BUCHI DuMaster D-480 - Manual (Page 58)

Operation Manual D-480 ©BÜCH Labortechnik AG
4 - Understanding the instrument and planning its use 58
Blank value determination
In blank value determination, the peak area values of the blank samples are averaged. The blank
value is computed according to this formula:
where:
/b = blank value
b
i
= peak areas of the individual blank samples
n = number of blank samples
i = index from 1 to n
Blank value compensation
The peak areas of the other samples are compensated with the aid of this formula:
where:
a
comp
= compensated peak area
a = measured peak area of the sample
/b = blank value
Formula for determining the daily factor
Determining the daily factor
Standard samples are analyzed to determine the daily factor. The known element concentration of the
standard samples is correlated with the actual element concentration computed.
Daily factor
The daily factor is computed according to this formula:
whereas:
f = daily factor
c
theo
= theoretical element concentration
c
act
= element concentration computed actually