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From: Yaritza Brinker <YBrinker**At_Symbol_Here**FELE.COM>
Subject: Re: [DCHAS-L] Nitric Acid Disposal
Date: Jul 16, 2021 20:56 UTC
Reply-To:
ACS Division of Chemical Health and Safety
In-Reply-To: Re: [DCHAS-L] Nitric Acid Disposal
Hmm�
Nital is a go-to etchant for steels and it's 1% to 5% Nitric in ethanol or methanol. It is commonly used (and available for purchase) at 2% and 3%. The 20% must have been a typo in the literature.
There is an analog to Nital that is 10% nitric in methanol and it's used for etching pure cobalt. If you buy this etchant pre-mixed, it will commonly contain 5% water.
Thank you,
Yaritza Brinker
260.827.5402
From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
On Behalf Of Daniel Kuespert
Sent: Thursday, July 15, 2021 10:14 AM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Subject: Re: [DCHAS-L] Nitric Acid Disposal
** External Email **
Acetic acid or acetic anhydride can explode with nitric acid if not kept cold. Experiments demonstrate that mixtures containing more than 50% by weight of nitric acid in acetic
anhydride may act as detonating explosives under certain conditions. An indication is given of the percentage mixtures of acetic anhydride-nitric acid which could be detonated using a priming charge and detonator.