A Home-Made Automatic Analyzer to Determine the Dissolved Organic Carbon in Seawater

2011 ◽  
Vol 199-200 ◽  
pp. 1819-1822
Author(s):  
Li Ju Tan ◽  
Jiang Tao Wang ◽  
Yue Li
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Inorganic Carbon ◽  
Visual Basic ◽  
Potassium Persulphate ◽  
Temperature Oxidation ◽  
Oxidation Method ◽  
Automatic Analyzer ◽  
Oxidation Efficiency ◽  
The Cost

A home-made automatic analyzer to determine the dissolved organic carbon (DOC) in seawater was introduced in this paper. This analyzer was based on ultraviolet-potassium persulphate oxidation method. The analyzer has 7 parts, including sampling, purging of inorganic carbon, enter sample, oxidation, cooling, apart of gas/liquid and analysis of CO2. The program was compiled by programming language of Visual Basic as the control system. All of the action of the analyzer is auto controlled. Different samples are separated by worked air and Milli-Q water and enter the system using six-way valve. With the catalysis of ultraviolet radiation, the organic matter in samples can be oxidated to CO2quantitatively by K2SO2O8and analyzed by non-dispersive infrared (NDIR) detector latter. The results showed that the oxidation efficiency, as well as the detect limit and the veracity are satisfying. The home-made analyzer was compared with the high temperature oxidation method, and the results showed that the two methods have little difference. The cost of the instrument is cheaper, and need not expensive catalyst, so the DOC in seawater can be analyzed with much lower prices.

scholarly journals Measurement methods of total organic carbon in seawater

2021 ◽  
Vol 233 ◽  
pp. 01078
Author(s):  
Shuwei Zhang ◽  
Zhaoyu Wang ◽  
Xuejiao Yan ◽  
Jing Wang ◽  
Li Zhang ◽  
...  
Keyword(s):  
High Temperature ◽  
Organic Carbon ◽  
Total Organic Carbon ◽  
Water Oxidation ◽  
Combustion Method ◽  
Oxidation Method ◽  
Persulfate Oxidation ◽  
Temperature Combustion ◽  
Oxidation Efficiency ◽  
High Temperature Combustion

Total organic carbon (TOC) can reflect the total amount of organic matter in water. This paper introduces the common methods of measuring organic carbon, including high temperature combustion method, potassium persulfate oxidation method, spectrometry, ozone oxidation chemiluminescence method, supercritical water oxidation method and so on. At present, high temperature combustion method is the most widely used method for TOC measurement in seawater, because of its high oxidation efficiency. TOC sensor needs to be developed to realize in-situ and long-term monitoring.

scholarly journals Quantification of Dissolved Organic Carbon at Very Low Levels in Natural Ice Samples by a UV-Induced Oxidation Method

2011 ◽  
Vol 45 (2) ◽  
pp. 673-678 ◽  
Author(s):  
S. Preunkert ◽  
M. Legrand ◽  
P. Stricker ◽  
S. Bulat ◽  
I. Alekhina ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Oxidation Method ◽  
Low Levels

Enhanced oxidation of MgSO3 during desulfurization by a novel spray method in magnesium-based seawater exhaust gas clean system

2017 ◽  
Vol 231 (4) ◽  
pp. 871-876
Author(s):  
Quan Liu ◽  
Meijun Sun ◽  
Tianliang Zhang ◽  
Yimin Zhu
Keyword(s):  
Oxidation Rate ◽  
Oxidation Mechanism ◽  
Aeration Tank ◽  
Exhaust Gas ◽  
Oxidation Method ◽  
Marine Diesel ◽  
Clean System ◽  
Desulfurization Process ◽  
Oxidation Efficiency ◽  
The Cost

The magnesium-based seawater exhaust gas clean system is effective in reducing sulfur dioxide emission from marine diesel engines. Oxidation of the desulfurization by-product, magnesium sulfite (MgSO3), is required for recycling. However, the oxidation efficiency is generally low in the aeration tank after the desulfurization process, making the tank volume too large for practical use on ocean vessels. In this article, we propose a novel spray oxidation method to enhance the oxidation of MgSO3 during the desulfurization process. The effects of MgSO3 content, pH and temperature on the oxidation rate were investigated. The results showed that the spray oxidation rate of MgSO3 was 1.5 order with respect to the MgSO3 concentration under both unsaturated and saturated conditions of MgSO3 solution, which is different from the aeration oxidation researches. The spray oxidation rate decreased with the increase in pH and raised slowly as the temperature increased. The MgSO3 oxidation mechanism of the spray oxidation method was analyzed and discussed in comparison with the traditional bubble aeration method. The novel spray oxidation method is effective in reducing the cost of the subsequent MgSO3 aeration oxidation process and the offprint of aeration tanks, thus is promising to be applied on ocean vessels.

Analytical methods and application of stable isotopes in dissolved organic carbon and inorganic carbon in groundwater

2015 ◽  
Vol 29 (19) ◽  
pp. 1827-1835 ◽  
Author(s):  
Yinzhu Zhou ◽  
Huaming Guo ◽  
Hai Lu ◽  
Ruoyu Mao ◽  
Hao Zheng ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Analytical Methods ◽  
Inorganic Carbon
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