TOC-VWS/TOC-VWP

4.2
/
5.0
  |  2 reviews


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Average Rating: 4.2
2 Scientists have reviewed this product

4 out of 5
Ease of use
5 out of 5
After sales service
4 out of 5
Value for money


Rating: 4.7

  • Application Area: Waste water analysis

"Easy to use, it is possible to analyze different volumes. The running costs are not very expensive and the analysis times are fast."

Review date: 11 Jul 2012 | TOC-VWS/TOC-VWP
  • Status:

    Reviewer

  • Member since: 2010

  • Organization: Exova



  • Ease of use
    3 out of 5
    After sales service
    4 out of 5
    Value for money
    4 out of 5
Rating: 3.7

  • Application Area:Waste Water Analysis

"A very good instrument, precise, accurate and value for money. The analytical range is very good for TOC and TN."

Review date: 30 Apr 2012 | TOC-VWS/TOC-VWP
Newly designed high-sensitivity NDIR achieves ultrahigh sensitivity measurements.

Sensitivity and accuracy enhanced by minimizing the reagent blanks that hinder accurate analysis.

Powerful oxidation through a combination of peroxosulfuric acid, UV illumination, and heating.

No need of purging of reagent bottle reduces consumption of carrier gas
 
Measurement Principle
TC Measurement

Phosphoric acid and the oxidant (persulfate) are added to the sample, which is heated under UV illumination to convert the TC in the sample to carbon dioxide. This carbon dioxide flows with the carrier gas via the dehumidifier into the NDIR sample cell. The area of the carbon dioxide peak signal is measured and this peak 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. This carbon dioxide is detected by the NDIR and the sample IC concentration is measured in the same way as TC.
TOC Measurement

Subtracting the IC concentration from the TC concentration determines 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.

Product Overview

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TOC-VWS/TOC-VWP

Manufacturer Shimadzu Scientific Instruments Inc.

4.2 / 5.0 | 2 reviews