Example datasets from the NAFTA guidance published 2015

Data taken from US EPA (2015), p. 23.

NAFTA_2015_datasets

Format

1 dataset with observations on the following variables.

name

a factor containing the name of the observed variable

time

a numeric vector containing time points

value

a numeric vector containing concentrations

Source

NAFTA (2011) Guidance for evaluating and calculating degradation kinetics in environmental media. NAFTA Technical Working Group on Pesticides https://www.epa.gov/pesticide-science-and-assessing-pesticide-risks/guidance-evaluating-and-calculating-degradation accessed 2019-02-22

US EPA (2015) Standard Operating Procedure for Using the NAFTA Guidance to Calculate Representative Half-life Values and Characterizing Pesticide Degradation https://www.epa.gov/pesticide-science-and-assessing-pesticide-risks/standard-operating-procedure-using-nafta-guidance

Examples

  nafta_evaluation <- nafta(MRID_555555)
#> The SFO model is rejected as S_SFO is equal or higher than the critical value S_c
#> The representative half-life of the IORE model is longer than the one corresponding
#> to the terminal degradation rate found with the DFOP model.
#> The representative half-life obtained from the DFOP model may be used
  print(nafta_evaluation)
#> Sums of squares:
#>       SFO      IORE      DFOP 
#> 1378.6832  615.7730  517.8836 
#> [1] 717.4598
#> 
#> Parameters:
#> $SFO
#>                   Estimate       Pr(>t)        Lower        Upper
#> parent_0      83.755751519 8.076390e-15 76.928220975 90.583282063
#> k_parent_sink  0.001703321 7.452357e-05  0.001108568  0.002617164
#> 
#> $IORE
#>                         Estimate Pr(>t)        Lower        Upper
#> parent_0            9.685291e+01     NA 8.752855e+01 1.061773e+02
#> k__iore_parent_sink 8.403374e-14     NA 1.092054e-19 6.466412e-08
#> N_parent            6.684458e+00     NA 3.538511e+00 9.830405e+00
#> 
#> $DFOP
#>              Estimate       Pr(>t)        Lower        Upper
#> parent_0 9.755655e+01 4.439930e-13 8.884447e+01 1.062686e+02
#> k1       4.240633e-02 3.554769e-02 1.414189e-02 1.271610e-01
#> k2       8.237928e-04 2.060933e-02 3.172784e-04 2.138925e-03
#> g        2.881037e-01 1.313715e-04 1.783967e-01 4.299694e-01
#> 
#> 
#> DTx values:
#>      DT50    DT90 DT50_rep
#> SFO   407    1352      407
#> IORE  541 5192066  1562968
#> DFOP  429    2383      841
#> 
#> Representative half-life:
#> [1] 841.4096
  plot(nafta_evaluation)