Page 11 - 4_TOC special applications

SCA-130-404

▪ Calibration ▪ Results
The instrument was calibrated using a potassium The analysis of the different water types using the
hydrogen phthalate stock solution, using the NPOC method yielded meaningful results within a
automatic dilution function, at carbon few minutes. All TOC concentrations were within a
concentrations of 0, 0,3, 1,0, 2,0 and 3,0 mg/L low range between 0,004 and 0,3mg/L, but could
(Fig1.). In order to eliminate the influence of be determined with very low standard deviations
carbon impurities in the ultra pure water used to (Fig.3).
prepare the standard solutions, the calibration
curve was shifted in parallel through the
coordinate origin. Sample NPOC SD
[mg/l] [mg/l]
Table water 0,108 0,003

Deep well water 0,042 0,006
Spring water 0,063 0,002

Natural mineral water 0,281 0,001
Fig.1: 5-point calibration in range 0 to 3mg/L
Fig.3: NPOC-Concentrations of the various water types

▪ Method parameters
Method: NPOC TOC analysis allows the manufacturers of
beverages to easily and quickly assess the content
Acidification: 1,5% of organic contaminants in their feedstock, thus
Injection volume: 1.000µl helping to optimize production processes and
Sparge time: 1,5min (in the syringe) further ensure product quality.
No. of Injections: 3 / Max. 5

▪ Recommended instrument / configuration
TOC-L CPH
ASI-L

Fig.2: 3 NPOC-Injections of spring water

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