Fear of shark attacks keeps us onshore, and trace amounts of chemicals in our water supply terrify us - though the chance of harm may be slight.

担心鲨鱼的攻击而呆在岸上，我们日常用水中标出的化学成分含量也让我们害怕——尽管有害的可能性十分微小。

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A dynamic model on interaction between water particles and trace organic chemicals was presented on the basis of the research of adsorption, hydrolysis, biodegradation and algae accumulation in water.

在颗粒物对水中邻苯二甲酸酯吸附、水解、生物降解和藻类富集实验的基础上，提出了颗粒物与天然水体中痕量有机物相互作用的动态数学模型。

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These have been used in laboratories (even by NASA) to detect trace chemicals, but they are now being applied to the food industry in the effort to monitor food at its most refined level.

FORBES: Magazine Article

Its invocation would provide crusading NGOs, bloggers and activist journalists with an unchecked justification for rejecting almost any processed food, especially those made using genetic modification or where trace chemicals can be found in food packaging.

FORBES: The Politics of Obesity: Here Comes the NGO -- Media -- Class Action Bar Complex

Dr Sharma said the new seed has no trace of any of the natural chemicals which cause a narcotic effect - namely, morphine, codeine and narcotine.

BBC: Addictive-free poppy seed developed