Establishing Analytical Performance Criteria for the Global Reconnaissance of Antibiotics and Other Pharmaceutical Residues in the Aquatic Environment Using Liquid Chromatography-Tandem Mass Spectrometry

Table 6

Results of the application of the ion ratio criterion in real wastewater and surface water samples.

Matrix	Tolerance range	Total no. of detections	No. of detections outside the range
Influent	±40%	102	0
Effluent	±30%	90	2
Downstream	±30%	37	2
Upstream	±30%	39	1

A number of detections outside the range are data points that were considered positive detections but had ion ratios outside the set tolerance range.