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o Out of Control Situations <br /> There are a number of conditions that could constitute an "out of <br /> control" situation for an instrument, an analysis. or a method. <br /> a Out of Control Situations for Instrunentsa <br /> ror instruments, these are usually mechanical or electronic <br /> 1 problems that require either maintenance or repair. In such <br /> cases, logical troubleshooting steps, as detailed in specific <br /> instrument SOP's or manuals, are undertaken to isolate the <br /> problem, and correction is done by either GHEMUCST staff or <br /> outside vendors trained in instrument maintenance or repair. <br /> 1 o Out of Control Situations for an Rnalysise <br /> ror a particular analysis, out of control conditions arise when <br /> tuning standards, calibration standards, internal standards, or <br /> surrogates fail to meet method specific acceptance criteria . <br /> Each specific method SOP includes steps to follow for the <br /> 1 resolution of these conditions, and they include, but are not <br /> limited to, the fallowing general actions, as appropriate . <br /> o Tuning Standards <br /> a Check that all instrument parameters are correct: <br /> u Re-analyze at least twice: <br /> o Make up new standard solutions: <br /> o Re-tune. <br /> o Calibration Standards/Internal Standards <br /> a Check that all instrument parameters are correct. <br /> o Reanalyze at least twice; <br /> o Perform instrument specific maintenance; <br /> o Generate new calibration data; <br /> o Prepare new calibratLan standards . <br /> o Surrogates <br /> o Check that all instrument parameters are correct% <br /> o Check for possible matrix interference with internal <br /> standard rheas, if applicable; <br /> 26 <br /> i <br />