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A new sediment profile imaging (SPI) instrument, CHEM-SPI, was developed for in situ two-dimensional measurements of biogeochemical solutes using fluorosensor foils in sediments and overlying waters. The CHEM-SPI system was used to simultaneously measure vertical sections of pH, O2, and pCO2 distributions in subtidal, surface deposits of Long Island Sound, NY. Images are readily obtained in 5–15 min...
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