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茚三酮和过氧化氢反应能产生微弱的荧光，微量铜（Ⅱ）的存在能大大增敏其荧光强度。基于此现象，建立了测定痕量铜（Ⅱ）的催化动力学新方法。该方法具有极高的灵敏度，检出限达7．4×10－12g／mL，线性范围为10－11~10-6g／mL，且选择性好，已成功地应用于人发和中药中痕量铜（Ⅱ）的测定。
Ninhydrin and hydrogen peroxide can produce weak fluorescence reaction, the presence of trace amounts of copper (Ⅱ) can greatly enhance its fluorescence intensity. Based on this phenomenon, a new catalytic kinetic method for the determination of trace copper (Ⅱ) was established. The method has high sensitivity, the detection limit of 7.4 × 10-12g / mL, the linear range of 10-11 ~ 10-6g / mL, and the selectivity is good, has been successfully applied to human hair and Chinese medicine Determination of trace copper (Ⅱ).