In view of the problems existing in the detection methods of trivalent chromium ion(Cr

3+

)in industrial wastewater

such as expensive equipment

complex processes and poor economic efficiency

a detection scheme for trivalent chromium ions content based on quartz crystal microbalance(QCM)is proposed.By utilizing the linear relationship between the QCM resonant frequency and the loaded mass on the crystal surface

and combining with the selective adsorption capacity of zinc oxide nanoparticles(ZnO-NPs)for trivalent chromium ion

a heavy metal detection sensor is prepared to realize the detection of trivalent chromium ion solutions with different contents.Experimental results show that the method has high precision

high stability and high

accuracy

and the error between the theoretical value and the actual value is less than 7.5%.