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BIOCHEMICAL OXYGEN DEMAND BY SKALAR (PERFORMANCE CHARACTERISTICS OF THE…
BIOCHEMICAL OXYGEN DEMAND BY SKALAR
PERFORMANCE CHARACTERISTICS OF THE METHOD
SUBSTANCE DETERMINED
TOTAL BOD - 00899, 00852; FILTERED BOD - 00897, 00832; SETTLED BOD - 00898,00842
TYPE OF SAMPLE
BASIS OF THE METHOD
RANGE OF APPLICATION
THE RANGE IS EXTENDED BY APPROPRIATE DILUTION
CALIBRATION CURVE
STANDARD DEVIATION
SENSITIVITY
BIAS
INTERFERENCE
TIME REQUIRED FOR ANALYSIS
METHOD SUITABILITY
PRECISION TEST DATA
SAMPLE TYPE
TAP WATER - BLANK
LOW STANDARD
HIGH STANDARD
AQC
GREAT BILLING, BRAMPTON, ELY LOW SPIKE
GREAT BILLING, BRAMPTON, ELY HIGH SPIKE
GREAT BILLING, BRAMPTON, ELY
TARGET
MEAN
SENSITIVITY
BIAS
MEAN RECOVERY
REAGENTS
WATER
PREPARATION OF STOCK REAGENT SOLUTION
STABLE FOR THREE MONTHS
WORKING AQC SOLUTION
SHELF LIFE OF 1 DAY
BRAMPTON FINAL EFFLUENT
SHELF LIFE OF 1 WEEK FROM DATE OF COLLECTION
STOCK AQC SOLUTION
SHELF LIFE OF 1 DAY
BRAMPTON FINAL EFFLUENT FOR MATRIX MATCHED AQC
PREPARATION OF DILUTION WATER
CALIBRATION WATER
DILUTION WATER
TO BE MADE UP IMMEDIATELY PRIOR TO THE BATCH GOING ON
REAGENTS USED DURING THE TITRIMETRIC DETERMINATION OF DISSOLVED OXYGEN CONCENTRATION AND CHECKING METER CALIBRATION
REAGENTS USED FOR ZERO POINT CALIBRATION
75% CALIBRATION CHECK
STOCK SOLUTION
WORKING SOLUTION
BRAMPTON FINAL EFFLUENT
APPARATUS
CLEANLINESS OF APPARATUS
PIPETTES USED MUST BE CALIBRATED DAILY PRIOR TO ANALYSIS
SAMPLE COLLECTION AND PRESERVATION
TAKEN IN FOOD GRADE PET
ANALYSIS COMMENCED AS SOON AS POSSIBLE AFTER SAMPLE RECEIPT
REGULATORY SAMPLES SUBBED INTO A 'JUICE BOTTLE' AND PLACED IN THE FREEZER IMMEDIATELY AFTER REGISTRATION
SAMPLE PRE-TREATMENT
SOME SAMPLES REQUIRE ANALYSIS OF THE SETTLED OR FILTERED SAMPLE
ANALYTICAL PROCEDURE
DISSOLVED OXYGEN TITRATIONS
CALIBRATION OF DO PROBES ON ROBOTS 3,4 AND 5
PLACE TWO BOD BOTTLES, CONTAINING AERATED DI WATER IN POSITIONS 1 AND 2 OF A BOD TRAY,PLACED IN TRAY POSITION 1
IF THE MG/L READINGS ARE NOT WITHIN +/- 5% OF THE TIRE MEAN IT MAY BE NECESSARY TO SERVICE THE PROBES. (SEE MAINTENANCE NOTES AND METHOD LOG)
SAMPLE ANALYSIS
1)IN WORKSHEET PRODUCTION, SELECT GROUP CODE 3R AND ENTER THE APPROPRIATE SAMPLE NUMBERS
2)PRESS AUTO-RUN EXTRACTION-MAKE A NOT E OF THE WORK SHEET NUMBER CLOSE
3)CRETE A COMPOSITE WORKSHEET WITH THE AUTO WORKSHEET NUMBER PRODUCED
4) IN LOCAL WORKSTATION SYSTEMS, SELECT SKALAR BOD , ENTER THE AUTO WORKSHEET NUMBER TICK/UNTICK SP2000 DEPENDING ON WHICH ROBOT YOU REQUIRE AND PRESS SEND, PRINT WORKSHEETS CREATED
SEND THE DAYS WORKSHEETS ACROSS TO THE BOD ANALYSIS ROBOTS READY FOR ANALYSIS
5) AQUA CHECKS IF AQUA CHECKS ARE TO BE INCLUDED ON THE WORKSHEET ENSURE THE GREEN TICK IS VISIBLE
6) SELECT VOLUME OF SAMPLE REQUIRED SUGGESTED DILUTIONS CHART SHOULD ALSO BE USED ALONG WITH VISUAL CHECKS AND SAMPLE HISTORY WHEN MAKING DILUTION ESTIMATIONS
THE DILUTION REQUIRED DEPENDS ON THE EXPECTED BOD LEVEL, WHICH SHOULD BE 30-70% OF THE INITIAL OXYGEN CONCENTRATION IS DEPLETED OVER 5 DAYS AT 20 DEGREE C.
THE ACTUAL VOLUME USED SHOULD BE BASED ON A FINAL DILUTED SAMPLE VOLUME OF 283 ML
SAMPLES THAT ARE VISUALLY DIFFERENT FROM WHAT IS EXPECTED ARE ANALYSED AT LEAST 2 DIFFERENT DILUTIONS TO ENSURE COVERAGE OF RANGE.
SAMPLE VOLUMES MUST BE RECORDED IN THE VOLUME COLUMN OF THE PRINTED WORKSHEET
ANALYTICAL QUALITY CONTROL
ONE SPIKED SAMPLE PER BOD TRAY
WORKING AQC SOLUTION
ONE UNSPIKED SAMPLE PER TRAY
BRAMPTON FINAL EFFLUENT
TWO BLANK BOD SAMPLES ON EACH TRAY OF 18 SAMPLES
ONE IN ODD POSITION ONE IN EVEN POSITION
THE MEAN OF THE FINAL DISSOLVED CONCENTRATIONS OF THE BLANK SAMPLES ARE USED IN THE CALCULATION
MINIMUM OF ONE AQC PER 10 SAMPLES AND ALSO ONE AT BEGINNING AND END OF EACH BATCH
PLACE PREPARED BATCH OF SAMPLES ONTO THE ROBOT, IN THE WORKSHEET ORDER WORKING FROM TOP TO BOTTOM AND CONTINUING FROM LEFT TO RIGHT
SP1000 HAS A MAXIMUM OF 90 SAMPLES PER RUN;SP2000 HAS A MAXIMUM OF 144 SAMPLES
SEEDED WATER
LOADING WORKSHEETS TO ROBOTS
1)CLICK NEW CLICK BOD ENTER THE NAME OF THE WORKSHEET IN DESCRIPTION AND CLICK CONTINUE
2)DRAG THE REQUIRED NUMBER OF TRAYS FROM AVAILABLE RACKS TO THE CORRECT POSITION IN ANALYSER
3)IMPORT
4)BROWSE
SELECT CORRECT WORKSHEET
ENTER THE VOLUMES FOR ALL SAMPLES IN THE VOLUME COLUMN (283 ML FOR BLANKS AND WASH) AND CHANGE SAMPLE TYPE FOR BLANKS TO BLANK IN THE TYPE COLUMN
UNTICK ANY POSITIONS THAT DO NOT REQUIRE ANALYSIS IN THE "Y/N" COLUMN
INCUBATION
TRANSFERRING DAY 1 TO AQ WINDOWS
CLICK PRINT SAMPLES AND PRINT ALL DAY 1 DO READING CHECK VOLUMES OF BLANKS, AQCS AND ALL SAMPLES
CLICK EXPORT SAVE AS USING WORKSHEET NUMBER ADD .BOD AT THE END
IMPORT TO AQ WINDOWS
SELECT SKALAR BOD RECEIVE SELECT WORKSHEET DATA FILE
RECORD ON THE WORKSHEET TIME THAT SAMPLES ARE PUT IN AND REMOVED FROM INCUBATOR
RECORD INCUBATOR TEMPERATURE DAILY
CHECK ALL DAY 1 SAMPLES HAVE DO READINGS AND TEMPERATURES PRIOR TO INCUBATION
ANY SAMPLE WITH A DO READING <8MG/L MUST BE INVESTIGATED
ANY SAMPLE WITH A DO READING OF 10 MG/L OR MORE
CHECK THE TEMPERATURES ARE SIMILAR THROUGHOUT THE RUN
IF MORE THAN 1 OR 2 SAMPLES ARE VERY LOW OR VERY HIGH OR THE TEMPERATURES ARE VERY DIFFERENT
RE CALIBRATE ROBOT AND RERUN SAMPLES
CHECK READINGS BY RUNNING ON OTHER ROBOT
MEMBRANE HEADS ARE DAMAGED AND NEED CHANGING
SAMPLE DISPOSAL
ON COMPLETION OF ANALYSIS RETAIN THE MEASURED SAMPLES UNTIL THE RESULTS HAVE BEEN CALCULATED AND CHECKED AS BEING WITHIN THE NORMAL EXPECTED RANGE
CHECK ALL BOTTLES READ CORRECTLY AND ALL READINGS ARE PRESENT
A REPEAT SHEET WILL BE PRODUCED WITH ANY RESULTS THAT HAVE STRIPPED OR ARE OVER DILUTED
PRINT THIS LIST AND INCLUDE WITH WORKSHEET
REPEAT USING DEFROSTED SUB SAMPLE
CALCULATION OF RESULTS
BOD MG O2 /L=DILUTION FACTOR((INITIAL SAMPLE DO-FINAL SAMPLE DO)-(((DILUTION FACTOR-1)/DILUTION FACTOR)XINITIAL BLANK DO - FINAL BLANK DO)
ROUTINE MAINTENANACE
ZERO CALIBRATION
FIRST THURSDAY OF EACH MONTH BEFORE ROUTINE WEEKLY MAINTENANCE
75% CALIBRATION CHECK
QUATERLY