Total nitrogen (TN) and total phosphorus (TP) samples were acidified (H2SO4, 0.1% final concentration), then kept at 4°C until concentrations were determined by a colorimetric method after persulfate digestion. Samples for major ions, dissolved organic carbon (DOC) and colored dissolved organic carbon (CDOM) were filtered through Milli-Q water pre-rinsed cellulose acetate filters (0.2 μm pore size, Advantec Micro Filtration Systems), then acidified (for cations only, Trace Metal Grade HNO3 at 0.2% final concentration) and kept at 4°C until analysis. Anion concentrations were measured by ion chromatography (ICS-2000, Dionex), major cations by atomic emission spectroscopy (ICP-AES, Varian Vista AX), and trace cations by mass spectroscopy (ICP-MS, Thermo X Series). DOC was measured by combustion catalytic oxidation (Shimadzu TOC-5000A carbon analyzer calibrated with potassium biphthalate), and CDOM was quantified by absorption at 440 nm measured in a Varian Cary 100 dual beam spectrophotometer (Varian Inc., Canada; Watanabe et al., 2011 (link)). Alkalinity (in calcium carbonate equivalents) was determined with titration by 0.01 M sulfuric acid (Wetzel and Likens, 2000 ), and DIC was calculated from alkalinity and the initial sample pH.
Toc 5000a carbon analyzer
Manufactured by Shimadzu
Sourced in Canada
The TOC-5000A is a carbon analyzer designed to measure the total organic carbon (TOC) content in water samples. It utilizes infrared detection technology to determine the concentration of carbon compounds in the sample. The TOC-5000A provides accurate and reliable measurements for environmental and industrial applications.
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2 protocols using toc 5000a carbon analyzer
1
Comprehensive Water Quality Analysis
2
Soil Organic Carbon Quantification
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Total organic carbon (TOC) in the soils studied was determined using a Rock-Eval 6 apparatus (Vinci Technologies; Espitalié et al. (1985a, b) and Lafargue et al. (1998) ). This instrument uses a ramped temperature pyrolysis technique, where a small amount of material (70 -100 mg) is heated in an inert atmosphere (helium or nitrogen) and combusted with air, to measure several key geochemical parameters, including TOC. Measurements of TOC were performed in samples taken from the potted soils, just before bean sowing, and after drying the soil at 105C° and milling it very finely to obtain homogeneous samples.
Dissolved organic carbon (DOC) was measured in SPW collected with Rhizon samplers. Analyses were performed with a Shimadzu © TOC 5000A carbon analyzer. The accuracy of the instrument was checked by performing calibration with a standard reference solution of potassium hydrogen phthalate (KHP) at a concentration of 1000 mg Carbon/L. Four repeated measurements of DOC were performed for each SPW solution.
Dissolved organic carbon (DOC) was measured in SPW collected with Rhizon samplers. Analyses were performed with a Shimadzu © TOC 5000A carbon analyzer. The accuracy of the instrument was checked by performing calibration with a standard reference solution of potassium hydrogen phthalate (KHP) at a concentration of 1000 mg Carbon/L. Four repeated measurements of DOC were performed for each SPW solution.
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