Concentration (mg/L) Absorbance
0.66 0 slope=
1.49 0.09 0.08
3.02 0.19 intercept =
5.16 0.36 -0.04
n= 4
mean y = 0.16
sum(xi - mean x )^2 11.74
Measured y= 0.09
k = Number of replicae measurementes of y= 1
Derived x 1.63
sx 14.65
Concentration (mg/L) Absorbance
0 0 slope=
1.25 0.16 0.06
2.5 0.25 intercept =
5 0.33 0.05
n= 4
mean y = 0.19
sum(xi - mean x )^2 13.67
Measured y= 0.09
k = Number of replicae measurementes of y= 1
Derived x 0.63
sx 16.95
Concentration (mg/L) Absorbance
0.66 0.09 slope=
1.49 0.18 0.08
3.02 0.28 intercept =
0.05
n= 3
mean y = 0.18
sum(xi - mean x )^2 2.86
Measured y= 0.45
k = Number of replicae measurementes of y= 1
Derived x 5.16
sx 29.15
Concentration (mg/L) Absorbance
0 0
1.25 0.16
2.5 0.25
5 0.33
n= 4
mean y = 0.16
sum(xi - mean x )^2 11.74
Measured y= 0.09
k = Number of replicae measurementes of y= 1
Derived x 1.63
sx 14.65
m= 0.08 -0.04 - =b
sm= 0 0.01 - = sb
R^2 0.99 0.02 - = sy
Concentration (mg/L) Absorbance
0.66 0 slope=
1.49 0.09 0.08
3.02 0.19 intercept =
5.16 0.36 -0.04
n= 4
mean y = 0.16
sum(xi - mean x )^2 11.74
Measured y= 0.09
k = Number of replicae measurementes of y= 1
Derived x 1.63
sx 14.65
External Calibration of Standard Solutions
1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
Concentration (mg/l)
Standard Additions Plot of Samples
0.5
0.45
0.4
0.35
0.3
Absorbance
0.25
0.2
0.15
0.1
0.05
0
0 1 2 3 4 5 6 7 8 9 10 11
Amount of Fe added (ppm)
External Calibration Plot
0.35
0.3
0.25
)
External Calibration Plot
0.35
m 0.08 -0.04 b 0.3
sm 0 0.01 sb
R^2 0.99 0.02 sy 0.25
Absorbance (Abs)
0.2
Col
0.15 Line
Col
0.1 0.0
0.01 Line
0.2 0.0
0.05
0
0 1 2 3 4
Concentration (ppm)
m 0.06 0.05 b
sm 0.02 0.04 sb
R^2 0.9 0.06 sy
0.01 0
0.2 0.16
0.25
0.33
m 0.08 0.05 b
sm 0.01 0.03 sb
R^2 0.97 0.02 sy
0.01
0.2
0 0
0.16 0.16
0.25 0.25
0.33 0.35
14.26 0.15
0.19 0.19
76.96
m 0.08 -0.04 b
sm 0 0.01 sb
R^2 0.99 0.02 sy
0.01
0.2
ation Plot
ation Plot
Column C
Linear regression for
Column C
0.09
Linear regression for
0.09
3 4 5 6
n (ppm)
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