Measuring Protons with Photons: A Hand-Held, Spectrophotometric pH Analyzer for Ocean Acidification Research, Community Science and Education
Ocean Acidification (OA) is negatively affecting the physiological processes of marine organisms, altering biogeochemical cycles, and changing chemical equilibria throughout the world’s oceans. It is difficult to measure pH broadly, in large part because accurate pH measurement technology...
| Main Authors: | , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Published: |
Multidisciplinary Digital Publishing Institute
2022
|
| Online Access: | https://hdl.handle.net/1721.1/145994 |
| _version_ | 1811097696282345472 |
|---|---|
| author | Pardis, William Grabb, Kalina C. DeGrandpre, Michael D. Spaulding, Reggie Beck, James Pfeifer, Jonathan A. Long, David M. |
| author2 | Woods Hole Oceanographic Institution |
| author_facet | Woods Hole Oceanographic Institution Pardis, William Grabb, Kalina C. DeGrandpre, Michael D. Spaulding, Reggie Beck, James Pfeifer, Jonathan A. Long, David M. |
| author_sort | Pardis, William |
| collection | MIT |
| description | Ocean Acidification (OA) is negatively affecting the physiological processes of marine organisms, altering biogeochemical cycles, and changing chemical equilibria throughout the world’s oceans. It is difficult to measure pH broadly, in large part because accurate pH measurement technology is expensive, bulky, and requires technical training. Here, we present the development and evaluation of a hand-held, affordable, field-durable, and easy-to-use pH instrument, named the pHyter, which is controlled through a smartphone app. We determine the accuracy of pH measurements using the pHyter by comparison with benchtop spectrophotometric seawater pH measurements, measurement of a certified pH standard, and comparison with a proven in situ instrument, the iSAMI-pH. These results show a pHyter pH measurement accuracy of ±0.046 pH or better, which is on par with interlaboratory seawater pH measurement comparison experiments. We also demonstrate the pHyter’s ability to conduct both temporal and spatial studies of coastal ecosystems by presenting data from a coral reef and a bay, in which the pHyter was used from a kayak. These studies showcase the instrument’s portability, applicability, and potential to be used for community science, STEM education, and outreach, with the goal of empowering people around the world to measure pH in their own backyards. |
| first_indexed | 2024-09-23T17:03:27Z |
| format | Article |
| id | mit-1721.1/145994 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T17:03:27Z |
| publishDate | 2022 |
| publisher | Multidisciplinary Digital Publishing Institute |
| record_format | dspace |
| spelling | mit-1721.1/1459942023-06-28T20:32:58Z Measuring Protons with Photons: A Hand-Held, Spectrophotometric pH Analyzer for Ocean Acidification Research, Community Science and Education Pardis, William Grabb, Kalina C. DeGrandpre, Michael D. Spaulding, Reggie Beck, James Pfeifer, Jonathan A. Long, David M. Woods Hole Oceanographic Institution Ocean Acidification (OA) is negatively affecting the physiological processes of marine organisms, altering biogeochemical cycles, and changing chemical equilibria throughout the world’s oceans. It is difficult to measure pH broadly, in large part because accurate pH measurement technology is expensive, bulky, and requires technical training. Here, we present the development and evaluation of a hand-held, affordable, field-durable, and easy-to-use pH instrument, named the pHyter, which is controlled through a smartphone app. We determine the accuracy of pH measurements using the pHyter by comparison with benchtop spectrophotometric seawater pH measurements, measurement of a certified pH standard, and comparison with a proven in situ instrument, the iSAMI-pH. These results show a pHyter pH measurement accuracy of ±0.046 pH or better, which is on par with interlaboratory seawater pH measurement comparison experiments. We also demonstrate the pHyter’s ability to conduct both temporal and spatial studies of coastal ecosystems by presenting data from a coral reef and a bay, in which the pHyter was used from a kayak. These studies showcase the instrument’s portability, applicability, and potential to be used for community science, STEM education, and outreach, with the goal of empowering people around the world to measure pH in their own backyards. 2022-10-26T17:30:06Z 2022-10-26T17:30:06Z 2022-10-18 2022-10-26T11:07:56Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/145994 Sensors 22 (20): 7924 (2022) PUBLISHER_CC http://dx.doi.org/10.3390/s22207924 Creative Commons Attribution https://creativecommons.org/licenses/by/4.0/ application/pdf Multidisciplinary Digital Publishing Institute Multidisciplinary Digital Publishing Institute |
| spellingShingle | Pardis, William Grabb, Kalina C. DeGrandpre, Michael D. Spaulding, Reggie Beck, James Pfeifer, Jonathan A. Long, David M. Measuring Protons with Photons: A Hand-Held, Spectrophotometric pH Analyzer for Ocean Acidification Research, Community Science and Education |
| title | Measuring Protons with Photons: A Hand-Held, Spectrophotometric pH Analyzer for Ocean Acidification Research, Community Science and Education |
| title_full | Measuring Protons with Photons: A Hand-Held, Spectrophotometric pH Analyzer for Ocean Acidification Research, Community Science and Education |
| title_fullStr | Measuring Protons with Photons: A Hand-Held, Spectrophotometric pH Analyzer for Ocean Acidification Research, Community Science and Education |
| title_full_unstemmed | Measuring Protons with Photons: A Hand-Held, Spectrophotometric pH Analyzer for Ocean Acidification Research, Community Science and Education |
| title_short | Measuring Protons with Photons: A Hand-Held, Spectrophotometric pH Analyzer for Ocean Acidification Research, Community Science and Education |
| title_sort | measuring protons with photons a hand held spectrophotometric ph analyzer for ocean acidification research community science and education |
| url | https://hdl.handle.net/1721.1/145994 |
| work_keys_str_mv | AT pardiswilliam measuringprotonswithphotonsahandheldspectrophotometricphanalyzerforoceanacidificationresearchcommunityscienceandeducation AT grabbkalinac measuringprotonswithphotonsahandheldspectrophotometricphanalyzerforoceanacidificationresearchcommunityscienceandeducation AT degrandpremichaeld measuringprotonswithphotonsahandheldspectrophotometricphanalyzerforoceanacidificationresearchcommunityscienceandeducation AT spauldingreggie measuringprotonswithphotonsahandheldspectrophotometricphanalyzerforoceanacidificationresearchcommunityscienceandeducation AT beckjames measuringprotonswithphotonsahandheldspectrophotometricphanalyzerforoceanacidificationresearchcommunityscienceandeducation AT pfeiferjonathana measuringprotonswithphotonsahandheldspectrophotometricphanalyzerforoceanacidificationresearchcommunityscienceandeducation AT longdavidm measuringprotonswithphotonsahandheldspectrophotometricphanalyzerforoceanacidificationresearchcommunityscienceandeducation |