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  Chemistry and Biotechnology - Teledyne Tekmar - Torch Combustion TOC Analyzer



Torch Combustion TOC Analyzer
Tekmar’s newest addition to the TOC analyzer product line, the Torch, utilizes a patent pending Static Pressure Concentration (SPC) for the analysis of TOC/TN using high temperature combustion.

The Torch Analyzer contains a built in autosampler with three vial rack choices and PC driven control. This features automated calibration and Intellidilution which automatically dilutes over-range samples to within the working calibration range. Maintenance is simplified by design allowing easy access to all areas of the unit.

All of these features and competitive price positioning make this system ideal in keeping costs down and maintaining productivity in the laboratory.

Methods EPA 415.1, 415.3 and 9060A, Standard Method 5310B, EP 2.2.44, ISO 8245,EN 1484, USP 643 (Chapter 24), ASTM D2579, prENV 13370, AOAC 973.47
Features:
icon Built-in benchmark diagnostic check - including leak check
icon Ability to program and store furnace temperatures to accommodate various methods
icon Static Pressure Concentration Technology (patent pending)
icon Intellidilution feature automatically detects samples that have exceeded the selected calibration range and dilutes it to fall within the selected range
icon Multiple pre-set application ranges for analytical requirements
icon Auto-calibration eliminates the need for manual standard preparation
icon Detection Levels:
-Carbon 50ppb to 30,000ppm
-Nitrogen 50ppb to 2,000ppm
icon Simultaneous analysis for Carbon and Nitrogen
icon Easy access for maintenance of combustion tube
icon Improved catalyst
icon Built-in autosampler
icon Increased throughput with ASM Sparge
icon Auto-blanking
icon Mass Flow Controller
icon Optional vial mixing capabilities
icon Optional TN Module
Applications and Industries
icon Source Waters (ground, surface, and drinking water)
icon Waste Water
icon Sea and Salt Water:
♦ Sea ~3.5% salt
♦ Brines 5%-20%
♦ Industrial Effluent 0-20%
Methods
icon EPA 415.1, 415.3 and 9060A,
Standard Method 5310B,
EP 2.2.44, ISO 8245,
EN 1484,
USP 643 (Chapter 24),
ASTM D2579,
prENV 13370,
AOAC 973.47
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

 

Option
Total Nitrogen Module
  • Optional Nitrogen module
  • Manufactured by Teledyne Tekmar.
  • 50ppb to 2000ppm working range.
  • Simultaneous Carbon and Nitrogen analysis.
  • Uses Chemilluminescence Detector.
  • Does require oxygen supply for ozonation.
  • Specifications
     
     
     
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