The following versions of PEARLNEQ are available for download:
The differences between PEARLNEQ v6 and the previous release (PEARLNEQ v5.1) are:
- When the option ‘equal’ is used for weighing of the residuals, PEARLNEQ calculates weighing factors to ensure that the two types of measurements (i.e. the remaining mass in the system and the concentration in the liquid phase) obtain an approximately equal weight in the fitting procedure
- The weight factors are written with more decimals to the PEST input file; in previous versions only three decimals were written (e.g. 0.020 instead of 0.0204) which may result for the option ‘inverse’ into rounding errors in the order of percents
- The lower limit of the initial mass in the system has been set to 0.001 mg (was 0.1 mg)
- A small bug was repaired in the calculation procedure of the system variables at the last sampling time (in the previous version the values of the system variables at this last sampling time were those from one timestep before the last sampling time; this happened only if the calculation stopped at the last sampling time, so no error occurred if the calculation proceeded somewhat longer; as the timestep is typically in the order of 0.01 d, the error made was small).
- Additionally a procedure is provided to estimate confidence intervals of the parameters more accurately using bootstrapping. Note that the bootstrapping method was not considered in the 2021 version of the Aged Sorption guidance (EC, 2021) and should therefore not be used for refining the RSE value in the context of the regulatory guidance for aged sorption.
Notifying problems
If you encounter installation problems or problems using PEARLNEQ please use our contact form for PEARLNEQ.
