GE MOA 280i - Page 11

GE Analytical Instruments ©2006 DLM 14291 Rev. A
xi
A
DJUSTMENT OF LIQUID LEVEL......................................................................................................................... 12-3
Preparation of Stock Solution............................................................................................................ 12-5
Preparation of Dilute Standards....................................................................................................... 12-7
WATER BLANKS .............................................................................................................................................. 12-8
INJECTION TECHNIQUE .................................................................................................................................... 12-9
PREPARATION OF CALIBRATION CURVE ............................................................................................................. 12-9
LINEAR RANGE AND OFF-SCALE PEAKS.............................................................................................................. 12-9
REPEATABILITY ............................................................................................................................................. 12-10
NITRITE CONTAMINATION .............................................................................................................................. 12-10
SAMPLE ANALYSIS ......................................................................................................................................... 12-12
BACKGROUND NITRITE................................................................................................................................... 12-12
REPLACING THE REDUCING AGENT AND OPENING THE PURGE VESSEL ............................................................... 12-13
SEPTUM REPLACEMENT.................................................................................................................................. 12-14
CLEANING THE PURGE VESSEL........................................................................................................................ 12-14
CLEANING OF THE IFD FILTER ....................................................................................................................... 12-16
LONG-TERM MAINTENANCE OF THE PURGE VESSEL AND BUBBLER........................................................................ 12-16
13. MEASUREMENT OF NITRATE, NITRITE AND NITRIC OXIDE IN LIQUID SAMPLES................. 13-1
APPARATUS FOR NITRATE REDUCTION .............................................................................................................. 13-1
Preparation of the Nitrate Reducing Agent.................................................................................... 13-2
Preparation of 1M NaOH..................................................................................................................... 13-2
Startup Procedures for Nitrate Reduction...................................................................................... 13-3
ADJUSTMENT OF PURGE GAS FLOW RATE......................................................................................................... 13-4
LEAK CHECK FOR PURGE VESSEL...................................................................................................................... 13-5
ADJUSTMENT OF LIQUID LEVEL......................................................................................................................... 13-5
Preparation of Stock Solution............................................................................................................ 13-6
Preparation of Dilute Standards....................................................................................................... 13-7
WATER BLANKS .............................................................................................................................................. 13-9
INJECTION TECHNIQUE .................................................................................................................................... 13-9
PREPARATION OF CALIBRATION CURVE ........................................................................................................... 13-10
ANALYSIS OF SAMPLES AND STANDARDS........................................................................................................... 13-10
Serum and Plasma Samples.............................................................................................................. 13-10
NITRATE CONTAMINATION ............................................................................................................................. 13-11
REPLACING THE REDUCING AGENT AND OPENING THE PURGE VESSEL ............................................................... 13-11
OPENING THE GAS BUBBLER .......................................................................................................................... 13-12
SEPTUM REPLACEMENT.................................................................................................................................. 13-13
CLEANING THE PURGE VESSEL........................................................................................................................ 13-13