一般生水中含有微量的硝酸盐,经长时间沸腾后,一部分硝酸盐还原为亚硝酸盐。亚硝酸盐进入血液后,可将血液中正常血红蛋白氧化为高铁血红蛋白,从而会大大减弱正常血红蛋白的携氧功能。亚硝酸盐与胺类物质容易合成亚硝胺,而亚硝胺有极强的致癌作用,所以,水沸时间不宜长。 In general, raw water contains traces of nitrate, after a long period of boiling, a portion of the nitrate is reduced to nitrite. Nitrite into the blood, the normal blood hemoglobin can be oxidized to methemoglobin, which will greatly reduce the oxygen carrying capacity of normal hemoglobin. Nitrite and amine easily synthesized nitrosamines, nitrosamines have a strong carcinogenic effect, so the water boiling time should not be long.