Dispersant marker chemistry data associated with water column samples collected in the Gulf of Mexico from May 2010 through July 2012

This report contains dispersant marker water chemistry data, and provides additional context for the posted dataset, including information about the collection, analysis, and organization of the data. This data posting differs from other published datasets relating to the Gulf of Mexico in several respects: It includes data from independent BP studies that have not previously been available to the public. It combines dispersant marker test results from 38 NRDA studies and 11 Response studies into one data file. These data reflect extensive efforts to verify and correct the positional information (i.e., coordinates and depths of each sample collected), where necessary. The focus of this data posting is dispersant marker chemistry data associated with water column samples collected in both federal and state jurisdictional waters in the Gulf of Mexico from May 2010 through July 2012. This data posting is supplemental to the water chemistry data set for petroleum-related compounds in water samples, which was posted separately (data posting reference ID W-01v01). More than 15,000 water samples with associated chemistry analyses, collected at more than 4,300 sampling stations, are included in this posting. These samples were collected during 49 studies, using more than 100 sampling cruises and surveys. These studies can be classified into four general categories: NRDA Cooperative—Studies conducted as part of the NRDA which were agreed to and executed cooperatively by the National Oceanic and Atmospheric Administration (NOAA), U.S. Department of Interior (DOI), and/or other Trustees, and BP. BP NRDA Independent—Studies conducted by BP independently to develop data to support and inform the NRDA. Trustee Independent—Studies conducted by NOAA, DOI, and/or other Trustees independently to develop data to support and inform the NRDA. Response (non-NRDA)—Studies conducted by BP and/or government representatives under the direction of the Unified Area Command and in association with activities performed in response to the DWH accident (the Response). The chemical parameters provided in this data posting include the following dispersant markers: Dipropylene glycol n-butyl ether (DPnB), Glycol ethers, Dioctyl sodium sulfosuccinate (DOSS), 2-Butoxyethanol, Propylene glycol. Dispersant markers are chemicals present in the Corexit dispersant formulations used in response to the Deepwater Horizon accident. Analyses of these chemicals are performed to evaluate the potential presence of Corexit in environmental samples. This dataset includes data associated with natural field samples for whole water and for Payne filter and filtrate pairs (Payne et al. 1999), along with the associated field-collected quality control samples, such as field replicates, equipment blanks, field blanks, and trip blanks. Laboratory duplicate samples are provided, where available. No other laboratory quality control samples (e.g., laboratory blanks and spike samples) are included in this data posting. To verify the quality of these data, data validation, to assess the data’s completeness, correctness, and compliance with applicable analytical method requirements, and data verification, to verify the quality of field sample attributes, were conducted.本报告包含分散剂标记物水化学数据，并为已发布的数据集提供补充背景信息，涵盖数据的采集、分析与整理相关内容。本次数据发布与其他已公开的墨西哥湾相关数据集存在多处差异：其一，纳入了此前从未对公众开放的英国石油公司（BP）独立研究数据；其二，将38项自然资源损害评估（Natural Resource Damage Assessment, NRDA）研究与11项应急响应研究中的分散剂标记物测试结果整合至单个数据文件中。必要情况下，本数据集已通过大量工作对位置信息（即每份采集样本的坐标与深度）进行核实与校正。本次数据发布的核心对象为2010年5月至2012年7月期间，在墨西哥湾联邦与州管辖海域采集的水柱样本相关的分散剂标记物水化学数据。本数据集是另一套独立发布的水样中石油类相关化合物水化学数据集（数据发布参考编号W-01v01）的补充内容。本次发布共包含超过15000份水样的配套化学分析数据，这些样本采自4300余个采样站点，涉及49项研究、100余次采样航次与调查活动。上述研究可划分为四大类别：1. NRDA合作研究：由美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）、美国内政部（U.S. Department of Interior, DOI）及/或其他托管方与BP共同协商并合作开展的NRDA相关研究；2. BP独立NRDA研究：由BP独立开展，用于为NRDA提供数据支撑与参考的研究；3. 托管方独立NRDA研究：由NOAA、DOI及/或其他托管方独立开展，用于为NRDA提供数据支撑与参考的研究；4. 应急响应（非NRDA）研究：由BP及/或政府代表在统一区域指挥部指挥下，针对深水地平线（Deepwater Horizon, DWH）溢油事故开展的应急响应活动相关研究。本次数据发布涵盖的化学参数包括以下分散剂标记物：二丙二醇单丁醚（Dipropylene glycol n-butyl ether, DPnB）、乙二醇醚、二辛基磺基琥珀酸钠（Dioctyl sodium sulfosuccinate, DOSS）、2-丁氧基乙醇、丙二醇。分散剂标记物是深水地平线（Deepwater Horizon, DWH）事故应急处置中使用的Corexit分散剂配方中含有的化学物质，对其开展分析可用于评估环境样本中Corexit的潜在存在情况。本数据集包含野外天然样本数据，涵盖全水样、佩恩滤膜与滤液配对样本（Payne et al. 1999），以及配套的野外采集质量控制样本，例如野外平行样、设备空白样、野外空白样与航程空白样。若可获取，本数据集还包含实验室平行样数据。本次发布未纳入其他实验室质量控制样本（如实验室空白样与加标样本）。为验证本数据集的质量，研究团队开展了数据验证工作，以评估数据的完整性、准确性及与适用分析方法要求的符合性；同时开展了数据核查工作，以核实野外样本属性的质量。