The content of 19 metals (chromium, cobalt, nickel, strontium, arsenic, magnesium, barium, cesium, gallium, rubidium, uranium, vanadium, zinc, lead, copper, cadmium, iron, manganese, and aluminum) in sediment in three ephemeral streams (Nahal Sansana, Nahal Revivim and Nahal Pura) with reservoirs in the Negev Desert is studied herein. The study was done in September 2016. The samples were collected from the surface layer of sediment (up to 10 cm) in the reservoirs and in the channels upstream and downstream of the reservoirs. Silt, which on average, accounted for 72% dominated in the sediment. In the spatial distribution of the particle size, sand and gravel fractions were deposited in the reservoirs. Aluminum, iron, and magnesium accounted for 99% of all analyzed metals. The Principal Component Analysis (PCA) and Hierarchical Cluster Analysis (HCA) showed that sediment in the Negev Desert channel upstream of the reservoirs had similar concentrations of metals. Similarities were also found between the analyzed reservoirs. The bottom sediment in reservoirs had higher concentrations of metals than sediment upstream and downstream of the reservoirs. The comparison of concentrations in upstream and downstream locations did not show any unambiguous trends because metal concentrations downstream from the reservoirs were not always lower than upstream of the reservoirs. The analysis of the sediment enrichment factor (EF) showed the highest value in the reservoirs and the lowest downstream of the reservoirs. The concentrations of most analyzed metals did not indicate the possibility of potential ecological risk (SQG).

三种石中沉积物中19种金属（铬，钴，镍，锶，砷，镁，钡，铯，镓，rub，铀，铀，钒，锌，铅，铜，镉，铁，锰和铝的含量）本文研究了内盖夫沙漠中带有水库的河流（Nahal Sansana，Nahal Revivim和Nahal Pura）。该研究于2016年9月完成。样品是从储层以及储层上下游的沉积物表层（最大10厘米）中收集的。淤泥平均占沉积物中的72％。在颗粒大小的空间分布中，砂砾石部分沉积在储层中。铝，铁和镁占所有分析金属的99％。主成分分析（PCA）和层次聚类分析（HCA）显示，水库上游内盖夫沙漠河道中的沉积物具有相似的金属浓度。在分析的储层之间也发现了相似之处。水库底部的沉积物比水库上游和下游的沉积物具有更高的金属浓度。上游和下游位置的浓度比较没有显示任何明确的趋势，因为储层下游的金属浓度并不总是低于储层上游的浓度。对沉积物富集因子（EF）的分析显示，储层中的值最高，而下游的最低。多数分析金属的浓度并未表明潜在的生态风险（SQG）。