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  Chemistry and Biotechnology - Teledyne Tekmar - Fusion UV/Persulfate TOC Analyzer

Fusion UV/Persulfate TOC Analyzer
Almost 40 years ago, Dohrmann began designing and manufacturing premier Total Organic Carbon (TOC) Analyzers. Since joining the Tekmar family, the tradition of producing innovative laboratory TOC analyzers continues. The Dohrmann Series Fusion Total Organic Carbon Analyzer is no exception. The Fusion TOC Analyzer offers more flexibility, intelligence and user friendliness making this analyzer ideally suited for the most demanding laboratory needs.
Walk-Away Automation and Intuitive Software Control
The Fusion Total Organic Carbon Analyzer utilizes powerful UV Persulfate oxidation allowing superior carbon liberation from even the most challenging matrixes. By implementing the patented Static Pressure Concentration (SPC) technology, the Fusion Total Organic Carbon Analyzer is able to achieve unprecedented low-end sensitivity from a Non-Dispersive Infrared (NDIR) detector. The Fusion Analyzer is built on the latest technology and is designed to offer productivity for a wide variety of applications.
The Fusion Total Organic Carbon (TOC) Analyzer and TekLink™ Software offer solutions for increased sample throughput while improving the reliability of the analysis data. A few of the features that provide increased ease of use are:
icon Unattended auto-calibration monitoring
icon Automatic dilution capabilities from stock standards or samples
icon Intellidilution for automatically diluting a sample back into calibration range.
icon Automated self-diagnostic tools including leak check
icon 21 CFR 11 functionality - Electronic Records and Electronic Signatures (ERES) including audit trails and user-account management
icon Exportable reports in user-definable formats including metadata and versioning
icon Turn-key method development and schedule builder
icon Mass Flow Controller (MFC) for reduced gas consumption and enhanced flow control
Applications and Industries
icon Drinking Water
icon Pharmaceutical
icon Environmental
icon EPA 415.1- 415.3, 9060A,
icon Standard Method 5310C, ASTM D4779 and D4839,
icon prENV 13370,
icon Cleaning Validation / USP TOC Method <643> / EP 2.2.44 / JP
NDIR Pressurization Overview
Typical Static Pressure Concentration (SPC) Pressurized detection, or static read, is a technique used for concentrating the CO2 produced by the oxidation of the sample. The technique can be used for both qualitative and quantitative analysis. In this section the basics of the pressurization technique will be described.
Using the traditional use of NDIR technology, these measurements are performed by oxidation of the specific carbon component by UV/Persulfate oxidation to create CO2, which is swept through an NDIR detector. In this technique, the adsorption of the infrared light is measured over time as the CO2 is swept through the detector. The resulting measurement correlates to a peak, which can be integrated and correlated to a concentration.
The use of a pressurized detection scheme, or static read, allows for the specific carbon component to be oxidized and the resultant carbon dioxide swept into the detector using a non-interfering, inert gas, which is metered by a mass flow controller. A valve located at the outlet of the detector prevents the escape of any of the CO2 from the detector. A single measurement can be made to determine the amount of CO2 in the detector cell. The reading correlates directly to the concentration of the carbon contribution from the sample.
An inherent advantage of this technique is that all of the CO2 is in the cell at the same time for the detector measurement. With all of the CO2 in the cell, the sensitivity of the analysis is significantly increased.
Another advantage of this application is that there is one measurement made that represents the concentration of CO2 in the cell versus multiple measurements made in flow-through designs over time that result in a peak. Since this technique is a static read, it eliminates the inherent error that is associated with time delays between measurements with traditional flow-through technology. These time delays add error to the integration of the CO2 peak. The elimination of this error allows for lower detection limits and increased precision. The static read of the detector is accomplished by pressurizing the detector cell with carrier gas, which contains the CO2 from the oxidized sample. The pressure required for static read is generally between 30-60psig. Tekmar’s recommended pressurization setting is 50psig.
Comparison of total organic carbon analysis methods

Combustion TOC

UV Persulfate

l  Excellent oxidation of all organics

l  Able to analyze salt samples

l  Relatively high system blanks

l  Poor precision and accuracy at low ppb levels

l  Good for particulated samples

l  Higher system maintenance and cost of ownership

l  Low system blanks

l  Excellent precision at low ppb levels

l  Difficulty with particulated samples

l  Lower maintenance and cost of ownership


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