黄河包头段颗粒物中轻稀土元素的分布特征

干流表层沉积物和悬浮物中各轻稀土元素的总量、非稳定态及非稳定态之和的横向分布特征,以及稀土元素的配分模式和地球化学特征参数均揭示,来自包头市工业废水的外源轻稀土元素对黄河包头段干流具有一定的迭加作用;柱状沉积物中各轻稀土元素的含量、非稳定态及其非稳定态之和的纵向变化规律则揭示,这种迭加作用呈逐年递减之势,但又由于支流柱状沉积物中非稳定态稀土元素的含量较高,从而仍有对干流产生进一步迭加的潜势。

Distribution Characteristics of LREE in Particulates of the Baotou Section of the Yellow River

The study showed that the change of LREE total content in the suspended matter and surface sediment along the Baotou section of the Yellow River was very similar to that of every unstable speciation content, sum of unstable speciation content and distribution pattern and geochemistry parameters of rare earth elements, which all indicated that obviously pile-effect brought about by the REE industrial wastewater onto REE in the Yellow River mainstream, particularly LREE, but the pile-effect weakened gradually in recent years. The tendency of LREE total content, every unstable speciation content and sum of unstable speciation content was decreasing from bottom to top, which indicated that pile-up of external LREE from industry wastewater was in a fall trend on LREE of the Yellow River mainstream. And speciation and content of REE in the branch still showed that there was potential pile-up of REE, particularly LREE in the mainstream.