The formation of the complex between lead ion and immobilized xylenol orange caused a large reflected light intensity change, and lead ion in the solution can be determinated.

• 铅离子与固定在阴离子交换树脂上的二甲酚橙的络合反应,使试剂相光反射强度发生了很大的变化,从而使溶液中的铅离子得以测定。