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TOC Total Organic Carbon Analyzer compares two methods based on the new USP monograph for measuring organic compounds in water used in the pharmaceutical industrytotal organic carbon（TOC）Analyzer - Wet oxidation analyzer and combustion analyzer.
toc analyzerbrief introduction
total organic carbonTotal Organic Carbon, abbreviated asTOC）
TOC analyzerTotal Organic Carbon Analyzer.
A comprehensive indicator that represents the total amount of organic matter in water using carbon content.
TOC can be directly used to represent the total amount of organic matter. Therefore, it is regarded as an important reference indicator for evaluating the degree of organic pollution in water bodies.
toc analyzerThe basic principle is to first oxidize the carbon of organic matter in water into carbon dioxide, eliminate interference factors, and then measure it with a carbon dioxide detector,
Then convert the carbon dioxide gas content into the concentration of organic matter in water through data processing. After continuous research and experimentation, TOC
The detection method has gradually evolved from traditional complex techniques to convenient and accurate.
toc analyzerTOC detection method
1、 Wet process oxidation (persulfate) - nondispersionInfrared Detection (NDIR)
Laboratory type TOC and automatic sampler
This method involves treating the sample with phosphoric acid before oxidation to remove inorganic carbon, and then measuring the concentration of TOC. Modern TOC
In continuous analyzers, the vast majority are wet oxidation processes. Wet oxidation is suitable for complex water bodies such as humic acid and high molecular weight
Insufficient oxidation of compounds, etc., makes it unsuitable for water bodies with high TOC content, but it can be used for conventional water bodies such as surface water
of
2、 High temperaturecatalytic combustionOxidation NondispersionInfrared Detection (NDIR)
The application time of high-temperature catalytic combustion oxidation is much later than that of wet oxidation, but because high-temperature combustion is relatively thorough, it can be applied to pollutants
Heavily polluted rivers, seawater, andindustrial waste waterWaiting for water bodies.
3、 UV Oxidation Non Dispersive Infrared Detection (NDIR)
The method is the same as wet oxidation, but it uses the principle of ultraviolet light (185nm) irradiation before the sample enters the ultraviolet reactor
Previously, removing inorganic carbon resulted in more accurate results. UV oxidation method, suitable for granular organic matter, drugs, proteins, etc
TOC content is not applicable, but it can be used for water bodies such as raw water and industrial water.
4、 UV Wet (Persulfate) Oxidation Non UVdispersionInfrared Detection (NDIR)
This method involves both UV oxidation and wet oxidationSynergistic effectComplement and promote each other,Oxidative degradationThe effect is superior to it
Any method. UV oxidation cannot be used for high TOC water bodies, and the synergy of the two can measure heavily polluted water
Water bodies. Due to its strong applicability and wide measurable range, it has high popularity and mature technology.
5、 Resistance method
This method is a technology that has been applied in recent years. Its principle is to measure the electrical conductivity of the sample before and after ultraviolet oxidation under the premise of temperature compensation
It is achieved by the difference in resistance. But this method has strict requirements for the source of the measured water, and can only be used with relatively clean industrial materials
Water and pure water have a single application direction.
6、 UV method
Ultravioletabsorption spectrumThe detection and analysis of TOC can be traced back to 1972, when Dobbs et al. studied the purple light at 254nm
External absorbance value (A) andUrban sewage treatmentBetween the TOC of secondary effluent and river waterlinear relationshipConducted research. After a few
After ten years of development, due to its advantages of fast, non-contact measurement, good repeatability, and low maintenance, the application of this method has been widely recognized
Rapid development.
7、 Conductivity method
The main component involved in this law is the conductivity cell, which is composed ofReference electrodeMeasuring electrodesGas liquid separator、ion exchange resin、
Reaction coilNaOHComposition of conductive fluid, etc. The advantages of conductivity cell are low price and easy accessibility, but poor stability.
8、 Ozone oxidation method
By utilizing the strong oxidizing properties of ozone and using ozone oxidation as the detection technology for TOC, it has a fast reaction rate and no secondary pollution,
And with high application value. Therefore, the application prospects of this method are very promising.
9Ultrasonic cavitationSonoluminescencemethod
Ultrasonic chemistry has become a thriving research field, and the study of sonoluminescence has been involved in the field of environmental protection
Related scholars have done a lot of work in both basic and applied research, and in recent years, this unique method has been extensively studied
Family recognition. It has the advantages of no secondary pollution, no need to add reagents, and simple equipment.
10Supercritical waterOxidation method
Suitable for applications with high salt content, Supercritical Water Oxidation (SCWO) technology was originally used to treat large volumes of wastewater, sludge, and polluted soil. It is now used in commercial laboratory TOC analyzers to increase the temperature and pressure of the sample water to a level higher than that of watercritical pointAt 375 ° C and 3200 psi,Organic wasteQuickly and thoroughly oxidized by oxidants in water. The characteristics of supercritical water can efficiently and rapidly oxidize organic carbon to carbon dioxide, even in the presence of chlorides and other inorganic substances that can cause negative interference when using non supercritical oxidation methods.
Technical parameters:
Measurement range: 0-100000ppm C (non diluted state), 0-5000ppm N.
Automatic injection, obtaining 6 results in one injection: TOC/TIC/TC/NPOC/POC/TNb 。
Optional fully automatic porous samplerTotal nitrogen(TNb) Analysis module, solid analysis module. Measurement error and accuracy ≤ 1%.
Application:
Meet the requirements for medical injection water testing.
Cleaning validation (compliant with FDA/USP/EP). Drinking water, surface water, tap water, drainage, sewage
Different industries such as environmental protection and hydrological monitoring.
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