本文首次将罗丹明6G应用于镉的荧光熄灭法测定,由于体系中加入β-环糊精后稳定性大大改变,克服了罗丹明类试剂常用的卒取体系的一些缺点.在加入H_3PO_4、碘化钾-抗坏血酸、β-环糊精和罗丹明6G后,可在水相中直接用荧光法测定镉、方法灵敏、线性范围为0～0.6μg/25ml,常见离子中Bi~(?)、Pd~(?)、Hg~(2+)干扰测定,可应用于经分离后岩矿试样中镉的测定和环境水样中镉的直接测定. This paper, for the first time, applied rhodamine 6G to the determination of cadmium by fluorescence quenching, which overcomes the shortcomings of the commonly used system of rhodamine elimination by adding β-cyclodextrin to the system.When adding H_3PO_4, potassium iodide - ascorbic acid, β-cyclodextrin and rhodamine 6G, the direct determination of cadmium in the aqueous phase by fluorescence spectrophotometry is very sensitive with a linear range of 0 ~ 0.6μg / 25ml. The common ions Bi ~ (?), Pd ~ (?), Hg ~ (2+) interference can be applied to the determination of cadmium in rock samples after separation and direct determination of cadmium in environmental water samples.