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Presence and possible origin of positive Eu anomaly in shoot samples of Juncus effusus L.
Journal of Trace Elements in Medicine and Biology ( IF 3.6 ) Pub Date : 2019-11-06 , DOI: 10.1016/j.jtemb.2019.126432 Karina Krzciuk 1 , Agnieszka Gałuszka 1
Journal of Trace Elements in Medicine and Biology ( IF 3.6 ) Pub Date : 2019-11-06 , DOI: 10.1016/j.jtemb.2019.126432 Karina Krzciuk 1 , Agnieszka Gałuszka 1
Affiliation
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BACKGROUND
The rare earth elements (REE) are non-essential elements for plants. They stimulate plant growth at low doses, but at high levels are phytotoxic. There are differences in concentrations of REE in various organs of the same plant species, but the normalized REE patterns can be very similar in samples of the same species collected in different locations. Here we compare normalized REE curves in above-ground samples of Juncus effusus L. (common rush, soft rush) collected from sites with different land-use types.
METHODS
The concentrations of rare earth elements were measured in 55 shoot samples of J. effusus L. The samples were collected from 15 sampling sites located in the Holy Cross Mts., south-central Poland and analyzed with the use of inductively coupled plasma mass spectrometry (ICP-MS). The results were normalized to the North American Shale Composite and anomalies of different elements were calculated.
RESULTS
Total REE concentrations varied from 0.028 mg/kg to 2.7 mg/kg. The samples were enriched in the light REE (from La to Eu) with the highest concentrations of La and Ce. The North American Shale Composite (NASC)-normalized REE curves were roughly similar in all samples except for two samples collected in the acid mine drainageaffected areas.
CONCLUSION
All samples showed positive europium anomalies in NASC-normalized REE concentration patterns. The most probable explanation of this is that the uptake and translocation of Eu in J. effusus (and possibly in other wetland plants) is caused by a short-term decrease of the redox potential in a rhizosphere favoring reduction of Eu3+ to Eu2+ and thus enhancing Eu mobility in the soil-plant environment.
中文翻译：
Jun实枝样中正Eu异常的存在及可能成因。
背景技术稀土元素（REE）是植物的非必需元素。它们以低剂量刺激植物生长，但高剂量时具有植物毒性。在同一植物物种的各个器官中，REE浓度存在差异，但是在不同位置收集的同一物种的样品中，归一化的REE模式可能非常相似。在这里，我们比较了从具有不同土地利用类型的地点收集的纯种（普通草，软草）地上样品中的归一化REE曲线。方法测量了55个芽孢假单胞菌样品中的稀土元素浓度。这些样品是从波兰中南部的圣十字山的15个采样点收集的，并使用电感耦合等离子体质谱法进行了分析。 （ICP-MS）。将结果标准化为北美页岩组合，并计算了不同元素的异常。结果REE总浓度从0.028 mg / kg到2.7 mg / kg不等。样品富含La和Ce浓度最高的轻稀土元素（从La到Eu）。除酸性矿山排水影响地区收集的两个样本外，所有样品中的北美页岩复合材料（NASC）归一化REE曲线大致相似。结论所有样品在NASC归一化REE浓度模式中均显示出正positive异常。对此的最可能解释是，J中Eu的吸收和易位。
更新日期：2019-11-06
中文翻译：
Jun实枝样中正Eu异常的存在及可能成因。
背景技术稀土元素（REE）是植物的非必需元素。它们以低剂量刺激植物生长，但高剂量时具有植物毒性。在同一植物物种的各个器官中，REE浓度存在差异，但是在不同位置收集的同一物种的样品中，归一化的REE模式可能非常相似。在这里，我们比较了从具有不同土地利用类型的地点收集的纯种（普通草，软草）地上样品中的归一化REE曲线。方法测量了55个芽孢假单胞菌样品中的稀土元素浓度。这些样品是从波兰中南部的圣十字山的15个采样点收集的，并使用电感耦合等离子体质谱法进行了分析。 （ICP-MS）。将结果标准化为北美页岩组合，并计算了不同元素的异常。结果REE总浓度从0.028 mg / kg到2.7 mg / kg不等。样品富含La和Ce浓度最高的轻稀土元素（从La到Eu）。除酸性矿山排水影响地区收集的两个样本外，所有样品中的北美页岩复合材料（NASC）归一化REE曲线大致相似。结论所有样品在NASC归一化REE浓度模式中均显示出正positive异常。对此的最可能解释是，J中Eu的吸收和易位。
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