Dataset: Programmable Flow Injection (pFI) Silicate Underway Data from R/V Investigator IN2023_V04 in the Southern Ocean during June 2023 (pFI-SI-LOV project)

Preliminary and in progressVersion 1 (2024-07-03)Dataset Type:Cruise Results

Principal Investigator, Contact: Maxime Grand (Moss Landing Marine Laboratories)

BCO-DMO Data Manager: Sawyer Newman (Woods Hole Oceanographic Institution)


Project: Collaborative Research: Developing Automated Nutrient and Trace Metal Methodology using Programmable Flow Injection (pFI-SI-LOV)


Abstract

Here we report silicate data (SiOH4) obtained using a programmable Flow Injection (pFI) analyzer connected to the underway seawater system of the RV Investigator during the return transect of the International Nutrient Intercomparison Voyage (INIV). These data were collected in June 2023 at 15-30 min intervals from 52°S, 142°E to 43°S, 147°E in the Australian sector of the Southern Ocean. During this five-day unattended deployment, the pFI instrument operated autonomously for five days, and the...

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Unfiltered seawater samples from the RV Investigator underway lab were aspirated using an auxiliary diaphragm pump (KNF, USA) into a 3 mL sample loop every 15-30 min during the deployment. The stored samples were immediately analyzed for silicate in duplicate using the pFI assay protocol outlined in Hatta et al. (2021). One key modification was adjusting the holding coils’ temperatures to 25ºC instead of the originally specified 50ºC. In tandem with this temperature change, the stop flow time in the flow cell was extended to 60 seconds to ensure the absorbance of the silicomolybdenum blue at 660 nm product reached a steady state. 


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Results

Lebrec, M., & Grand, M. M. (2024). Programmable flow injection: a versatile technique for benchtop and autonomous analysis of phosphate and silicate in seawater. Frontiers in Marine Science, 11. https://doi.org/10.3389/fmars.2024.1354780
Methods

Hatta, M., Ruzicka, J. (Jarda), Measures, C. I., & Davis, M. (2021). Programmable flow injection in batch mode: Determination of nutrients in sea water by using a single, salinity independent calibration line, obtained with standards prepared in distilled water. Talanta, 232, 122354. https://doi.org/10.1016/j.talanta.2021.122354
Methods

Truesdale, V. W., & Smith, C. J. (1976). The automatic determination of silicate dissolved in natural fresh water by means of procedures involving the use of either α- or β-molybdosilicic acid. The Analyst, 101(1198), 19. https://doi.org/10.1039/an9760100019