Lake Onego water chemical composition based on seasonal field surveys in 2019-2021

The Dataset contains the characteristics of the water chemical composition of Lake Onego (35 stations in different regions of the lake) including the lake outflow Svir' River and the estuarine area of the main tributaries of the lake (rivers Shuya, Vodla, Andoma, and Vytegra). The data were obtained in autumn 2019, spring and summer 2020, and in winter 2021. Detailed information is provided for each station of water sampling (station index, their geographic coordinates, sampling date, sampling depth, temperature, and water chemical composition). The concentration of Na+ and Cl- ions, content of organic matter (TOC, CODMn, CODCr, water color, BOD5), nutrients (PO4-P, TP, NH4-N, NO2-N, NO3-N, TN), Fe, Mn, heavy metals (Cu, Ni, Cr, Zn, Cd, Pb), total suspended solids (TSS), conductivity, and pH were measured in water samples. Analytical methods commonly accepted in hydrochemical practice were used to determine chemical parameters of the water. The hydrochemical data will enable society to understand the water quality of Lake Onego as it is the main source of freshwater. Therefore, this data can be used for comparative analysis of the hydrochemical characteristics of other large lakes.

本数据集涵盖奥涅加湖（Lake Onego）全湖不同区域的35个采样站点的水化学组成特征，同时包含该湖出水口斯维尔河（Svir' River）以及其主要支流（舒亚河、沃德拉河、安多马河与维捷格拉河）的河口区域的相关数据。数据采集时间为2019年秋季、2020年春夏季及2021年冬季。每个采样站点均提供详细信息，包括站点编号、地理坐标、采样日期、采样深度、水温及水化学组成。本次检测的水样指标涵盖：钠离子（Na+）与氯离子（Cl-）浓度、有机质类参数（总有机碳（TOC）、高锰酸盐指数（CODMn）、重铬酸盐指数（CODCr）、水色、五日生化需氧量（BOD5））、营养盐类（正磷酸盐磷（PO4-P）、总磷（TP）、氨氮（NH4-N）、亚硝酸盐氮（NO2-N）、硝酸盐氮（NO3-N）、总氮（TN））、铁（Fe）、锰（Mn）、重金属（铜（Cu）、镍（Ni）、铬（Cr）、锌（Zn）、镉（Cd）、铅（Pb））、总悬浮颗粒物（TSS）、电导率及pH值。本次研究采用水化学实践中通用的标准分析方法测定各项水质化学参数。奥涅加湖作为核心淡水水源，本次水文化学数据可助力社会公众全面认知该湖水质状况；同时，该数据集亦可用于其他大型湖泊的水文化学特征对比分析。