Cation Data for the East River Watershed, Colorado

This data package contains mean values for cation concentration for water samples taken from the East River Watershed in Colorado. Inductively coupled plasma mass spectrometry (ICP-MS) has been used to measure the concentrations of 37 elements of interest simultaneously for the East River Watershed, Colorado groundwater and surface water samples to inform insights on the biogeochemistry processes within the watershed. The East River is part of the Watershed Function Scientific Focus Area (WFSFA) located in the Upper Colorado River Basin, United States. Inductively coupled plasma mass spectrometry (ICP-MS) has been used to measure the concentrations of 37 elements of interest simultaneously for Rifle and East River Watershed, Colorado groundwater and surface water samples. The instrumentation, Elan DRC II, PerkinElmer SCIEX, automatically switches among the three models necessary to analyze all 37 elements. These 37 elements include: (1) Lithium (Li), Beryllium (Be), Boron (B), Soldium (Na), Magnesium (Mg), Aluminium (Al), Silicon (Si), Phosphorus (P), Titanium (Ti), Cobalt (Co), Nickel (Ni), Copper (Cu), Zinc (Zn), Germanium (Ge), Arsenic (As), Rubidium (Rb), Strontium (Sr), Zirconium (Zr), Molybdenum (Mo), Silver (Ag), Cadmium (Cd), Tin (Sn), Antimony (Sb), Caesium (Cs), Barium (Ba), Europium (Eu), Lead (Pb), Thorium (Th), Uranium (U) using santadard model, argon Ar as reaction gas, (2) Potassium (K), Calcium (Ca), Vanadium (V), Chromium (Cr), Manganese (Mn), Iron (Fe) using dynamic reaction cell (DRC) model, ammonia NH3 as reaction gas, and (3) Phosphorus (P) and Selenium (Se) using DRC model, oxygen O2 as reaction gas. Note for the samples with higher concentrations of chloride (Cl-), asenic (As) concentrations were analysed with DRC model (oxygen O2 as reaction gas) to avoid the interference of chloride. All samples were prepared/diluted with 2% (v/v) ultrapure nitric acid in Milli-Q water (18.2 mega ohm-cm), and analyzsed under a rigorous quality assurace and qulity control (QA/QC) process. Each file is named by location and element. The latitude and longitude of each location are given in a file called locations.csv. Update 4/11/2021: Added Detemination of Method Detection Limits (MDLs) for ICP-MS document, which can be accessed as a PDF or with Microsoft Word.

本数据包包含美国科罗拉多州东河流域采集的水样的阳离子浓度均值。为解析该流域内的生物地球化学过程，研究团队采用电感耦合等离子体质谱法（Inductively coupled plasma mass spectrometry, ICP-MS），同时测定了该流域及科罗拉多州里弗尔（Rifle）区域的地下水与地表水样品中37种目标元素的浓度。东河隶属于美国科罗拉多河上游流域的流域功能科学聚焦区（Watershed Function Scientific Focus Area, WFSFA）。所用仪器为珀金埃尔默SCIEX公司的Elan DRC II，可自动切换三种分析模式以完成全部37种元素的检测。该37种元素分为三类：(1) 采用标准模式、以氩气（Ar）为反应气，检测元素包括：锂（Li）、铍（Be）、硼（B）、钠（Na）、镁（Mg）、铝（Al）、硅（Si）、磷（P）、钛（Ti）、钴（Co）、镍（Ni）、铜（Cu）、锌（Zn）、锗（Ge）、砷（As）、铷（Rb）、锶（Sr）、锆（Zr）、钼（Mo）、银（Ag）、镉（Cd）、锡（Sn）、锑（Sb）、铯（Cs）、钡（Ba）、铕（Eu）、铅（Pb）、钍（Th）、铀（U）；(2) 采用动态反应池（Dynamic Reaction Cell, DRC）模式、以氨气（NH3）为反应气，检测元素包括：钾（K）、钙（Ca）、钒（V）、铬（Cr）、锰（Mn）、铁（Fe）；(3) 采用DRC模式、以氧气（O2）为反应气，检测元素包括：磷（P）与硒（Se）。注：对于氯离子（Cl⁻）浓度较高的样品，采用DRC模式（以氧气O2为反应气）分析砷（As）浓度，以规避氯离子的质谱干扰。所有样品均采用2%（体积比）超纯硝酸于电阻率18.2兆欧·厘米的密理博（Milli-Q）超纯水体系中进行制备与稀释，并通过严格的质量保证与质量控制（QA/QC）流程完成分析。所有数据文件均以采样点位与元素名称命名，各采样点位的经纬度信息存储于名为locations.csv的文件中。2021年4月11日更新：新增ICP-MS方法检出限（Method Detection Limits, MDLs）测定文档，可通过PDF或Microsoft Word格式获取。