Std_Curve {SoilTesting}

Elemental concentration in solution from absorbance or emission values

Description

The concentration of the element in question is obtained by this function based on absorbance or emission values corresponding to the concentrations of that element in the working standard solutions.

Usage

Std_Curve(C_Std = C_Std, A_E_Std = A_E_Std, A_E_Sample = A_E_Sample,...)

Arguments

C_Std

Concentration of the element in the working standard solutions (mg/L)

A_E_Std

Absorbance or Emission reading of the working standard solutions

A_E_Sample

Absorbance or Emission reading of the sample solutions

...

Any other arguments that can be passed to base plot, such as main = "title", xlab = "Emission", ylab = "Concentration"

Details

For elements like phosphorus (P), sulphur (S), boron (B), the determination of concentration in the extract is done by a spectrophotometer based on absorbance readings corresponding to different known concentrations. For elements like potassium (K), sodium (Na), the determination of concentration in the extract is done by a flame photometer based on emission readings corresponding to different known concentrations. In each case, a standard curve is fitted between the absorbance or emission readings and the concentrations of the particular element in the working standard solutions. A linear regression equation can be fitted to the curve, based on which the concentration of the element under consideration in the sample extract can be determined.

Value

Sample_mgL - Concentration of the element under consideration in the solution used for absorbance or emission reading (mg/L)

Examples

with(df_Std_Curve, Std_Curve(C_Std = C_Std, A_E_Std = A_E_Std,
A_E_Sample = A_E_Sample, xlab = "Emission", ylab = "Concentration"))