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首页> 外文期刊>Environmental toxicology and chemistry >ACCUMULATION OF ~(137)Cs BY LARVAE OF THE MIDGE CHIRONOMUS RIPAR1US FROM SEDIMENT: EFFECT OF POTASSIUM
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ACCUMULATION OF ~(137)Cs BY LARVAE OF THE MIDGE CHIRONOMUS RIPAR1US FROM SEDIMENT: EFFECT OF POTASSIUM

机译：幼虫从沉积物中积累〜（137）Cs的影响：钾的影响

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We studied the effect of potassium on the uptake of radiocesium from sediment by larvae of the midge Chironomus riparius. Sediment ingestion rate was determined for one week. After 24 h the gut content remained constant, indicating that equilibrium was reached between sediment ingestion and sediment elimination. These data were used to account for radiocesium present in the gut in subsequent uptake experiments. Reference sediment was equilibrated with solutions containing different concentrations of potassium: 1, 10, 100, and 1,000 μM. Adsorption of ~(137)Cs to the sediment was investigated. Three different radiocesium levels (0.3, 0.6, and 1.2 KBq/ml) were applied at the four different potassium levels. In all cases more than 94% of all radiocesium was adsorbed to the sediment within 48 h. The sediment, equilibrated with the four different potassium levels, was spiked with a constant amount of 296 Bq/ml ~(137)Cs. Accumulation by midge larvae was followed for one week, and subsequently elimination was followed for another week. No significant differences in radiocesium levels in midge larvae among the treatments were found after one week of exposure. However, using a one-compartment accumulation model, a small but significant effect of potassium in water and sediment on the uptake and elimination rate constants (k_a and k_e was found. These results indicate that although differences were rather small, radiocesium accumulation decreased with increasing potassium level in the sediment.
机译：我们研究了钾对the蚊（Chironomus riparius）幼虫从沉积物中摄取放射性铯的影响。确定沉积物摄入率一周。 24小时后，肠道含量保持恒定，表明在沉积物摄入和沉积物消除之间达到了平衡。这些数据用于说明随后的摄取实验中肠内存在的放射性铯。用含有不同浓度的钾（1、10、100和1,000μM）的溶液平衡参考沉淀物。研究了〜（137）Cs对沉积物的吸附。在四个不同的钾水平下应用了三个不同的放射性铯水平（0.3、0.6和1.2 KBq / ml）。在所有情况下，在48小时内，超过94％的放射性铯被吸附到沉积物中。用恒定的296 Bq / ml〜（137）Cs掺加与四种不同钾水平平衡的沉积物。蚊虫幼虫的积累持续了一个星期，随后的消灭又持续了一周。暴露1周后，各处理之间的中龄幼虫的放射性铯水平无显着差异。但是，使用单室累积模型，发现水和沉积物中钾对吸收和消除速率常数（k_a和k_e）的影响很小但很显着。这些结果表明，尽管差异很小，但放射性铯的积累却随着增加而降低。沉积物中的钾水平。

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