Deep-Sea DuraFET: A Pressure Tolerant pH Sensor Designed for Global Sensor Networks

Analytical Chemistry
Kenneth S JohnsonJames G Connery

Abstract

Increasing atmospheric carbon dioxide is driving a long-term decrease in ocean pH which is superimposed on daily to seasonal variability. These changes impact ecosystem processes, and they serve as a record of ecosystem metabolism. However, the temporal variability in pH is observed at only a few locations in the ocean because a ship is required to support pH observations of sufficient precision and accuracy. This paper describes a pressure tolerant Ion Sensitive Field Effect Transistor pH sensor that is based on the Honeywell Durafet ISFET die. When combined with a AgCl pseudoreference sensor that is immersed directly in seawater, the system is capable of operating for years at a time on platforms that cycle from depths of several km to the surface. The paper also describes the calibration scheme developed to allow calibrated pH measurements to be derived from the activity of HCl reported by the sensor system over the range of ocean pressure and temperature. Deployments on vertical profiling platforms enable self-calibration in deep waters where pH values are stable. Measurements with the sensor indicate that it is capable of reporting pH with an accuracy of 0.01 or better on the total proton scale and a precision over multiye...Continue Reading

References

Apr 26, 2003·Analytical Chemistry·Todd R MartzMichael D DeGrandpre
Jan 26, 2007·Chemical Reviews·Kenneth S JohnsonWilliam J Showers
Feb 16, 2007·Chemical Reviews·Frank J Millero
Aug 12, 2009·Proceedings of the National Academy of Sciences of the United States of America·John E DoreDavid M Karl
Dec 30, 2011·PloS One·Gretchen E HofmannTodd R Martz
Apr 9, 2015·Environmental Science. Processes & Impacts·Nadezda PankratovaEric Bakker
Jul 29, 2015·Proceedings of the National Academy of Sciences of the United States of America·Aida F RíosFiz F Pérez

❮ Previous
Next ❯

Citations

Sep 14, 2016·Annual Review of Marine Science·Galen A McKinleyDarren J Pilcher
Aug 23, 2019·Annual Review of Marine Science·Hervé ClaustreYuichiro Takeshita
Aug 14, 2019·Current Climate Change Reports·Seth M BushinskyNancy L Williams
Dec 11, 2020·Lab on a Chip·Tatsuhiro Fukuba, Teruo Fujii
Jun 10, 2020·Environmental Science & Technology·Marta ÁlvarezAkihiko Murata

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.