Dissolved concentrations of major elements and water isotopes for water samples from the Rio Bermejo mainstem, tributaries, spring-fed channels, and groundwater wells@en

Water samples were filtered to 0.2 micron prior to measurement. Samples for cation analysis were acidified in the field to pH < 2 using 6N HNO3. Cation concentrations were measured with a Varian 720 inductively coupled plasma optical emission spectrometer (ICP-OES) at the GFZ Helmholtz Laboratory for the Geochemistry of the Earth Surface (HELGES), using SLRS-5 (Saint-Laurent River Surface, National Research Council - Conseil National de Recherches Canada) and USGS M212 and USGS T187 as external standards. We corrected for instrument drift by measuring an internal standard (GFZ-RW1) every 10 samples and we determined measurement uncertainty using calibration curve uncertainty. Anion concentrations were measured with a Dionex ICS1100 Ion Chromatograph, using USGS standards M206 and M212 as external standards for quality control, with uncertainty determined from triplicate analysis. We corrected cation concentrations for cyclic salt inputs following Bickle et al. (2005, doi:10.1016/j.gca.2004.11.019).水样在测定前经0.2微米滤膜过滤。用于阳离子分析的样品在野外采用6N硝酸酸化至pH<2。阳离子浓度的测定采用瓦里安720型电感耦合等离子体光发射光谱仪（ICP-OES），于亥姆霍兹地球表层地球化学实验室（GFZ Helmholtz Laboratory for the Geochemistry of the Earth Surface，HELGES）开展，外标选用SLRS-5（加拿大国家研究委员会圣劳伦斯河地表水标准物质）、美国地质调查局（USGS）M212与T187标准物质。本研究每间隔10个样品测定一次内标（GFZ-RW1）以校正仪器漂移，并通过校准曲线不确定度计算测定不确定度。阴离子浓度采用戴安ICS1100型离子色谱仪测定，以USGS M206与M212标准物质作为外标开展质量控制，测定不确定度通过三份平行样品的分析结果确定。参照Bickle等人（2005年，DOI:10.1016/j.gca.2004.11.019）提出的方法，对阳离子浓度进行循环盐输入校正。