| Reduce the excess permanganate in each of the first and second impingers immediately after sampling by slowly adding hydroxylamine hydrochloride directly to each impinger and gently mixing until the solutions turn clear. |
| In addition, these reactions often created unwanted side products, such as hydroxylamine, which is toxic and unstable. |
| After standing for twenty-four hours, hydroxylamine potassium disulphonate crystallizes out. |
| Note: Atomic absorption must be completed within 30 minutes of the addition of hydroxylamine hydrochloride. |
| In neutral media, reduction may yield a hydroxylamine. |
| In August 2008, China placed hydroxylamine, a precursor for ketamine, under national control. |
