Metals

Concentration of the standards in (mg/l)

Correlation coefficients

Equation for calibration curve (A = mC + b)

Ca

5, 10, 15, 20, 25

0.9997

A = 0.1159 C + 0.0137

Mg

5, 10, 15, 20, 25

0.998

A = 0.177 C + 0.2276

K

0.065, 0.41, 0.785, 1.11, 1.57

0.998

A = 0.1676 C − 0.0858

Fe

1, 2.5, 5, 8, 10

0.9987

A = 0.028 C − 0.0048

Mn

0.5, 1.5, 3, 5, 9

0.998

A = 0.1358 C + 0.0872

Zn

0.25, 0.5, 1.0, 1.5, 2.0

0.999

A = 0.333 C − 0.0126

Cu

0.15, 0.35, 0.61, 0.84, 1.5

0.9999

A = 0.0837 C + 0.0169

Cr

0.05, 0.5, 1.0, 1.5, 2.0

0.9997

A = 0.01 C + 0.0017

Cd

0.5, 1.0, 1.5, 2.0, 2.5

0.997

A = 0.292 C + 0.056