中药质量除了自身的有效成分、有毒成分、含量明确且稳定可控外，中药中残留农药和重金属对中药质量的影响也不可忽视。
The quality of Chinese herbs was not only including the effective constituent, toxicant and content but also the heavy metals and pesticide residue.
长残留除草剂在我国使用面积迅速扩大，造成后茬作物受害事件时有发生，已成为一个不容忽视的问题。
The application area of long residue herbicides expands rapidly in our country, and make it a serious problem about the carryover to the subsequent crops.
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