INFICON HAPSITE Smart Plus Chemical Identification System - Manual (Page 471)

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HAPSITE Smart Plus Operating Manual
2 Prepare the standard in volumetric glassware.
2a Follow the above procedure for spiking the standard into the measured volume
of water.
2b Stopper the flask and carefully mix by gently inverting a few times.
2c Transfer the flask’s contents to the purging vessel without agitation.
2d Immerse the probe and immediately begin the analysis.
14.11.3 Calculations
The following equation can be used to calculate the volume of standard mix that
must be injected into the water sample for the desired final concentration of VOCs.
[1]
Simplified,
[2]
Units: ng/mL (ppb); µg/mL (ppm)
NOTE: The injected standard volume is deliberately small compared to the sample
water volume so the sample composition is never significantly altered.
14.12 Calibration Curves
The HAPSITE Plus IQ software accepts single or multiple calibration points in
constructing a calibration curve of concentration vs response (target mass area).
The number of calibration points used may depend on the application’s
requirements, method protocol, response curve definition, and the analyst’s
judgment.
Injected Vol. ( L 
Water Std. Conc. (ng/mL)
Calib. Mix Conc. ( g/mL)
---------------------------------------------------------------- Water Vol. (mL) 
1000 L
1 mL
--------------------- 
1 g
1000 ng
------------------- 
=
Injected Vol. ( L 
Water Std. Conc. (ng/mL)
Calib. Mix Conc. ( g/mL)
---------------------------------------------------------------- Water Std. Vol. (mL) 
=