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• W2070496688 abstract "Automated in-situ instrumentation has been developed for precise and accurate measurements of a variety of analytes in natural waters. In this work we describe the use of 'SEAS' (spectrophotometric elemental analysis system) instrumentation for measurements of solution pH. SEAS-pH incorporates a CCD-based spectrophotometer, an incandescent light source, and dual pumps for mixing natural water samples with a sulfonephthalein indicator. The SEAS-pH optical cell consists of either a liquid core waveguide (LCW, Teflon AF-2400) or a custom-made PEEK cell. Long optical path lengths allow use of indicators at low concentrations, thereby precluding large indicator-induced pH perturbations. Laboratory experiments show that pH measurements obtained using LCW and PEEK optical cells are indistinguishable from measurements obtained using conventional spectrophotometric cells and high-performance spectrophotometers. Deployments in the Equatorial Pacific and the Gulf of Mexico demonstrate that SEAS-pH instruments are capable of obtaining vertical pH profiles with high spatial resolution. SEAS-pH deployments at a fixed river-site (Hillsborough River, FL) demonstrate the capability of SEAS for observations of diel pH cycles with high temporal resolution. The in-situ precision of SEAS-pH is assessed as 0.0014 pH units, and the system's measurement frequency is approximately 0.5 Hz. This work indicates that in-situ instrumentation can be used to provide accurate, precise, and highly resolved observations of carbon-system transformations in the natural environment." @default.
• W2070496688 created "2016-06-24" @default.
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• W2070496688 date "2006-07-13" @default.
• W2070496688 modified "2023-10-01" @default.
• W2070496688 title "Spectrophotometric Measurements of pH in-Situ: Laboratory and Field Evaluations of Instrumental Performance" @default.
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• W2070496688 doi "https://doi.org/10.1021/es0601843" @default.
• W2070496688 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16955904" @default.
• W2070496688 hasPublicationYear "2006" @default.
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