Dissolved Fe(II) from the southbound leg of the US GEOTRACES Arctic cruise (HLY1502) on USCGC Healy from August to October 2015

<p>Dissolved Fe(II) concentrations were determined using an automated flow injection analysis system (FeLume II Waterville Analytical) employing a luminol chemiluminescence based detection system as described in King et&nbsp;al. (1995) and Heller et al. (2017).<br /> <br /> From published and ongoing work in the Peru and Chile oxygen minimum zones an optimized methodology for Fe(II) detection by luminol has been described in Croot et al. (2019). This work details some of the challenges and limitations of using luminol for dFe(II) detection. It should be noted that as Fe(II) is a transient redox species with a short half life in oxygenated seawater that is dependent on dissolved oxygen&nbsp;and pH, it is not possible to archive (preserve) samples for later analysis. Intercalibrations for Fe(II) have yet to be conducted in the context of GEOTRACES studies and should be pursued where logistically possible.&nbsp;&nbsp;</p>溶解态Fe(II)浓度采用基于鲁米诺化学发光检测系统的自动流动注射分析系统（FeLume II，Waterville Analytical公司生产）进行测定，测定方法参照King等人（1995）及Heller等人（2017）的研究方案。 基于秘鲁与智利海域氧最低区已发表及正在推进的相关研究，Croot等人（2019）已报道了一套优化后的鲁米诺法检测Fe(II)的实验方法。该研究详述了采用鲁米诺法检测溶解态Fe(II)时所面临的若干挑战与局限性。需要说明的是，Fe(II)属于不稳定的氧化还原活性物种，在含氧海水中半衰期极短，且其半衰期与溶解氧浓度及pH值密切相关，因此无法对样品进行保存（固定）以供后续分析。目前在全球海洋痕量元素研究协作网（GEOTRACES）的研究框架内，尚未开展Fe(II)的相互校准工作，若后勤条件允许，应推进此类校准工作。