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User Information: Chlordane Pesticide Dataset

Published measurements of chlordane enantiomers in the environment

What does the dataset contain?
The dataset contains about 2,400 enantiomer specific measurements either as enantiomer ratios or fractions, as single data, means, or ranges for five chlordane compounds. These data are listed together based on their literature reference, but are also segregated by 15 different environmental compartments - including water, soil, and indoor air. The data were consolidated from personal exchanges and research published from 1992 through March 2011. The full references are in the dataset for each record.

Where can I find more information?
A review of this data is published in the ACS symposium series “Chiral Pesticides: Stereoselectivity and its Consequences” edited by A. W. Garrison, W. Liu, and J. Gan. “Chiral chlordane components in environmental matrices” by E. Ulrich and R. L. Falconer pp 11-43; DOI: 10.1021/bk-2011-1085.ch002

You may also contact Elin Ulrich for more information.

How can I view and use the dataset?
The dataset includes three parts: a description of the dataset, the measurement data itself, and the literature references. The complete dataset is available for read-only viewing as an Excel spreadsheet and in pdf format. A separate tab has been included in the spreadsheet for the description and reference information. These files can be saved as a local copy for research purposes.

View the dataset in Excel
View the dataset in pdf format

What fields and data are included in the dataset?
The table below shows a small portion of the enantiospecific environmental data as it is presented in the dataset.

Sample type CC TC HEPX HEPT OXY Type
Cornbelt air above soil (10) 0.507–0.554 0.371–0.471 0.624–0.766 F
Lake Erie air (11) 0.413–0.619 0.372–0.554 0.528–0.765 F
Technical chlordane (12) 1.01 ± 0.01 1.01 ± 0.01 R
Baltic herring (12) 1.35 ± 0.1 0.42 ± 0.02 R

The following describes the information presented in each column of the spreadsheet:

Sample type- Identity of the sample, such as collection time and location, matrix, species, tissue type, etc. The reference number(s) is also in this column.

The next five columns present the enantiomeric measurements for:

CC- cis-chlordane (parent compound ~28% in technical mixture)

TC- trans-chlordane (parent compound ~28% in technical mixture)

HEPX- exo-heptachlor epoxide (metabolite of heptachlor and chlordane)

HEPT- heptachlor (parent compound ~10% in technical mixture, also stand-alone pesticide)

OXY- oxychlordane (metabolite of chlordane)

Type- Shows whether the enantiomer data is a ratio (ER or R) or fraction (EF or F). Chromatographic elution order was not always known (noted by “1, 2”), but a later assignment sometimes is possible. The elution order becomes important when comparing data or converting an ER to EF. Several articles discuss the reason EF is preferred over ER and give warnings about conversion between them (1-3).


  1. Harner, T.; Wiberg, K.; Norstrom, R., Enantiomer fractions are preferred to enantiomer ratios for describing chiral signatures in environmental analysis. Environmental Science and Technology 2000, 34, (1), 218-220.
  2. Ulrich, E. M.; Foreman, W. T.; Helsel, D. R., Complications with using ratios for environmental data: Comparing enantiomeric ratios (ERs) and enantiomer fractions (EFs). Chemosphere 2003, 53, 531-538.
  3. De Geus, H. J.; Wester, P. G.; De Boer, J.; Brinkman, U. A., Enantiomer fractions instead of enantiomer ratios. Chemosphere 2000, 41, (5), 725-727.

Date published to the web: June 14, 2013
Last update: June 14, 2013

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