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NJDEP Lab Cert Update 1,4-Dioxane

by Olivia Vaillant

DEP_2005Last week, the New Jersey Department of Environmental Protection released an update regarding their certification abilities in regards to 1,4 dioxane. The NJDEP announced that they will no longer offer NJ-cert for 1,4-dioxane by 8260-SIM ‘User Defined’ for the FY2020 Renewals due by April 1, 2019 for processing by July 1, 2019.  It was removed from the list of methods available for NJ-cert for FY2020 (July 1, 2019-June 30, 2020). 

Licensed state remediation professionals should take note of this update as this will shut down Labs running this method for 1,4-dioxane to meet the NJ-GWQS of 0.4ug/L.  Compliance will be monitored by NJDEP OQA (Rachel Ellis, Michelle Potter, Deb Waller, Marty Hackman, and all) which certifies Labs, and NJDEP Site Remediation Program Office of Data Quality (Greg Toffoli and Amy Bowman) which reviews SRP data and issues violation letters.

Since 1,4-dioxane is completely miscible with water, it is both very mobile in the environment and difficult for the laboratory to analyze in water at levels below 1 ug/L. Alpha Analytical offers two options for analysis of 1,4-dioxane in water with reporting limits of 0.15 ug/L: Modified Method 8270 (by GC/MS SIM with isotope dilution), and Method 522 (by GC/MS SIM without isotope dilution). These extractable methods are not challenged by interference from additional chlorinated solvent compounds that may be present in the sample. For more information regarding our analytical services for 1,4 dioxane please review our technical bulletin. 


For more information on this update please refer to the following pages: 


Please post the following Addendum to the above Post:

At the recent NJ-ELAC Meeting (on 5/9/19), NJDEP stated they plan to continue allowing certification for 1,4-dioxane in water by 8260-SIM. NJDEP also recently issued a listserv notice (on 5/7/19) discussing data quality objectives and sufficient analytical sensitivity for analysis of 1,4-dioxane in water.  Refer to NJDEP OQA Bulletin Board at: 

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