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topic 32775

False positive for cyanide


I am a pretreatment coordinator and an industry here is considering using a new iron phosphating chemical that contains hydroxylamine. This new chemical does a much better job but they were told by a sister facility that this formulation may cause false positives for cyanide. Can hydroxylamine cause a false positive for CN- and if so under what circumstances? Is it possible for the testing laboraratory to overcome this? There is no CN- at all associated with this process.

Linda Holt
industrial pretreatment for a POTW - Mebane, North Carolina

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