But it takes a little time before the metals dumped into the soil reach the point where they do harm to plants and animals, including man. The process of accumulation is not visible, as it is in water, so soil pollution does not seem to get the attention that water and air pollution get, and always seems to take a back seat in environmental protection work.
只不過，重金屬透過土壤累積到對作物與人體造成傷害，需要一段時間，累積過程又不似水汙染肉眼可見，土壤汙染也就不如水、空氣汙染受到重視，而在環保工作中敬陪末座了。