Bromide Notification

The NADP Central Analytical Laboratory (CAL) determined that web-published bromide data from January 2012 through June 2018 have a known or suspected bias caused by the presence of oxalate in the precipitation. Motions to remove these data from the NADP website and discontinue bromide as an official NADP analyte (due to >80% non-detects) were presented to the NADP Executive Committee on May 17, 2019 and were approved. This note serves as notification that these motions have been executed – all bromide data, including maps, was removed from the NADP website on October 15th, 2019; and as of June 1st, 2019 the NADP CAL is no longer quantifying bromide. Preliminary, summary and individual sample reports will no longer include bromide results (though for a period of time the published data file format will continue to include the bromide column, but without analytical results). Bromide data from June 2018 through June 2019 (which is valid) and the larger bromide data set will be archived and made available upon request. A link to documents providing background on this bromide issue will be placed on the NADP website. Please contact David Gay at David.Gay@slh.wisc.edu with any questions and data requests.