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DMSO /H2O (VV = 31) HEPES(cas 7365-45-9) buffer system

In view of the fact that copper ions can bind to cyanide ions (CN-) to form stable complexes, the continuous recognition properties of CN-complexes formed by L and Cu ions are studied on the basis of previous work.

The results show that L and Cu2 + can form a stable green complex CuL2, which can identify CN- in water with specific selectivity and high sensitivity. In CuL2 DMSO /H2O (VV = 31) HEPES(cas 7365-45-9) in the buffer system (pH = 7.0) was added F-, Cl-, Br-, I-, AcO-, HSO4-, ClO4-, N3-, SO42-, NO3-, SCN- and CN-, the addition of CN- is such that the color of the solution changes from green to colorless, and the maximum absorption peak of CuL2 at 446 nm disappears in the UV spectrum. The detection limit of CSL2 was 8.0 × 10-6mol / L, and the detection limit of UV spectrum was 4.0 × 10-7mol / L (0.4μmol·L-1), which was lower than that of the other. The standard of CN- in normal drinking water (<1.9 μmol·L-1) is prescribed by the World Health Organization.

The results show that CuL2 is a good CN-colorimetric recognition receptor, and it has high selectivity, high sensitivity and strong anti-interference ability to CN- in aqueous medium. We prepared CNL test paper based on CuL2, convenient and efficient detection of CN- in water.



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