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Table 2

Description of analytical methods, including instrumentation, standardization methods, and precision. DOI: https://doi.org/10.1525/elementa.270.t2

Measurement (lab analyte)LabAnalytical methodaExpected range of resultsReporting limitUncertainty (%)InstrumentationStandardization

 
Nitrate UW MCL Armstrong et al., 1967  0.00–40.00 µM 0.15 µM 10 Technicon Auto Analyzer II 5 point standardization 
Nitrite UW MCL Armstrong et al., 1967  0.00–2.00 µM 0.01 µM 10 Technicon Auto Analyzer II 5 point standardization 
Ammonium UW MCL Slawyk and MacIsaac, 1972  0.00–10.00 µM 0.05 µM 10 Technicon Auto Analyzer II 5 point standardization 
Orthophosphate UW MCL Bernhardt and Wilhelms, 1967  0.00–4.00 µM 0.02 µM 10 Technicon Auto Analyzer II 5 point standardization 
Silicate UW MCL Armstrong et al., 1967  0.00–200.00 µM 0.21 µM 10 Technicon Auto Analyzer II 5 point standardization 
Total Alkalinity PMEL Dickson et al. 2003, 2007 (SOP3b) 1400–2200 µmol kg–1 NAb ±0.1 Custom instrument modeled after those made in Dr. Andrew Dickson’s laboratory at Scripps Institution of Oceanography Analytical uncertainty assessed by periodic analysis of Certified Reference Materials (CRMs) following Dickson et al. (2007) 
Dissolved inorganic carbon PMEL Johnson et al. (1985, 1987, 1993, 1999), Johnson (1992), Dickson et al. 2007 (SOP2) 1300–2200 µmol kg–1 NA ±0.1 UIC, Inc. coulometer coupled with a custom dissloved inorganic carbon extractor Gas loop calibration, CRMs, and replicate sample analysis 
Salinity PMEL Grasshoff et al., 1999  19.0–34.8 0.01 10 Thermosalinograph Routine comparison with in situ CTD measurements showing agreement within ±0.07 
Measurement (lab analyte)LabAnalytical methodaExpected range of resultsReporting limitUncertainty (%)InstrumentationStandardization

 
Nitrate UW MCL Armstrong et al., 1967  0.00–40.00 µM 0.15 µM 10 Technicon Auto Analyzer II 5 point standardization 
Nitrite UW MCL Armstrong et al., 1967  0.00–2.00 µM 0.01 µM 10 Technicon Auto Analyzer II 5 point standardization 
Ammonium UW MCL Slawyk and MacIsaac, 1972  0.00–10.00 µM 0.05 µM 10 Technicon Auto Analyzer II 5 point standardization 
Orthophosphate UW MCL Bernhardt and Wilhelms, 1967  0.00–4.00 µM 0.02 µM 10 Technicon Auto Analyzer II 5 point standardization 
Silicate UW MCL Armstrong et al., 1967  0.00–200.00 µM 0.21 µM 10 Technicon Auto Analyzer II 5 point standardization 
Total Alkalinity PMEL Dickson et al. 2003, 2007 (SOP3b) 1400–2200 µmol kg–1 NAb ±0.1 Custom instrument modeled after those made in Dr. Andrew Dickson’s laboratory at Scripps Institution of Oceanography Analytical uncertainty assessed by periodic analysis of Certified Reference Materials (CRMs) following Dickson et al. (2007) 
Dissolved inorganic carbon PMEL Johnson et al. (1985, 1987, 1993, 1999), Johnson (1992), Dickson et al. 2007 (SOP2) 1300–2200 µmol kg–1 NA ±0.1 UIC, Inc. coulometer coupled with a custom dissloved inorganic carbon extractor Gas loop calibration, CRMs, and replicate sample analysis 
Salinity PMEL Grasshoff et al., 1999  19.0–34.8 0.01 10 Thermosalinograph Routine comparison with in situ CTD measurements showing agreement within ±0.07 

a References cited provide descriptions of methods, custom instruments, and standard operating procedures (SOPs).

b Not available.

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