Page 5 - Shimadzu TOC-V Series

Shimadzu Wet Oxidation TOC Analyzers Aim for High
Sensitivity with Great Oxidation Performance

Wet oxidation/NDIR method

TOC-VWP Trace level TOC measurement in ultra-pure water.

TOC-VWS
Conditions
High-accuracy measurement of TOC
Analyzer TOC-VWS as low as 2µg/L (ppb)
Principle TOC measurement by IC removal
(acidifying and sparging)
Injection volume 20.4 mL
Number of measurements 5

Results
Number Results (µg/L)
#1 2.31
#2 2.27
#3 2.52
#4 2.47
#5 2.49
mean 2.41
SD 0.114µg/L
CV 4.73%

TOC-VWP TOC-VWS

Measurement flow line diagram
TOC-Vwp
Newly designed high-sensitivity NDIR achieves Powerful oxidation through a combination of
ultrahigh sensitivity measurements. peroxosulfuric acid, UV illumination, and heating.

Sensitivity and accuracy enhanced by minimizing No need of purging of reagent bottle reduces
the reagent blanks that hinder accurate analysis. consumption of carrier gas.

Dehumidifier/
gas pretreatment unit
Gas flow
Measurement Principles rate Carrier gas
Carrier gas controller
TC Measurement TOC Measurement inlet
Phosphoric acid and the oxidant (persulfate) are added to the Subtracting the IC concentration from the TC concentration Acid Dilution water
Data
sample, which is heated under UV illumination to convert the TC determines the TOC concentration. Oxidant processor
RS-232C
in the sample to carbon dioxide. This carbon dioxide flows with Autosampler
ASI-V Non-dispersive Computer
the carrier gas via the dehumidifier into the NDIR sample cell. infrared detector (not included with
TOC system)
(NDIR)
The area of the carbon dioxide peak signal is measured and this IC sparger
Oxidation reactor
peak area is converted to TC concentration using a pre-prepared Drain (UV illumination, heating)
calibration curve.
IC Measurement NPOC Measurement Sample
The sample is acidified with phosphoric acid and sparged to The sample is acidified with phosphoric acid and sparged to
convert the IC in the sample to carbon dioxide. This carbon eliminate the IC. The NPOC concentration is determined by
dioxide is detected by the NDIR and the sample IC concentration measuring the TC (=NPOC) of the sample after the IC is
is measured in the same way as TC. eliminated, using the same method as for TC measurement.

TOC-V Series
4 Wet Oxidation TOC Analyzer 5