Control chart. A laboratory monitoring perchlorate in urine measured quality control samples made from synthetic urine spiked with. The graph shows consecutive quality control measurements. Are any troubleshooting conditions from Box 5-1 observed in these data?

Control chart for ClO-4 in urine. [Data from L. Valentin-Blasini, J. P. Mauldin, D. Maple, and B. C. Blount, "Analysis of Perchlorate in Human Urine Using Ion Chromatography and Electrospray Tandem Mass Spectrometry," Anal. Chem. 2005, 77, 2475.

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6.0 5.5 Action line Warning line Warning line Action line 4.5F 4.0 Analysis date