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• W2023641509 abstract "The controlling factors affecting the accumulation of 137Cs in marine sediment have not been investigated in detail, especially in coarse grained sediment. Eighty eight coarse marine sediment samples near Wuljin, Korea, were characterized by quantitative X-ray-diffraction (XRD), gamma-ray, and total organic carbon (TOC) analysis. Those factors were then compared. The grain size was in the range of −0.48 to 3.6 Mdϕ corresponding to sand grains. TOC content was in the range of 0.06–1.75%, and the concentration of 137Cs was <MDA to 4.0 Bq/kg-dry. The main identified minerals were general rock-forming minerals such as quartz, feldspars with minor contents of pyroxene, calcite, hornblende, a 10 Å phase of phyllosilicate assigned to biotite, and chlorite. Other clay minerals were not identified due to the large grain sizes of the investigated samples. Biotite (1–7 wt%) was the only mineral showing a positive correlation with 137Cs activity, which was first reported here, probably due to the weathered frayed edge site of biotite produced by a release of K. The samples with low TOC contents showed even better correlation between biotite content and 137Cs activity. For the entire samples, however, the TOC content showed better correlation with 137Cs activity than other single factors, indicating that biotite and organic carbon are the most important factors controlling 137Cs fixation. The combined effect of biotite and TOC for 137Cs fixation was also confirmed by multiple regression analysis (137Cs activity = 1.712 · TOC (wt%) + 0.202 · biotite (wt%) − 0.097; R2 = 0.819). The regressed slopes indicated that the 137Cs-adsorption capacity of TOC was about 8.5 times higher than that of biotite. However, the amount of 137Cs adsorbed onto biotite was 30% more than that adsorbed onto TOC due to much greater biotite content in the sediment. The role of biotite in fixing 137Cs becomes more important in sediment with coarser grains, containing little TOC." @default.
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• W2023641509 date "2007-09-01" @default.
• W2023641509 modified "2023-09-27" @default.
• W2023641509 title "The accumulation of radiocesium in coarse marine sediment: Effects of mineralogy and organic matter" @default.
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• W2023641509 doi "https://doi.org/10.1016/j.marpolbul.2007.06.003" @default.
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