INFICON HAPSITE ER Chemical Identification System - Manual (Page 450)

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HAPSITE ER Operating Manual
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 ER IQ software accepts single or multiple calibration points in constructing a
calibration curve of concentration vs response. The number of calibration points
used may depend on the application’s requirements, method protocol, response
curve definition, and the analyst’s judgment.
Figure 14-6 Figure 6-3. Multi-Point Internal Standard Calibration
Refer to Chapter 12, Target Compound Methods for complete instructions on
instrument calibration.
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) 
=