Amyl nitrite, like other alkyl nitrites, reacts with carbanions to give oximes. Nitrites and nitrates can be converted into nitrosamines, some of which are carcinogenic. Treated water is tested for impurities including pathogens, nitrates, and nitrites. Nitrosamines are carcinogenic compounds formed by the reaction of nitrites and amines. Accidental aspiration of amyl or butyl nitrites may cause lipoid pneumonia. Nitrosamines are produced by the reaction of nitrites and secondary amines. Amyl nitrites were discontinued in 2012 in standard cyanide kits. Poppers contain a class of chemicals called alkyl nitrites. The main pollutants include copper, zinc, manganese, nitrites and nitrogen. Furthermore, the type of bacteria also affects sodium nitrites effectiveness. To the extent that poppers products contain alkyl nitrites, the following applies. Nitrites are soluble, so rain rapidly carries them away. Brunton also found that propyl nitrites had the same effects as well. This prompted distributors to sell other alkyl nitrites not yet banned, like ispropyl nitrites. The nitrites were administered to produce methemoglobin and induce vasodilation.