Continuing calibration verification.作用：verify freedom from excessive instrumental drift.注释：analyte concentration near mid-range of calibration line must be analyzed before and after all sample digestates/extracts, and at a frequency not less than once every ten samples measured value within one known range.简单来说就是做一个标准溶液中间浓度的一个点，根据结果来判断仪器是否漂移。
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