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Preliminary information

The ISOTOPEST database is a non-profit database available free of charge.

ISOTOPEST is an academic project and the authors/contributors declare no competing interests.

 

Purpose of the ISOTOPEST database

Compound specific isotope analysis is a powerful approach to track the transformation of pesticides in the environement. By comparing isotopic signatures (C, N, H, Cl…) of remaining pesticide in water or soils to the applied formulations, this approach allows to estimate both degradation extent and pathways. However, the application of CSIA to pesticides remains limited because of the difficult isotopic characterisation of pesticide commercial formulations.

Several approaches have been then proposed to estimate the primary isotopic signature (PIS) of a contaminant in groundwater: i) based on literature research, ii) based on the most negative value at the site, or iii) based on point-to-point or time to time comparison (Hunkeler et al., 2008). With limitations, theses approaches are restrained to legacy compounds point source contamination in groundwater. For pesticides specific cases, diffuse sources do not allow direct measurements of applied formulations, except in few studies including surveys among farmers.

In addition to the difficulties to assess PIS of pesticides, the development and multiplication of isotopic systems (C, N, Cl, H, S...) and analytical methods (GC-IRMS, GC-MS, LC-MS, GC-MC-ICPMS…) increase the risk of drifted or inaccurate measurements. Developping intercomparison exercises for measuring isotopes in pesticides is important for several reasons: i) ensuring accuracy and consistency (across different methods and settings), ii) identifying sources of error (calibration errors, sample contamination, or methodological differences), iii) promoting collaboration and standardization and iv) building confidence in results. Such a step is important for expanding the use of pesticide CSIA to a larger scale beyond providing proof of concepts and to accurately help future decision-making.

In order to facilitate the use of CSIA approaches for pesticide tracking, it is essential to have a comprehensive isotopic database of pesticide formulations. Available online and open to contribution, our isotopic database, ISOPEST aims to i) archive and collect data on pesticide formulations for future studies, ii) develop analytical intercomparison exercises for pesticide CSIA, iii) open the CSIA approach to large scale studies for tracking pesticide transformation.

Database statistics  Version of 10/05/2023

 

Applied formulations

Analytical standards

 
 

nformulations

nmolecule

nδ13C

nδ15N

nstandards

nmolecule

nδ13C

nδ15N

nmolecule total*

Fungicides

40

15

40

19

19

13

19

5

21

Herbicides

47

8

47

36

99

34

96

46

37

Insecticides

21

6

21

0

226

41

198

15

43

SubTotal

108

29

108

55

344

88

313

66

 

Total**

452

101

421

121

 

 

* nmolecule total corresponds to the number of different molecule available in the database by categories (fungicides, herbicides, insecticides) ** Total entries correspond to the sum of applied formulations and analytical standards entries  

How to read the database

The database is sorted by active molecules.

A first table reference the isotopic compositions of pesticide analytical standards and commercial formulations:

ManufacturerApplied/standardIsomer ?Isomer enrichedBatch/Lot n°Commercial Name/FormulationPurity (‰)δ13C (‰)± (‰)δ37Cl (‰)± (‰)δ15N (‰)± (‰)δ2H (‰)± (‰)Measurement methodReference: DOI NumberReference Citation

 

A second table reference some bio-physico-chemical informations:

Pesticide classPesticide TypeChemical formula#C#Cl#N#H#OOther ElementsMolar mass (g/mol)%C%Cl%N%H%O%OthersWater solubility at 20°C (mg/l)Melting point (°C)Boiling point (°C)log KowSoil DT 50 lab (days)Soil DT50 field (days)Koc (L/kg)

 

The different columns are filled according to available informations.

Unless specified, the bio-physico-chemical informations were recovered from the PPDB - Pesticide Properties DataBase, fully available at :

http://sitem.herts.ac.uk/aeru/ppdb/en/index.htm

Despite the carreful attention paid to the website maintenance, please inform the webmasters at "contact" if you notice a mistake in the database.