Logan Tegler

Logan is a postdoctoral researcher in the Hawco Lab, where she spends much of her time running samples on the triple-quadrupole inductively coupled plasma mass spectrometer (TQ-ICP-MS). She's analyzed a wide variety of materials using the ICP-MS, including leached sediment samples, hydrothermal vent sediments, seawater, microbes, and more.

Her specialties in the lab are TQ-ICP-MS and single-cell ICP-MS (sc-ICP-MS), though she's also well-versed in multi-collector (MC)-ICP-MS and enjoys measuring a range of isotopes, including cadmium (Cd), iron (Fe), osmium (Os), and barium (Ba). She also loves going out to sea and working in the trace metal van collecting samples on the R/V Kilo Moana.

Outside of the lab, Logan enjoys reading, acting in the local Honolulu community theatre, and eating delicious treats.

She's passionate about her work in the Hawco Lab and hopes to stay as long as possible, but she is also actively exploring assistant scientist positions in the field of trace metal biogeochemistry. If you have questions or know of any opportunities, feel free to reach out to her at tegler@hawaii.edu

Highlights from the lab

We had our TQ-ICP-MS serviced a few months ago. Take a look inside!

Logan used column chromatography to isolate cadmium from sediment samples in order to investigate whether cadmium isotopes can reveal patterns of past nutrient utilization over time. Read our our study here!

Samples from our seaFAST are ready for analysis! The probe goes into each sample and carries it to the TQ-ICP-MS where the mass to charge ratio is measured.

Developing novel methods

Single-cell ICP-MS

Logan is leading an effort to develop a method to measure intracellular metal concentrations in picoeukaryotes and diatoms by leverging recent advances in single-cell inductively coupled plasma mass spectrometry (ICP-MS). This method utilizes millisecond scanning speeds to enable the measurement of Fe in individual eukaryotic phytoplankton cells. In practice, we collect and preserve phytoplankton sample while at sea, sort into microbial taxa using fluorescence-activated flow cytometry, and analyzed for population-specific intracellular Fe concentrations.

Our work is done in collaboration with Dr. Angel White, whose lab houses an AURORA cell sorter. We are currently focusing on how natural Fe gradients in the South Pacific Ocean shape cellular Fe quotas in picoeukaryotes.

To the right is a cartoon illustrating how the cells are brought from their buffer solution, to the single cell chamber, ionized in a discrete pulse, and measured on the mass spectrometer!

In the news

Shallow Waters Make the Best Carbon Sinks - EosOxygen content and microbial prevalence may not be as influential on carbon sedimentation as previously thought.

From the atmosphere to the abyss: Iron's role in Earth's climate historyA new study published by researchers at the University of Hawai‘i at Mānoa sheds light on the critical role of iron in Earth’s climate history, revealing how its sources in the South Pacific Ocean have shifted over the past 93 million years. This groundbreaking research, based on the analysis of deep-sea sediment cores, provides crucial insights into the interplay between iron, marine life, and atmospheric carbon dioxide levels.

Cruises in the Pacific Ocean

Some sharks followed the R/V Kilo Moana on a 6 week cruise from Hawai'i to Tahiti

Trace metal sediment traps are deployed to collect sinking particles in the South Pacific Ocean

Ready to deploy the trace metal CTD!

Logan's CV

CV_Tegler_Logan_Fall 2025_UHM.pdf

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