| 摘要 |
A marking agent is provided having improved persistency in the environment. Labeling agents capable of detection is the gas phase are microencapsulated in such a fasion that sensible portions thereof are incorporated into the cell wall structure of the microcapsules and immobilized thereby. Subsequent heating of such microcapsules facilitates the liberation of the agents thus immobilized and provides a source of labeling agent which survives long exposure in the environment. According to a preferred embodiment, olfactory marking agents are provided which employ polyfunctional mercaptans as the microencapsulated species. Application of these marking agents to crops contaminated with herbicide to avoid exposure to humans is disclosed. |
