在PH=5.1的六次甲基四胺缓冲溶液中,在表面活性剂溴化十六烷基吡啶[增敏作用]存在的条件下,二甲酚橙(XO)与铅形成稳定的1:1红色络合物,在波长为585mm处有最大吸收峰,表观摩尔吸光系数为6.99×104,是无表面活性剂存在时的4.5倍,铅含量在0-25ug/50ml,范围内符合比尔定律,方法:简便有效可广泛应用。 Xylenol orange (XO) forms a stable 1: 1 ratio with lead in hexamethylenetetramine buffer solution at pH = 5.1 in the presence of the surfactant cetyl pyridinium bromide [sensitization] 1 red complex has a maximum absorption peak at a wavelength of 585 mm, an apparent molar absorptivity of 6.99 × 10 4, a 4.5-fold increase in the presence of a surfactant, and a Pb content in the range of 0 to 25 μg / 50 ml, Laws, methods: simple and effective can be widely used.