged from the FDNPP, while the activity concentration of Am-241 as well as U-236, Pu-239 and Pu-240 was in the range of the values reported before the incident. Am-241 in the aerosols collected at about 120 km from the FDNPP, in which FDNPP derived U-236 and Pu isotopes were found, was analyzed. However, no significant larger amount compared to U-236 and Pu239+240 was found.
AU  - Shinonaga, T.
AU  - Gückel, K.
AU  - Yamada, M.*
AU  - Gamo, T.*
AU  - Steier, P.*
AU  - Christl, M.*
AU  - Wang, Z.*
AU  - Czeslik, U.*
AU  - Tazoe, H.*
AU  - Tschiersch, J.
C1  - 61904
C2  - 50301
CY  - 358-5 Yamabuki-cho, Shinjuku-ku, Tokyo, 162-0801, Japan
SP  - 33-38
TI  - A record of 241Am, 236U, 238U, 239Pu, 240Pu, 134Cs and 137Cs in surface seawater and 241Am in aerosols shortly after the FDNPP incident occurred.
JO  - Geochem. J.
VL  - 55
IS  - 1
PB  - Geochemical Soc Japan
PY  - 2021
SN  - 0016-7002
ER  - 

TY  - JOUR
AB  - Main objectives of this study were to investigate whether humic substances (HS) exist in hot groundwater from deep basinal aquifers waters and to provide basic knowledge on humic (HA) and fulvic acids (FA) isolated from these fluids. Water sampling and HS isolation was carried out in three consecutive years from wells tapping the aquifers of the Pannonian Basin (Southeast Hungary). The isolated humic acid and fulvic acid samples were studied by elemental analysis, Fourier transform infrared (FTIR) spectroscopy, and Electrospray Ionization Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (ESI-FT-ICR/MS). We found that modified sampling (acidification of water samples either immediately or after cooling down) had no traceable effect on the properties of isolated HAs and FAs. The quantity and quality of humic materials did not change in three years. The analytical results clarified distinctive chemical characters of HS in the deep aquifer groundwater compared to the Suwannee river fulvic acid (SRFA) as a reference. In addition, we stated that aliphatic content of isolated HAs and FAs increased with increasing aquifer depth and temperature, but the aromaticity and heteroatom content decreased in both fractions.
AU  - Kovacs, K.*
AU  - Gáspár, A.
AU  - Sajgó, C.*
AU  - Schmitt-Kopplin, P.
AU  - Tombacz, E.*
C1  - 7773
C2  - 29872
SP  - 211-224
TI  - Comparative study on humic substances isolated in thermal groundwaters from deep aquifers below 700 m.
JO  - Geochem. J.
VL  - 46
IS  - 3
PB  - Geochemical Soc. Japan
PY  - 2012
SN  - 0016-7002
ER  -