Page 34 - 5_TOC in daily practice

Sum parameter – Total Organic Carbon

Determination of limit of detection and quantification

for the NPOC method using High Sensitivity Catalyst

SCA-130-518

■ Calculation of limit of detection and

quantification according to DIN 32645

■ Measurement parameters
System: TOC-L CPH
Catalyst: High Sensitivity Catalyst
(platinum coated wool)
Method: NPOC (IC-removal)
Acidification: 1,5%
Sparge time: 2 min
Injection vol.: 408µl Characteristics
Slope a: 0,031
■ Calibration with automatic dilution Intercept b: 1,283
function Correlation coefficient r: 1,000
A 10-point calibration curve is carried out by Result uncertainty: 33,3%
using the automatic dilution of a 1.000µg/L C Probability of error (a): 5,00%
stock solution. Number of injections: 3
Standard error of estimate Sy: 0,078
Standard error of procedure Sx: 2,513
© DINTEST

Limit of detection: 4,180µg/L
Limit of quantification: 15,352µg/L

Note: The result depends on the chosen injection
volume and the purity of used gases, reagents and
ultra-pure water.