“Calculate MIMS dissolved gas concentrations without getting a headache.”

mimsy is a data analysis package that transforms raw MIMS (Membrane Inlet Mass Spectrometer) signal data into dissolved gas concentration readings (mg, micromole) of N2, O2, and Ar based on gas solubility at temperature, pressure, and salinity. Supports dual-temperature standard calibration for dual-bath MIMS setups. mimsy is designed to be simple and accessible for non-R users.

Click on the Get started tab above to read through the detailed how-to guide.

Crunch data in 5 lines of code or less

# Load data into R
data <- read.csv(file = "data.csv", header = TRUE, stringsAsFactors = FALSE)

# Run the mimsy function
results <- mimsy(data, baromet.press = 977.2, units = "hPa")

# Save the results
mimsy.save(results, file = "results.xlsx") # To Excel file
save(results, file = "results.RData") # To RData file

# Done! :)


mimsy holds no endorsement from the Bay Instruments company. This software is preliminary and subject to revision. By the use of this software, the user assumes their own responsibility for ensuring the accuracy of the program.


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Benson, B. B. & Krause, D. (1984). The concentration and isotopic fractionation of oxygen dissolved in freshwater and seawater in equilibrium with the atmosphere. Limnology and Oceanography, 29(3), 620-632. https://doi.org/10.4319/lo.1984.29.3.0620

Stull, D. R. (1947). Vapor Pressure of Pure Substances. Organic and Inorganic Compounds. Industrial & Engineering Chemistry, 39(4), 517-540. https://doi.org/10.1021/ie50448a022

Hamme, R. C. & Emerson, S. R. (2004). The solubility of neon, nitrogen and argon in distilled water and seawater. Deep-Sea Research I, 51(11), 1517-1528. https://doi.org/10.1016/j.dsr.2004.06.009