Page 14 - 3_Chemical industry
P. 14

SCA-130-306



            Calibration of the TOC-L system was carried         The higher melting point point of NaSO 4 (881
            out using the automatic dilution function in the    °C) compared to NaCl (801 °C) has a positive
            range of 0.5 mg/L to 10 mg/L.                       influence on the lifetime of the  combustion
                                                                tube.


                                                                ■ Results

                                                                The  duplicate  determination  of  the  soda
                                                                solution yielded the following results:


                                                                      Sample         NPOC          RSD
                                                                                     [mg/l]         [%]
                                                                Soda solution         56,4          7,1
                                                                (50%)
                                                                Soda solution
                        Fig. Multi-point calibration            (50%)                 54,8          4,9
                          with dilution function


            For the determination, a TOC-L CPH was                 10
                                                                   9
            equipped with a kit for high salt loads. A
            special catalyst tube,  a special  mixture of         Signal[mV]  6
            various catalyst beads and a ceramics grid,            3
            which  replaces  the  platinum  net  are  part  of
            the kit.                                               0 -1
                                                                     0            5            10           15
                                                                                              Zeit[min]

                                                                   Fig. Peak graphs of a diluted soda solution
                                                                                   (ca.5%)





















                                                                ■ Recommended Analyzer / Configuration
                                                                TOC-L  CPH
                                                                ASI-L
            Sample acidification when using the high-salt       High-Salt-Kit
            kit, is carried out with sulfuric acid in order to   B-Type- Scrubber
            modify the sample matrix.
   9   10   11   12   13   14   15   16   17   18   19