Conversion film: chemical or metal electrochemical treatment by the formation of the contains the metal surface membrane layer of the compounds.
转化膜：对金属进行化学或电化学处理所形成的含有该金属之化合物的表面膜层。
2
The membrane coated with enzyme of plant origin or other chemicalcompounds has been prepared for the extraction of trace organophosphorus pesticides and their intermediates in water.