制备了ITO/Gr/CH₃NH₃PbI₃/CS/GOx电极，将制得的电极浸入5.0 mL的0.1 mol·L^-1 PBS （pH 7.0）中，加入丁草胺标准溶液，保持10 min，然后将电极取出插入含有0.8 mmol·L^-1葡萄糖的0.1 mol·L^-1 PBS （pH 7.0）中，测量光电流（I）。另做空白试验（操作同上，但不存在丁草胺），测量光电流（I₀）。由（I₀-I）/I₀×100计算丁草胺对光电流的抑制率。结果表明，抑制率与丁草胺的浓度在0.02~10.0 nmol·L^-1内呈线性关系，检出限（3S/N）为0.005 nmol·L^-1。方法用于测定蔬菜和水果空白加标样品中的丁草胺，测定值与气相色谱-质谱法的测定结果一致，测定值的相对标准偏差（n=6）在1.8%~4.7%之间，加标回收率在93.3%~102%之间。

The electrode of ITO/Gr/CH₃NH₃PbI₃/CS/GOx was prepared. The obtained electrode was immersed into 5.0 mL of 0.1 mol·L^-1 PBS (pH 7.0), and butachlor solution was added. After keeping for 10 min, the electrode was taken out and immersed into 0.1 mol·L^-1 PBS (pH 7.0) containing 0.8 mmol·L^-1 gluocose, and the photoelectric current (I) was measured. A blank test was done in the same way as mentioned above but in absence of butachlor, and the photoelectric current (I₀) was measured. Inhibition rate of photoelectric current by butachlor was calculated from (I₀-I)/I₀×100. The results showed that inhibition rate was linear with the concentration of butachlor in the range of 0.02-10.0 nmol·L^-1, and the detection limit (3S/N) was 0.005 nmol·L^-1. The method was applied to determination of butachlor in spiked blank samples of vegetables and fruits, giving measured values consistent with those obtained by gas chromatography-mass spectrometry, and RSDs (n=6) between 1.8% and 4.7%. Recovery obtained by standard addition method were in the range of 93.3%-102%.