National Water-Quality Assessment Project replicate surface water and groundwater pesticide data analyzed by the USGS National Water Quality Laboratory schedule 2437, Water Years 2013-15.

Replicate water-quality samples are collected and prepared in the field and analyzed in the laboratory in identical ways so that they are considered to be the same in...平行水质样本于野外完成采集与制备，并在实验室以完全一致的流程开展分析，因此此类样本被视为在……方面保持一致。