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水中硝酸盐氮是评价水体污染的重要指标，误差的预评价是实验室内部分析质量控制的重要环节。要使实验室能提供有效的数据，必须在分析前对分析方法的误差作一个全面评价，即精密度、偏性分析质量控制试验。通过该试验可以了解该方法在实验过程中误差的来源和大小，并采取措施
Nitrate nitrogen in water is an important index to evaluate water pollution. The pre-evaluation of error is an important link in the quality control of laboratory internal analysis. For laboratories to provide valid data, a comprehensive evaluation of the analytical method errors must be made prior to analysis, namely, precision and bias analysis quality control tests. Through this test, we can know the source and size of the error during the experiment and take measures