Performance Verification Statement for the Xylem EXO 2 pH Sensor

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Ref. No. [UMCES] CBL 2015-014
ACT VS15-07
2
TABLE OF CONTENTS
EXECUTIVE SUMMARY ............................................................................................3
BACKGROUND AND OBJECTIVES ...........................................................................5
INSTRUMENT TECHNOLOGY TESTED ....................................................................6
PH SCALES.................................................................................................................6
SUMMARY OF VERIFICATION PROTOCOLS ...........................................................7
ANALYSIS OF REFERENCE SAMPLES ............................................................................................ 8
LABORATORY TEST...................................................................................................................... 8
FIELD TESTS .............................................................................................................................. 10
RESULTS OF LABORATORY TEST .........................................................................15
RESULTS OF MOORED FIELD TESTS.....................................................................30
QUALITY ASSURANCE/QUALITY CONTROL ........................................................58
QUALITY CONTROL SAMPLES...................................................................................................... 58
EXTERNAL QUALITY ASSURANCE AND QUALITY CONTROL ASSESSMENTS ................................ 61
REFERENCES...........................................................................................................63
ACKNOWLEDGEMENTS .........................................................................................65
APPENDIX I..............................................................................................................66
APPENDIX II ............................................................................................................73