Annual variations in composition of the North Dvina River water

New data on elemental composition of particulate matter from the North Dvina River are presented. In May (period of snowmelt flood) it is similar to the upper layer of the...本研究呈现了北德维纳河（North Dvina River）颗粒物元素组成的全新数据。在5月（融雪洪水期），其组成与……的上层物质相似。