Data sets of water chemistry in Shiyang river basin
Description
From May 2014 to Oct 2018, representative reservoirs were selected for monitoring in the mountainous area (NY Reservoir), the oasis (HYS Reservoir), and desert (QTH reservoir)(Table 1) Five reservoir water sampling points were established in each reservoir to collect reservoir water, and the sampling points were distributed at reservoir inlets, reservoirs, and reservoir outlets. To ensure the representative of the samples and avoid the influence of extreme climate eventspecial weather, the sampling was always carried out under sunny and windless conditions. Once a month, aAt least three water samples were collected from each reservoir once a month. A total of 513 valid samples were obtained (Three of the sampling points are close to the dam, one sampling point is in the center of the lake, and the sample is taken 10cm below the water surface).
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During the sampling process, the deviation of conductivity (EC)measured by MP522 conductivity meter was≤±0.2%, while acidity (pH) measured by DDS307 acidity meter was≤±0.1%. The deviation of salinity SAL measured by PAL-SALT Salinity meter was ≤±0.5%, while measured by a DGB-401water quality analysis instrument was ≤±0.05%. All samples were transported to the Chinese Academy of Sciences, Northwest Institute of Eco-Resources and Environment, The main cations (Ca2+, Mg2+, Na+, and K+) were detected by Dionex-600 ion chromatography with a deviation of ≤±5%. The main anions (Cl-, NO- 3 and SO2- 4) were detected by Dionex-3000 ion chromatography with a deviation of ≤±5%, and an accuracy reaching the ng.g-1 level.