Estimate the bio concentration factor in two different ways

Estimation via direct or indirect logarithmic (log 10?) linear regression including pH, organic carbon and soil concentration

Usage

BCF_regression(
  constant,
  beta_ph,
  beta_org,
  beta_conc,
  regType = "direct",
  pH,
  org_c,
  conc
)

constant: Log constant in linear Kd regression
beta_ph, beta_org, beta_conc: Log coefficient for pH, organic carbon and soil concentration in log-linear Kd regression
regType: Chacter specifying the way the K_d value is calculated. Either "direct" which means that the regression directly leads to the sorption coefficient or"indirect" which means the regression estimates a concentration in pore water and the sorption coefficient is subsequently be calculated by the quotient of soil and pore water concentration.
pH: pH value
org_c: Organic carbon content in percent.
conc: Soil concentration in mg/kg

A vector of bio concentration factors without unit. It is defined as concentration in plant dry matter divided by concentration in soil.

The constant value, the regression parameters (beta) and the soil characteristics can be single numeric values or vectors of the same length.