Abstract
In present study, Lead-210 (Polonium-210) activity concentrations were indirectly obtained by utilizing alpha spectrometry. Sediment chronology was determined by using modified CRS model. Average sediment accumulation rates are 0.351, 0.324, 0.222 g cm -2 y -1 in S-1, S-2, S-3 stations respectively. With reference to atmospheric 210 Pb flux (29 mBq cm -2 y -1 ) Lake Karagol has extra outer 210 Pb input (soil erosion) from the catchment area. In terms of Enrichment Factor (EF), heavy metal concentrations are lower than the anthropogenic values. So it can be said that the elements except Au originate from the continental supply. Au has unexpectedly too high level EF value (58.22) in northern station (S-1) of the Lake Karagol. It corresponds to time interval from 2004 to nowadays. However Pollution Load Index (PLI) says different consequences from the EF values. PLI value has only baseline levels of pollutants in northern part of the Lake Karagol as it shows progressive deterioration of the site for southern part of the Lake Karagol.
Highlights
The naturally occurring radioactive nuclide Lead210 (210Pb) has often been used in environmental studies because Polonium (210Po) and 210Pb are well known to be particle reactive in marine environment [1]. 210Po is an alpha particle emitter in the Uranium-238 (238U) decay chain with high energy and it is a naturally occurring radionuclide formed by the beta decay of its grandparent 210Pb by the agency of Bismuth-210 (210Bi). 210Pb and 210Po have been used extensively as an important tracer for particle transport, studying processes of chemical scavenging, atmospheric analysis, describing the sediment type for pollution point of view (210Po/210Pb ratio), geochronology and dating sediments in marine environment [2]
Lead dating models [4,5,6,7,8,9] have entirely applied in lake sediments and they have prosperously improved by new kind of approaches [10,11,12,13,14,15,16,17,18,19,20,21] to the models for advance correctness of the chronology
The total 210Pb activities are ranged from 109.6 ± 8.3 Bq kg-1 to 54.2 ± 3.2 Bq kg-1 along the core in S-1
Summary
The naturally occurring radioactive nuclide Lead210 (210Pb) has often been used in environmental studies because Polonium (210Po) and 210Pb (half-life is 22.3 y) are well known to be particle reactive in marine environment [1]. 210Po (half-life is 138 d) is an alpha particle emitter in the Uranium-238 (238U) decay chain with high energy and it is a naturally occurring radionuclide formed by the beta decay of its grandparent 210Pb by the agency of Bismuth-210 (210Bi). 210Pb and 210Po have been used extensively as an important tracer for particle transport, studying processes of chemical scavenging, atmospheric analysis, describing the sediment type for pollution point of view (210Po/210Pb ratio), geochronology and dating sediments in marine environment [2]. Determination of this ratio in different type of samples such as in sediment profiles, shallow and. Investigation of radioactive disequilibria about the pairs 210Po - 210Pb and 210Pb – 226Ra within the oceanic water column determines the rates of scavenging processes [3]. Character of the 210Pb distribution is highly descriptive for model choice Another significand parameter is atmospheric 210Pb flux. If high supply of 210Pb concentration is existing in any station, it will indicate sediment focusing or significant amount of contribution from the catchment area [22]
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