Urine adulteration: Can bleach be used to mask MDMA use?

Annie Q N Pham, Tamsin KELLY, Shanlin Fu

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)
34 Downloads (Pure)


Concerns regarding specimen integrity have long been a major issue of urine drug testing due to acts of urine adulteration. At a high concentration, in vitro urine adulteration using sodium hypochlorite (bleach) produced false-negative results for 3,4-methylenedioxymethamphetamine (MDMA) in CEDIA® immunoassay screening with strong negative readings. However, these strong negative readings may act as a warning sign for further investigation of the sample where the detection of a unique marker in the form of N-chloroMDMA will suggest urine adulteration via bleach. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) identified N-chloroMDMA is a major product formed between hypochlorite and MDMA in urine. N-ChloroMDMA was found stable at 4 °C for at least 10 h, but decomposed over time at room temperature (20 °C) with MDMA being identified as one of its main decomposition products
Original languageEnglish
Pages (from-to)3948-3955
Number of pages8
JournalAnalytical Methods
Issue number16
Publication statusPublished - 2013


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