Forchlorfenuron can inhibit the reduction reaction of potassium ferricyanide,and a new method for indirect determination of forchlorfenuron concentration by differential pulsed voltammetry(DPV)was established.In order to reduce the test workload,this paper selects a uniform design method with few test times and strong reliability,and uses the table to carry out 6 factors and 10 level optimization tests for six conditions,including the concentration of potassium sulfate supporting electrolyte,potassium ferricyanide concentration,concentration of multi-walled carbon nanotubes,effective length of pencil lead,scanning potential range and enrichment time.Under optimal conditions,the decrease in DPV reduction peak current of potassium ferricyanide is proportional to the concentration of chlorpyramide in the range of 0.75-1.75 μ mol/L,the detection limit is 4.20×10-2 μ mol/L,and the substances that may coexist in the chloropyramide system do not interfere with the determination.The results of this method are in agreement with those of LC-MS.
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