Recently, Taiwan conforms aqua regia digestion to regulate the control standard of heavy metal content in soil.However, this method cannot directly reflect the threat to environment by heavy metals.

• 目前台湾对于土壤重金属含量管制标准是以王水消化法所得重金属总量为依据，然而此方法并不能直接反映出重金属对环境之危害。