Unlocking the secrets of the Antartic with the aid of ultrapure water

Significance of the Topic

The Antarctic represents one of Earth’s last largely untouched environments, offering critical insight into past and present climate dynamics. Ultra-trace analysis of ice cores, snow, sediments, aerosols and ocean water enables reconstruction of atmospheric composition and pollutant transport over thousands of years. Reliable contamination control is essential for interpreting baseline levels and detecting subtle environmental changes.

Objectives and Study Overview

The CNR Institute for the Dynamics of Environmental Processes (CNR-IDPA) and the Department of Environmental Sciences, Informatics and Statistics at Università Ca’ Foscari led a series of Italian National Antarctic Research Programme expeditions. Their goals were to recover ice cores, collect marine, snow and atmospheric aerosol samples and determine concentrations of persistent organic pollutants (POPs), rare earth elements (REEs), trace metals such as mercury, and organic markers like levoglucosan at ultra-trace levels. Over a 30-year period, more than 300 frozen samples were analyzed under rigorously controlled conditions.

Methodology and Instrumentation

Stringent cleaning of sampling bottles employed multi-week protocols using Type I ultrapure water from ELGA LabWater. In Venice, bottles were soaked, repeatedly rinsed with ELGA PURELAB Ultra (including PURELAB Option-Q in a Class 1000 clean room), acid-filled and heat-sealed. On board the research vessel Italica, a PURELAB flex 3 system supplied continuous ultrapure water for on-site cleaning and rinsing under demanding shipboard conditions. Analytical determinations were performed using:

• Inductively Coupled Plasma Sector-Field Mass Spectrometry (ICP-SFMS) with microflow nebulisation and desolvation for REEs and trace metals.
• High Performance Liquid Chromatography/Electrospray Ionization Triple Quadrupole Mass Spectrometry (HPLC-ESI-MS/MS) for organic markers such as levoglucosan.

Key Results and Discussion

Deployment of ultrapure water systems prevented sample contamination, enabling detection limits in the sub-picogram per gram range for mercury and rare earth elements, and picogram-per-milliliter levels for levoglucosan. Ice core records revealed natural background levels and biomass burning signatures extending back millennia. Ocean and aerosol measurements highlighted modern changes in pollutant distribution. Continuous quality control using standards and blanks ensured data integrity.

Benefits and Practical Applications

Reliable ultrapure water supply underpins high-precision analytical workflows in environmental chemistry, guaranteeing that detected analytes originate exclusively from sampled matrices. This methodology supports climate reconstructions, pollution monitoring and assessment of long-term environmental trends. The workflow can be adopted by QA/QC laboratories, research institutions and field campaigns in other remote or sensitive regions.

Future Trends and Opportunities

Advancements may include integration of portable ultrapure water systems with autonomous sampling platforms (drones or unmanned vessels), real-time monitoring of multiple analytes, and coupling with machine learning algorithms for data interpretation. Further improvements in purification technology will enhance throughput and reduce maintenance for field deployments.

Conclusion

The collaboration between CNR-IDPA and ELGA LabWater demonstrates that ultrapure water systems are indispensable for ultra-trace environmental analysis in Antarctica. Ensuring contamination-free sampling and handling is critical to uncovering subtle chemical signatures that inform our understanding of global climate evolution and pollutant dynamics.

References

• Toretta C., Cozzi G., Barbante C., Capodaglio G., Cescon P. Trace element determination in seawater by ICP-SFMS coupled with microflow nebulisation/desolvation system. Anal. Bioanal. Chem., 2004, 380:258–268.
• Planchon F.A.M. et al. Direct determination of mercury at the sub-picogram per gram level in polar snow and ice by ICP-SFMS. J. Anal. At. Spectrom., 2004, 19:823–830.
• Gambaro A., Zangrando R., Gabrielli P., Barbante C., Cescon P. Direct determination of levoglucosan at the picogram per milliliter level in Antarctic ice by HPLC/ESI-MS/MS. Anal. Chem., 2008, 80(5):1649–1655.
• Gabrielli P. et al. Direct determination of rare earth elements at the sub-picogram per gram level in Antarctic ice by ICP-SFMS using a desolvation system. Anal. Chem., 2006, 78:1883–1889.