As of June 12, 2018 our Privacy Policy has been updated. For individuals in the European Union, CIL uses cookies on this website. Please review the new privacy statement to see how. By continuing to use this website you agree to us using cookies in accordance with our privacy statement. Click here for the new privacy statement..OK

Corporate Overview

The Standard – January 2012

EPA Report on Monitoring Parlar Compounds

Toxaphene as a class of compounds has been regulated since the 1980s because of its persistence in the environment, and certain degradation products of toxaphene are of interest because of the manner in which they bioaccumulate in humans. Study of prolonged toxaphene usage has been hampered by the lack of availability of quality degradation products, particularly Parlar compounds. CIL has recently introduced labeled and unlabeled standards for toxaphene analysis.

Toxaphene saw extensive use as a pesticide in the United States for many decades, from its introduction in the late 1940s through its banning for all uses in 1990. It is on the list of the “dirty dozen” compounds specifically banned under the Stockholm Convention in 2004. In the US, it was used as pest control for both plants and livestock, as well as a method of keeping unwanted species of fish from small bodies of water.

This extensive use came at a heavy cost – in large amounts it can be toxic to humans, and with the use in bodies of water, can enter the water supply. Because of this health risk, many locations in which toxaphene was widely used for pest control routinely test for toxaphene levels in drinking water. As with many chemicals, exposure to the elements yields many decomposition products of toxaphene, many of which have their own detrimental effects on the ecosystem as well as potential harmful effects in humans.

Certain specific breakdown products have been identified as being of particular concern, with some of the breakdown products having even greater toxicological effects than the toxaphene itself. The US EPA has identified a half-dozen specific congeners that are detrimental to human health, Parlars 26, 40, 41, 44, 50, and 62. Cambridge Isotope Laboratories, Inc. has developed labeled and unlabeled standards for many of these degradation products and is continuing to bring new toxaphene breakdown products to market.


Part number  Description  
CLM-7930-1.2 PARLAR 26 (U-13C10, 99%)  
ULM-7828-1.2 PARLAR 26 (unlabeled)  
CLM-7931-1.2 PARLAR 50 (U-13C10, 99%)  
ULM-7829-1.2 PARLAR 50 (unlabeled)  
CLM-7932-1.2 PARLAR 62 (U-13C10, 99%)  
ULM-7830-1.2 PARLAR 62 (unlabeled)  
CLM-8705-1.2 PARLAR 32 (U-13C10, 99%)  
ULM-8665-1.2 PARLAR 32 (unlabeled)  
CLM-8719-1.2 PARLAR 39 (U-13C10, 99%)  
ULM-8767-1.2 PARLAR 39 (unlabeled)  
CLM-8720-1.2 PARLAR 69 (U-13C10, 99%)  
ULM-8768-1.2 PARLAR 69 (unlabeled)  
CLM-8721-1.2 PARLAR 70 (U-13C10, 99%)  
ULM-8769-1.2 PARLAR 70 (unlabeled)  

(All products listed above are 1.2 mL sizes in 10µg/mL in nonane)

CIL also has Parlar mixtures available:

Part #  Description Size  
ES-5345 POPS Toxaphene Calibration Solutions
CS1-CS5 (unlabeled/13C10, 99%) in nonane   
5 x 0.2 mL   
ES-5346  POPS Toxaphene Surrogate Solution (13C10, 99%) 1.2 mL   
ES-5351 POPS Toxaphene Calibration soln w/ PCB
syringe CS1-CS6 (unlabeled/13C, 99%) in nonane
6 X 0.2 mL  
ES-5352-L POPS Toxaphene Surrogate soln w/ PCB syringe
(13C10, 99%)
1.2 mL   
ES-5442  CDC POPS (W/ Parlars) Calibration Solutions
CS1-CS9 (unlabeled/13C, 99%) in nonane
9 X 200 µL   
ES-5449-10  CDC POPS (W/ Parlars) Spiking Standard (13C, 99%) 10 mL   
ES-5353  Predominant Bioaccumulative Toxaphene
Congeners Parlar 26, 50 & 62 (unlabeled) 
2 µg/mL in nonane
1.2 mL   





Stable Isotope Newsletters | Cambridge Isotope Laboratories
stable isotope, stable isotope labeled compounds, environmental contaminant standards
CIL has been ready to help with the analytical standards critical to the task of defining and resolving any major environmental contamination problems.