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生态环境监测机构开展方法验证是进行资质认定、扩项或标准方法变更时的前提和条件。本文从《生态环境监测机构资质认定方法 验证通用技术指南》中对方法验证过程的规定要求出发,结合实际应用,对方法验证过程进行了理解阐述,主要介绍了其适用范围、方法验证的基本条件、方法性能指标验证、实际样品测定、方法验证报告及记录编制等,以便从业人员正确、规范开展新标准方法验证工作,确保方法验证工作的质量以及提高验证效率。
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| 性能指标 | 验证方式 | 要求 |
| 校准曲线 | 在方法规定范围内选取校准曲线各浓度点按照标准方法绘制曲线, 验 证得到的相关系数、斜率、相对响应因子的相对标准偏差等相关参数。 | 相关系数、斜率或相对响应因子的相对标准偏差等相关参 数应满足标准要求。若标准方法未规定校准曲线相关要求, 校准曲线相关系数应不低于 0.995。 |
| 检出限和测 定下限 | 优先选择标准方法编制说明的方式验证方法的检出限。如无法获取编 制说明, 按照 HJ 168 附录 A.1 的方法验证检出限。一般情况下, 按 照 HJ 168 规定以 4 倍检出限作为测定下限。 | 验证得到的检出限和测定下限应不高于标准方法规定的检 出限和测定下限。 |
| 精密度 | 至少选择一个有检出的实际样品或采用实际样品加标的方式进行精密 度验证,验证过程覆盖前处理等整个监测流程(不能采用有证标准物 质进行验证), 标准方法所有适用范围的基质类型均需验证。当采用 实际样品加标方式进行验证时,加标过程应尽可能在监测过程最前端。 | 采用对同一样品在重复性测量条件下测定至少 6 次的相对 标准偏差评价精密度。验证所得结果应符合标准方法实验 室内相对标准偏差的相关要求或小于等于标准方法中近似 浓度水平样品的实验室内相对标准偏差最大值。 |
| 正确度 | 当采用有证标准样品验证时,在标准方法适用范围内的每个基质类型 中, 至少选择一个有证标准样品 (或质控样品) 进行方法正确度验证, 重复性测定次数应至少 3 次。 | 有证标准样品或质控样品测定结果应均在不确定度范围内, 或符合标准方法误差或相对误差的要求。 |
| 当采用实际样品加标回收率验证时, 在标准方法适用范围内的每个基 质类型中, 至少选择一个实际样品进行方法正确度验证, 重复性测定 次数应至少 3 次。 | 加标回收率的测定结果均应符合标准方法质量保证和质量 控制中回收率的要求,或符合回收率最终值范围的要求。 |
), ArticleFig(id=1156979653467529288, tenantId=1146029695717560320, journalId=1146119944283992078, articleId=1149790677732647455, language=CN, label=表 1, caption=
方法性能指标验证方式及要求, figureFileSmall=null, figureFileBig=null, tableContent=
| 性能指标 | 验证方式 | 要求 |
| 校准曲线 | 在方法规定范围内选取校准曲线各浓度点按照标准方法绘制曲线, 验 证得到的相关系数、斜率、相对响应因子的相对标准偏差等相关参数。 | 相关系数、斜率或相对响应因子的相对标准偏差等相关参 数应满足标准要求。若标准方法未规定校准曲线相关要求, 校准曲线相关系数应不低于 0.995。 |
| 检出限和测 定下限 | 优先选择标准方法编制说明的方式验证方法的检出限。如无法获取编 制说明, 按照 HJ 168 附录 A.1 的方法验证检出限。一般情况下, 按 照 HJ 168 规定以 4 倍检出限作为测定下限。 | 验证得到的检出限和测定下限应不高于标准方法规定的检 出限和测定下限。 |
| 精密度 | 至少选择一个有检出的实际样品或采用实际样品加标的方式进行精密 度验证,验证过程覆盖前处理等整个监测流程(不能采用有证标准物 质进行验证), 标准方法所有适用范围的基质类型均需验证。当采用 实际样品加标方式进行验证时,加标过程应尽可能在监测过程最前端。 | 采用对同一样品在重复性测量条件下测定至少 6 次的相对 标准偏差评价精密度。验证所得结果应符合标准方法实验 室内相对标准偏差的相关要求或小于等于标准方法中近似 浓度水平样品的实验室内相对标准偏差最大值。 |
| 正确度 | 当采用有证标准样品验证时,在标准方法适用范围内的每个基质类型 中, 至少选择一个有证标准样品 (或质控样品) 进行方法正确度验证, 重复性测定次数应至少 3 次。 | 有证标准样品或质控样品测定结果应均在不确定度范围内, 或符合标准方法误差或相对误差的要求。 |
| 当采用实际样品加标回收率验证时, 在标准方法适用范围内的每个基 质类型中, 至少选择一个实际样品进行方法正确度验证, 重复性测定 次数应至少 3 次。 | 加标回收率的测定结果均应符合标准方法质量保证和质量 控制中回收率的要求,或符合回收率最终值范围的要求。 |
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