Chemical properties of marine sediments sampled during the Thala Valley Long Term Monitoring (TV-LTM) 2014-15 field season

This data set contains chemical parameters determined for marine sediment samples collected in the 2014-15 summer field season as part of the Thala Valley Long term Monitoring (TV-LTM) project. The aim of this project is to examine changes in the marine benthic ecosystem in the vicinity of Casey station following clean-up of the abandoned Thala Valley waste disposal ('tip') site in 2003-04.The chemical parameters are:(1) 1 M hydrochloric acid-extractable elements (mainly metals) by ICP-AES (inductively coupled plasma - atomic emission spectrometry)(2) water-extractable nutrients by FIA (flow injection analysis)(3) petroleum hydrocarbon fractions (TPH: total petroleum hydrocarbons) and persistent organic pollutants (POPs) - polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) - by GC-FID, GC-ECD and GC-MS (gas chromatography - flame ionization detector / electron capture detector / mass spectrometry), respectively(4) Loss on Ignition at 550 degrees Celsius (LOI; as a proxy for Total Organic Matter) and Dry Matter Fraction (DMF) by gravimetric analysis.Data sets 1, 3 and 4 were obtained for composite samples prepared from the 0-5 cm section of 51 marine sediment cores collected by SCUBA divers from impacted (contaminated) and control (pristine) locations around Casey. Data set 2 was obtained for a subsample of the surface section (0-1 cm) of each of 74 marine sediment cores collected during the same sampling campaign.Sample locations:* Brown Bay (BB) - inner, mid and outer sites* Casey Wharf* McGrady Cove* O'Brien Bay (OB) - OB1, OB2, OB3 sites* Shannon Bay* Wilkes (adjacent to abandoned station)Analytical labs involved:* Wild Lab, AAD, Kingston, Tasmania (data sets 1 and 4; sample preparation for data set 2)* Analytical Services Tasmania (AST), New Town, Tasmania (data set 2)* Analytical Services Unit (ASU), Queen's University, Kingston, Ontario, Canada (data set 3)Information concerning analytical data quality (method reporting limits, accuracy and precision), are included with each data set. Complete analytical method details are available in a separate summary document.

本数据集包含2014-2015年夏季野外调查期间采集的海洋沉积物样品的化学参数，该采样工作作为塔拉谷长期监测（Thala Valley Long term Monitoring, TV-LTM）项目的一部分开展。本项目旨在探究2003-2004年废弃塔拉谷废物处置（“堆填区”）场地清理完成后，凯西站周边海洋底栖生态系统的变化情况。
本次测定的化学参数包括：
(1) 采用电感耦合等离子体原子发射光谱法（inductively coupled plasma - atomic emission spectrometry, ICP-AES）测定的1 mol/L盐酸可提取元素（以金属为主）；
(2) 采用流动注射分析法（flow injection analysis, FIA）测定的水浸提营养盐；
(3) 分别采用气相色谱-火焰离子化检测器（gas chromatography - flame ionization detector, GC-FID）、气相色谱-电子捕获检测器（gas chromatography - electron capture detector, GC-ECD）及气相色谱-质谱联用法（gas chromatography - mass spectrometry, GC-MS）测定的石油烃组分[总石油烃（total petroleum hydrocarbons, TPH）]以及持久性有机污染物（persistent organic pollutants, POPs）——多氯联苯（polychlorinated biphenyls, PCBs）和多溴二苯醚（polybrominated diphenyl ethers, PBDEs）；
(4) 采用重量分析法测定的550℃灼烧减重（Loss on Ignition, LOI，作为总有机质的替代指标）及干物质占比（Dry Matter Fraction, DMF）。

数据集1、3和4的样品为51个海洋沉积物岩心0-5cm层位的混合样，这些岩心由水肺潜水员在凯西站周边受污染点位与原始未受干扰的对照点位采集；数据集2的样品为同期采样行动中获取的74个海洋沉积物岩心表层（0-1cm）的子样。

采样点位如下：
* 布朗湾（Brown Bay, BB）：内湾、中湾及外湾点位
* 凯西码头（Casey Wharf）
* 麦格雷迪湾（McGrady Cove）
* 奥布莱恩湾（O'Brien Bay, OB）：OB1、OB2、OB3点位
* 香农湾（Shannon Bay）
* 威尔克斯（Wilkes，毗邻废弃科考站）

参与本次分析的实验室包括：
* 塔斯马尼亚州金斯顿市澳大利亚南极局（Australian Antarctic Division, AAD）野生实验室：负责数据集1和4的分析工作，以及数据集2的样品前处理；
* 塔斯马尼亚州纽敦市塔斯马尼亚分析服务公司（Analytical Services Tasmania, AST）：负责数据集2的分析工作；
* 加拿大安大略省金斯顿市女王大学分析服务部（Analytical Services Unit, ASU）：负责数据集3的分析工作。

各数据集均附带分析数据质量相关信息（包括方法检出限、准确度与精密度）。完整的分析方法细节可查阅单独发布的汇总文档。