All DOC and total dissolved nitrogen concentrations were measured at the Northeast Science Station in Cherskiy through high‐temperature combustion using a Shimadzu TOC‐V organic carbon analyzer linked to a nitrogen chemiluminescence detection unit (TNM‐1). For further method details see Mann et al. (2012 ).
Toc 5 organic carbon analyzer
Manufactured by Shimadzu
Sourced in China
The TOC-V organic carbon analyzer is a laboratory instrument designed to measure the total organic carbon content in water samples. It serves as a tool for accurately quantifying the organic carbon levels in various aqueous matrices.
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Lab products found in correlation
4 protocols using toc 5 organic carbon analyzer
1
Nitrogen Concentration Analysis
2
Analytical Methods for Water Characterization
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The concentration of DDC was determined by a UV-vis spectroscopic method since the DDC had a maximum absorption peak at 256 nm. The absorbance of aqueous samples was recorded at 256 nm by a UV–vis spectrophotometer (UV–5500PC, Shanghai Metash Instruments Co. Ltd, China). The TOC was measured using a Shimadzu TOC–V organic carbon analyzer.
The SO42− concentration was analyzed by a barium chromate spectrophotometry method (HJ/T 342–2007). The NO3− concentration was determined by using an ion chromatograph (Metrohm 792 Basic, Switzerland). Anionic species were separated by a Star-Ion A300 anionic column using a carbonate eluting phase consisted of 2.4 mmol L−1 NaHCO3 and 2.5 mmol L−1 Na2CO3 at flow rate of 1 mL min−1.
The SO42− concentration was analyzed by a barium chromate spectrophotometry method (HJ/T 342–2007). The NO3− concentration was determined by using an ion chromatograph (Metrohm 792 Basic, Switzerland). Anionic species were separated by a Star-Ion A300 anionic column using a carbonate eluting phase consisted of 2.4 mmol L−1 NaHCO3 and 2.5 mmol L−1 Na2CO3 at flow rate of 1 mL min−1.
3
Determination of Thiol Collector Concentration
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The concentration of thiol collectors (PEX, SDD, IET and DDA) was determined by a UV–vis spectroscopic method [10 (link),11 (link),13 (link),30 (link)]. The absorbance of collector solution was recorded by a UV–vis spectrophotometer (UV-5500PC, Shanghai Metash Instruments Co. Ltd, China). The COD was determined by the standard dichromate method (HJ/T 399-2007). The TOC of water samples was measured by using a Shimadzu TOC-V organic carbon analyzer. The carbon mineralization extent (γc) of the collector (PEX, SDD, IET and DDA) was calculated as the below equation where TOC0 and TOCt (mg l−1) were the TOC concentration at initial and time t, respectively.
4
ETC Collector Analysis by UV-Vis, TOC, and GC-MS
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The concentration of ETC collector was determined by a UV-vis spectroscopic method (UV-5500PC, Shanghai Metash Instruments Co. Ltd, China).35 (link) The total organic carbon (TOC) of treated ETC solution was measured using a Shimadzu TOC-V organic carbon analyzer. The concentration of SO42− ions was analyzed by a barium chromate spectrophotometry method (HJ/T 342-2007). The degradation byproducts of ETC collector were identified by the SPE/GC-MS. The byproducts were extracted via the solid phase extraction (SPE) procedures. The SPE extracts were analyzed by the GC-MS (Shimadzu, GCMS-QP2010 SE, Japan), equipped with a capillary column (Zebron ZB-FFAP, 30 m × 0.32 mm × 0.25 μm, Phenomenex, U.S.).
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