The TOC-VWS/TOC-VWP is an Analyzer Wet Oxidation/NDIR Method Model. The newly designed high sensitivity NDIR achieves high sensitivity measurements. By minimizing the reagent blanks that hinder accurate analysis, sensitivity and accuracy can be enhanced. Powerful oxidation takes place through a combination of peroxosulfuric acid, UV illumination and heating. There is no need of purging of reagent bottle reduces consumption of carrier gas. The feature of this product is measurement principle such as:
- TC measurement: To the sample, phosphoric acid asnd the oxidant which is persulfate are added and then heated under UV illumination to convert the TC to carbon dioxide which then flows with the carrier gas via the dehumidifier into the NDIR sample cell. The area of the carbon dioxide peak signal is measured and that area is converted to TC concentration using a pre-prepared calibration curve.
- IC measurement: The sample is acidified with phosphoric acid and sparged to convert the IC in the sample to carbon dioxide. Carbon dioxide is detected by the NDIR and the sample IC concentration is measured in the same way as the TC.
- TOC Measurement: Subtract the IC concentration from the TC concentration to determine the TOC concentration.
- NPOC Measurement: The sample is acidified with phosphoric acid and sparged to eliminate the IC. The NPOC concentration is determined by measuring the TC (=NPOC) of the sample after the IC is eliminated, using the same method as for TC measurement.