TOC ANALYZER 

Carbon found in the waste water and source water comes from several inorganic and organic compounds dissolved in the water. Among them carbon from the organic compounds, determined as total organic carbon (TOC), is an important parameter in evaluating water quality.  TOC Analyzer however can determine not only TOC but also can determine total inorganic carbon (TIC) and total carbon (TC).

Principle of operation

Measurement of TIC and TOC is based on the conversion of carbon in inorganic compounds and organic compounds into CO2 and relating the amount of CO2 generated to IC and TOC respectively. With simple acidification IC can be converted into CO2. TOC however is converted into CO2 by a photo catalytic oxidation with Titanium Dioxide (TiO2) as a catalyst.

Description of the instrument The block diagram of TOC analyzer is shown in figure1. It consists of a photo reactor cell with a sample injection port. The CO2 generated in the reactor cell is circulated in a closed loop over an NDIR sensor by using a circulating pump. The photo catalytic reactor cell surrounds a UV lamp, which when put on, irradiates the sample with UV light. The moisture and halogen present in the CO2 is  trapped before it reaches the NDIR Sensor. A two-way fourport valve is used to purge out the CO2 generated after every analysis and ready the instrument for the next analysis.

Analysis

Sample (10ul-3ml) is injected directly into the photocatalytic reactor cell containing a mixture of TiO2 and Perchloric acid. The analysis consists of two steps. In the first step the IC in the injected sample is converted into CO2 in the presence of acid. The amount of CO2 generated is determined and is related to IC. In the second step UV light is put on and in this step the organic carbon is converted by photo catalytic oxidation into CO2 in the presence of TiO2. The amount of CO2 generated in second step is related to the amount of TOC. The sum of TIC and TOC is the amount of TC(figure 2).

Specification

Oxidation process :Photo catalytic

Oxidation by TiO2

CO2 Detection : NDIR

Analysis Option : TC, TOC, IC

TOC Measuring range : 10-5000 mg/L

Analysis Time : 30 minute

Injection Volume : 10 µl to 3 ml

Precision : +/- 1% of full scale

Communication : RS232

Operating Voltage : 230 V

Dimension(HxWxD) :520x310 x 345 mm