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Al（Ⅲ）水杨醛苯甲酰腙荧光体系，在Ni（Ⅱ）的存在下，荧光发生熄灭现象。Ni（Ⅱ）量在10－8～10－6M范围内，体系的荧光强度与其含量呈良好的线性关系，检测眼达10－8M级。此法测定Ni（Ⅱ）比原子吸收光谱法（10-7M）和比色法（10－6M）灵敏度高。
Al (Ⅲ) salicylaldehyde benzoyl hydrazone fluorescence system, in the presence of Ni (Ⅱ), fluorescence quenching phenomenon. The Ni (Ⅱ) content in the range of 10-8 ~ 10-6M, the fluorescence intensity of the system and its content showed a good linear relationship, the detection of eye up to 10-8M level. This method is more sensitive than atomic absorption spectrometry (10-7M) and colorimetric method (10-6M) for Ni (Ⅱ).