Chemical characterization of water, sediments, and fish from Water Conservation Areas and Canals of the Florida Everglades (USA), 2012 to 2019

This dataset includes field and laboratory measurements of surface waters, pore waters, sediment, and fish from Water Conservation Areas and adjacent canals of the Florida Everglades (USA). Water, sediment, and fish samples were collected from Water Conservation Areas 1 (Arthur R. Marshall Loxahatchee National Wildlife Refuge), 2, and 3 and neighboring canals between 2012 and 2019. The sites sampled in Water Conservation Areas 2 and 3 follow hydrologic flow paths. Field measurements reported for surface and pore waters include specific conductance, pH, dissolved oxygen (DO) concentration, and oxidation-reduction potential (ORP). Pore waters were filtered (quartz fiber filter) and measured for major cations, inorganic anions, inorganic sulfide, dissolved organic carbon (DOC) concentration, dissolved organic matter (DOM) ultraviolet and visible light (UV-Vis) absorption and fluorescence, total mercury (HgT), and methylmercury (MeHg) concentrations. Surface water samples were collected and filtered (quartz fiber filter); particulate concentrations of MeHg and HgT were measured, and filtered aliquots were measured for major cations, inorganic anions, inorganic sulfide, DOC concentration, DOM UV-Vis and fluorescence, HgT and MeHg. Sediments were collected by push-core and measured for HgT, MeHg, organic matter content by loss on ignition (LOI), and percent dry weight. Resident mosquitofish (Gambusia holbrooki) were collected and measured for HgT and MeHg.

本数据集涵盖美国佛罗里达大沼泽地（Florida Everglades）水资源保护区及其邻近运河的地表水、孔隙水、沉积物与鱼类的野外原位及实验室测量数据。2012年至2019年间，研究团队从1号水资源保护区（Arthur R. Marshall Loxahatchee National Wildlife Refuge）、2号及3号水资源保护区及其周边运河采集了水、沉积物和鱼类样本。2号与3号水资源保护区的采样点均沿水文流动路径布设。
地表水与孔隙水的野外原位测量指标包括比电导率、pH值、溶解氧（dissolved oxygen, DO）浓度及氧化还原电位（oxidation-reduction potential, ORP）。孔隙水经石英纤维滤膜过滤后，测定了主要阳离子、无机阴离子、无机硫化物、溶解有机碳（dissolved organic carbon, DOC）浓度、溶解有机质（dissolved organic matter, DOM）的紫外-可见光（UV-Vis）吸收与荧光特性，以及总汞（total mercury, HgT）和甲基汞（methylmercury, MeHg）浓度。
地表水样本采集后经石英纤维滤膜过滤：一方面测定了甲基汞与总汞的颗粒态浓度，另一方面对过滤后的滤液测定了主要阳离子、无机阴离子、无机硫化物、DOC浓度、DOM的紫外-可见光吸收与荧光特性，以及总汞和甲基汞含量。
沉积物采用推杆式柱状采样法采集，测定指标包括总汞、甲基汞含量、烧失量（loss on ignition, LOI）表征的有机质占比，以及干重百分比。
研究团队采集了定居性食蚊鱼（Gambusia holbrooki），并测定了其体内的总汞与甲基汞含量。