INVESTIGATION OF INLAND POLLUTION USING TOTAL CARBON (TC), TOTAL ORGANIC CARBON (TOC), INORGANIC CARBON (IC), TOTAL NITROGEN (TN) AND TOC/TN RATIOS

The authors of the study attempted to determine the fraction of selected impurities in the filter backwash water from the pool circuit (hot tub). Ultrafiltration membranes were used for the separation process. The main parameter informing about the content of impurities in a given fraction was total carbon (including the total organic carbon). In the studies, fractions with the following sizes of > 200 kDa, 50–200 kDa, < 50 kDa were separated. The fraction distribution in > 5 kDa and < 5kDa was also analyzed. The percentage content of inorganic carbon and total organic carbon changed depending on the ultrafiltration membrane with different distribution characteristics. The concentration of total organic carbon decreased gradually with a decrease in the MWCO value of the membrane. On the basis of the total carbon value, it was found that the tested washings contained: 30.40 wt.% of > 200 kDa fraction, 55.62 wt.% of fraction in the range of 50–200 kDa and 13.98 wt.% of fraction < 50kDa.

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CARBON CONTENTS AND MODELLING OF TOTAL ORGANIC CARBON FOR Pinus taeda L. FROM NATURAL REGENERATION

Revista Árvore ◽

10.1590/0100-67622016000400009 ◽

2016 ◽

Vol 40 (4) ◽

pp. 661-668 ◽

Cited By ~ 1

Author(s):

Rafael Cubas ◽

Emanuel Arnoni Costa ◽

Viviane Zaniz

Keyword(s):

Organic Carbon ◽

Total Organic Carbon ◽

Pinus Taeda ◽

Natural Regeneration ◽

Ground Level ◽

Total Carbon ◽

Forest Understory ◽

Planted Forest ◽

Pinus Taeda L ◽

Selection Of

ABSTRACT This study aimed to quantify total carbon and its compartments: roots, stems, branches, and aciculas, in order to select an estimated equation of the total organic carbon for Pinus taeda L. settled from natural regeneration in the forest understory of a planted forest in the municipality of Três Barras, SC. Data have been collected from a random selection of 96 individuals with diameter at 0.3 meters above ground level, varying from 2.5 to 19cm. The selected individuals had their dimensional variables (dendrometric and morphometric variables) measured being subsequently felled and their compartments separated, weighed and samples were collected and taken to analysis of carbon contents. Eight traditional models were tested, six arithmetic and two logarithmic, as well as a model developed by the Stepwise process, being total organic carbon the dependent variable, and dimensional variables the independent variables. The total organic carbon found was 46.7% on average, and Tukey-Kramer test indicated significant differences of carbon contents amongst compartments. In comparison with traditional equations tested, the equation adjusted by Stepwise seemed more accurate, with good fit (R2aj. = 0.931) and precision (Syx% = 18.5).

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Determination of total carbon and total organic carbon from volatile air pollutants

Microchimica Acta ◽

10.1007/bf01197402 ◽

1979 ◽

Vol 71 (5-6) ◽

pp. 317-329 ◽

Cited By ~ 4

Author(s):

Edmund Kozlowski ◽

Jacek Namieśnik

Keyword(s):

Organic Carbon ◽

Total Organic Carbon ◽

Air Pollutants ◽

Total Carbon

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One-step Oxidation of Total Organic Carbon, Total Nitrogen, and Total Phosphorous using Wet Chemical Oxidation

Journal of Korean Society of Environmental Engineers ◽

10.4491/ksee.2020.42.12.603 ◽

2020 ◽

Vol 42 (12) ◽

pp. 603-609

Author(s):

Jeong-Hwan Choi ◽

Dong-Hun Shin ◽

Hye-Bin Kim ◽

Jong-Gook Kim ◽

Kitae Baek

Keyword(s):

Organic Carbon ◽

Total Organic Carbon ◽

Total Nitrogen ◽

Uv Irradiation ◽

Oxidation Process ◽

Irradiation Time ◽

Suitable Condition ◽

Chemical Oxidation ◽

Total Phosphorous ◽

Wet Chemical

Objective:This study proposed the simultaneous multi-oxidation of total organic carbon, total nitrogen, and total phosphorous using modified wet chemical oxidation method.Methods:The multi oxidation process was based on the dual radical system with sulfate and hydroxyl radicals. The sodium persulfate (Na2S2O8) and sodium hydroxide (NaOH) were activated at 40℃ and UV irradiation with 254 nm to generate the sulfate radical and hydroxyl radical. The organic matters were oxidized by the dual radicals, and TOC, TN, and TP values were compared with the control group.Results and Discussion:The dual radical system oxidized organic carbon to carbon dioxide effectively, and the TOC values were similar to the value obtained from the high-temperature combustion technique. However, the residual persulfate after oxidation process interfered the absorbance for TN and inhibit the complexation in TP measurement. The residual persulfate was effectively converted to sulfate by longer heating and UV irradiation, and the interferences were more sensitive to reaction temperature than UV irradiation time. As a result, a higher temperature condition was more effective and enhanced the applicability of multi-oxidation.Conclusions:The multi oxidation of TOC, TN, and TP was demonstrated by wet chemical oxidation, and the proposed method is expected to secure the sample and reduce the analytic time. However, the more suitable condition to enhance the accuracy of TOC, TN, and TP in the multi-oxidation system should be studied further.

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Direct TOC Quantification in unconventional Kerogen-rich Shale Resource Play from Elemental Spectroscopy Measurements: A Case Study from North Kuwait

10.2118/spe-172975-ms ◽

2015 ◽

Author(s):

Girija K. Joshi ◽

Mihira N. Acharya ◽

Marie Van Steene ◽

Sandeep Chakravorty ◽

Christophe Darous ◽

...

Keyword(s):

Organic Carbon ◽

Total Organic Carbon ◽

Gamma Ray ◽

Horizontal Wells ◽

Final Analysis ◽

Total Carbon ◽

Empirical Estimation ◽

New Type ◽

Borehole Image ◽

Borehole Image Logs

Abstract The deep organic-rich calcareous Kerogen of North Kuwait, a continuous 50ft thinly alternating carbonate – organic-rich argillaceous sequence, is not only a source rock but has gained importance as potential reservoirs themselves of typical unconventional category. Resource play or Kerogen characterization relies on quantifying total organic carbon (TOC) and estimating accurate mineralogy. This paper describes the first attempt to directly measure total organic carbon of the Limestone-Kerogen sequence. For the present study, empirical estimations of TOC have been carried out based on conventional log measurements and nuclear magnetic resonance (NMR). The introduction of a new neutron-induced capture and inelastic gamma ray spectroscopy tool using a very high-resolution scintillator and a new type of pulsed neutron generator for the deep unconventional kerogen resources have provided a unique opportunity to measure a stand-alone quantitative TOC value using a combination of capture and inelastic gamma ray spectra. In this process, Inorganic Carbon Content (ICC) is estimated by using elemental concentrations measured by this logging tool in addition to measuring Total Carbon, and this value is subtracted from the measured total carbon to give TOC. The advanced elemental spectroscopy tool measurements were first used to determine accurately the complex mineralogy of the layered carbonate and organic-rich shale sequence. Extensive laboratory measurements of core / cuttings data were used to calibrate the petrophysical evaluation and capture the heterogeneity seen on borehole image logs. The final analysis shows considerable improvements compared to conventional empirical estimation. Once the mineralogy is properly determined, the log-derived TOC matches very well with core measured TOC. This technique has provided a new direct and accurate log-derived TOC for Kerogen characterization. The application has a potential to be used for CAPEX optimization of the coring in future wells. This technique can also be applied in HPHT and High-angle horizontal wells, which can overcome challenging coring difficulties in horizontal wells.

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