Per- and Polyfluoroalkyl Substance Concentrations, Age Estimates, Redox Categories, and Related Data for Groundwater from the Great Miami Buried-Valley Aquifer, Southwestern Ohio, 2019–20

This data release presents results of chemical analyses of groundwater sampled during summer and autumn of 2019 and spring of 2020 from 23 wells in the Great Miami buried-valley aquifer (GM-BVA) of southwestern Ohio. Groundwater and quality-control samples were analyzed to determine concentrations of selected per- and polyfluoroalkyl substances (PFAS). Groundwater and related quality-control samples were collected from 22 of 23 wells and analyzed for 24 different PFAS by two different laboratories that used slightly different proprietary isotope-dilution based adaptations of U.S. Environmental Protection Agency (USEPA) method 537.1, referred to as method 1 and method 2. Results from PFAS analysis of groundwater samples and quality-control samples, including sequential replicate samples and field blanks are presented in this data release. Reporting and detection limits for analyses of individual PFAS and recovery data for isotopically labeled surrogate compounds added to each sample by the analyzing laboratory, are also included in the data release. The GM-BVA is a glacial outwash and alluvial fill aquifer that is the sole source of water supply for much of the region. The study was performed by the U.S. Geological Survey, in cooperation with the Miami Conservancy District, Dayton, Ohio. This data release includes details of the sampled wells, tritium-helium-3 and tritium-based estimates of groundwater age from prior (1999 and 2000) and current (2019-2020) groundwater samples, and redox (reduction/oxidation) classifications and related water-quality constituent concentrations from groundwater samples collected in 1999, 2000, 2019 and 2020 from the same wells sampled by this effort for PFAS. Field groundwater-quality parameters measured from the sampled wells in 1999–2000 and in 2019–2020 groundwater sample collection are also presented.

本数据集发布涵盖2019年夏秋季及2020年春季，从俄亥俄州西南部大迈阿密埋藏谷含水层（Great Miami buried-valley aquifer, GM-BVA）的23口井中采集的地下水样品的化学分析结果。本次研究对地下水及质量控制样品开展分析，以测定选定的全氟和多氟烷基物质（per- and polyfluoroalkyl substances, PFAS）浓度。研究从23口井中的22口采集了地下水及相关质量控制样品，交由两家实验室针对24种不同PFAS开展分析；两家实验室采用了略有差异的专属同位素稀释法改编版美国环境保护署（U.S. Environmental Protection Agency, USEPA）方法537.1，分别记为方法1与方法2。本数据集包含地下水样品与质量控制样品（包括连续平行样品及现场空白样）的PFAS分析结果，同时收录各PFAS分析的报告限与检出限，以及分析实验室向每份样品添加的同位素标记替代化合物的回收率数据。大迈阿密埋藏谷含水层为冰川冰水沉积与冲积充填含水层，是该区域大部分地区的唯一供水水源。本研究由美国地质调查局（U.S. Geological Survey）与俄亥俄州代顿市迈阿密保护区（Miami Conservancy District）合作开展。本数据集还包含本次PFAS采样所用同批次井的相关细节：包括基于1999、2000年及本次（2019-2020年）地下水样品的氚-氦3法与氚法地下水年龄估算结果，以及1999、2000、2019及2020年采集的这些井的地下水样品的氧化还原（redox）分类与相关水质组分浓度数据。此外还收录了1999-2000年及2019-2020年地下水采样期间，在各采样井现场测定的地下水水质参数。