水合Ce3+离子发射强荧光, 而用Ce3+滴定植物钙调素(CaM)时, Ce3+离子荧光被完全淬灭, 据此建立了测定Ce3+离子与植物钙调素结合位点数及逐级结合常数的方法. 实验表明, Ce3+离子与植物钙调素的荧光激发光谱及发射光谱形状与光谱强度都有显著差别, 前者的荧光强度远大于后者, 故CaM存在时可以测定游离Ce3+的浓度. Ce3+离子荧光淬灭法测定结果说明, 在0.5 mol·L-1 KCl溶液中, CaM有4个Ce3+离子结合位点. 进一步通过Ce3+滴定植物钙调素的实验, 并结合Excel规划求解法, 计算出Ce3+与CaM的结合常数, K1＝4.17×107, K2＝1.26×107, K3＝1.89×106, K4＝2.04×106.
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