目前很多单位用二磺酸酚分光光度法和镉柱还原法［１］测定饮水中的硝酸盐氮。二磺酸酚法灵敏度虽高，但干扰因素多，预处理的步骤繁琐，操作复杂。镉柱还原法操作过程也很繁杂。作者应用麝香草酚（Ｃ１０Ｈ１４Ｏ）分光光度法测定水中硝酸盐氮，对内蒙古自治区卫生防疫站... At present, many units with two sulfonic acid phenol spectrophotometry and cadmium column reduction method [1] Determination of nitrate in drinking water. Although the sensitivity of the disulfonic acid phenolic method is high, there are many interference factors, the steps of the pretreatment are cumbersome and the operation is complicated. Cadmium column reduction method is also very complicated operation process. Authors use thymol (C10H14O) spectrophotometric determination of nitrate in water, Inner Mongolia Autonomous Region Health and Epidemic Prevention Station ...