《世界卫生组织饮用水水质准则》(以下简称《准则》),对饮水中有潜在危害的成分和感官性质制订了建议值。通常,饮水中化学物质浓度不致产生急性健康影响。因为给水受到严重污染时,其嗅、味和外观往往不适于饮用。人们之所以关注水中的化学物质,主要因为长期饮用时它们可能影响人体健康,尤其是蓄积性毒物和致癌物质。《准则》中订有建议值的物质,均可出现于水中,且都可找到其直接或间接有害影响的证据。建议值是对容许浓度的判断;而不能理解成规定的水质标准,原则上应尽可能减少接触有毒物质。《准则》中有几项是人体必需的无机元素,但这里规定的不是它们在饮水中的最低可取浓 The WHO Code for Drinking-water Quality (hereinafter referred to as the “Guidelines”) sets out recommended values ​​for potentially hazardous ingredients and sensory properties in drinking-water. In general, concentrations of chemicals in drinking water do not cause acute health effects. Because of the serious pollution of feed water, its smell, taste and appearance are often not suitable for drinking. The reason why people pay attention to the chemical substances in water is mainly because they may affect human health when they are consumed for a long time, especially accumulative toxicants and carcinogens. Proposed values ​​in the Code may appear in the water and any evidence of their direct or indirect adverse effects can be found. The recommended value is to allow the concentration of judgment; but can not understand the required water quality standards, in principle, should minimize exposure to toxic substances. There are a few of the “Guidelines” that are essential inorganic elements of the body, but not the minimum concentrations that they require in drinking water