A potassium dichromate molecularly imprinted membrane was prepared on the surface of a gold electrode modified with chitosan by precipitation polymerization

the performance and effect of molecularly imprinted membrane were investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV)

factors affecting the properties of sensor

such as optimal concentration

elution time and scanning liquid were investigated

the result showed that the sensor had a good selectivity to potassium bichromate. Under the optimized experiment conditions

the current response of the imprinted sensor had a good linear relationship with the concentration of potassium dichromatein in the range of 0 ~31× 10

-3

mg/L

the regression curve was

y

=25.02

x

— 0.0073

R

2

=0.9991

and the detection limit was 2.47×10

-6

mg/L. The molecularly imprinted electrochemical sensor also had good stability and selectivity

at the same time

it was used to detect the potassium dichromate content in tea in the actual environment.