SI Analytics UviLine 8100, Operating Manual, Page: 143 / 236

Concentration mode 143
ENTER FORMULA
- Press F4 key
[Next]. It displays:
Enter a function as:
C = a5.A
5
+ a4.A
4
+ a3.A
3
+ a2.A
2
+ a1.A + a0
With C = Concentration
A = Absorbance
a0 to a5 free factors
(from 0.000 to 9999.000)
Example: Use of a K factor K (C = a1A)
-
a0 = 0
-
a1 = K (factor)
-
a2, a3, a4, a5 = Zero
Example: straight line regression (C = a1A + a0)
-
a0 = bias
-
a1 = slope
-
a2, a3, a4, a5 = Zero
Example: third degree curve (Nitrate test in sea water)
C = 0.1493A
3
– 2.5154A
2
+ 36.524A + 1.865
a0 = 1.865
a1 = 36.524
a2 = - 2.5154
a3 = 0.1493
a4 & a5 = 0