Apparatus:Any suitable apparatus capable of discriminating between organic and inorganic carbon either by purging inorganic carbon from the sample under examination before oxidisation or by the measurement of the inorganic carbon and subtraction from the total carbon, may be used.
Related: Calibration of TOC (Total Organic Carbon) Analyzer
TOC water:Highly purified water complying with the following specifications:
Conductivity:Not more than 1.0 microS cm-1 at 25°.
Test solution:Collect carefully the water to be tested in an airtight container with minimum head space and examine it with minimum delay.
Standard solution:Dissolve sucrose, previously dried at 105° for 3 hours, in sufficient TOC water to produce a solution containing 1.19 mg of sucrose per litre (0.50 mg of carbon per liter).
System suitability solution:Dissolve 1,4-benzoquinone in sufficient TOC water to produce a solution containing 0.75 mg of 1,4-benzoquinone per liter (0.50 mg of carbon per liter).
Control solutions:Prepare suitable blank solutions or other solutions needed for establishing the base for calibration adjustments. Run the appropriate blanks for zeroing the instrument.
System suitability:Run successively the TOC water, standard solution and system suitability solution and record the responses rw, rs and rs" respectively. Calculate the percentage response efficiency from the expression:
Procedure:Run the test solution and record the response, rt. The test solution complies with the test if rt is not greater than rs-rw.
Related: SOP for Calibration Total Organic Carbon (TOC) Analyzer
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