一、平行样

平行样又称平行双样，是指在环境监测和样品分析中，只包括两个相同子样的样品。

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二、平行试验

平行试验就是同一批号（炉号等）取两个以上相同的样品，以完全一致的条件（包括温度、湿度、仪器、试剂，以及试验人）进行试验，看其结果的一致性，两样品间的误差是有国标或其他标准要求的。其优点是防止偶然误差的产生。

三、精密度控制

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YONGDUOCIPINGXINGCEDINGJIEGUOJINXINGXIANGDUIPIANCHAJISUANDEJISUANSHI：

式中：x i —某一测量值；

    x — DUOCICELIANGZHIDEJUNZHI。

   n—CELIANGCISHU

YIZUCELIANGZHIDEJINGMIDUYONGBIAOZHUNPIANCHAHUOXIANGDUIBIAOZHUNPIANCHABIAOSHISHIDEJISUANSHI：

废水监测部分项目精密度控制指标

转自：环境监测实战，侵删。