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Standard Operating Procedures
At www.dep.state.fl.us/labs/qa/sops.htm
Call for help at• 407-893-3313 Orlando Office• 850-488-2796 Tallahassee
Chapters of Interest
FS2400 Wastewater Sampling FT1000 Field Testing General FT1100 Field pH FT1400 Temperature FT1500 Field Dissolved Oxygen FT1600 Field Turbidity FT1900 Continuous Monitoring FT2000 Field Chlorine (TRC)
Calibration Field pHFT1100
Quarterly• And the good news, THERE ARE NO
QUARTERLY CALIBRATION REQUIREMENTS FOR pH
Monthly• and for more good news, THERE ARE
NO MONTHLY CALIBRATION REQUIREMENTS FOR pH
Calibration of pH meter
Weekly - Cannot be done with all meters, calibrate and check meter’s % slope.
Should be 90% or greater Record date, time , analyst,
ph buffer readings after calibration, buffer lot # , buffer expiration date, temperature, and slope
Daily Calibration
Calibrate with at least 2 buffers
Use 7 buffer first then 4 or 10
Second buffer will bracken most samples
For meters using 2 point calibration, use third buffer as check
Field Calibration
In the field, as minimum, check meter with 7 buffer.
Record readings Return from the field as minimum,
check meter with 7 buffer No more than 0.2 pH units off
from standard
Continuous pH meter calibration
Perform an initial calibration• before installation• whenever taken off-line• after failed QC check
Daily checks• compare pH of grab sample taken at
same location as in-line monitor• grab sample pH measured with
calibrated meter
Document, Document, Document
If its not written down you did not do it!
Date and time Analyst Reading from continuous meter Reading from calibrated meter No more than 0.2 pH units different
than calibrated meter reading
TemperatureFT1400
Variety of thermometers for field• capable of reading 0.1 degree Celsius
Laboratory thermometer• NIST-traceable reading 0.1• degree Celsius
Temperature Calibration
• Temperature should agree within 0.1
degree Celsius
• Keep records of checks and sample
measurements
TurbidityFT1600
Meter specifications are in
EPA Method 180.1 or
FT1600 Daily Checks Quarterly Checks
Quarterly Calibration
Used to validate the secondary standards Use properly calibrated nephelometer Use primary standard for each range of
secondary standard Refer to FT1600 3.2 for acceptable limits
for secondary standards This calibrates the secondary standards
Daily Calibration
Used for assurance meter is operating properly
Check each range with primary or secondary standard
Refer to FT1600 3.2 for acceptable limits for secondary standards
Record Keeping
Type of standards and concentrations
Date, Time, Analyst result of each check Lot # and expiration date for
all bought standards Lot # and expiration date for all bought reagents
IN-line Turbidity Calibration
Initial calibration• Before installation• when taken off-line• when fails QC criteria
Daily Check• grab sample, measure with
calibrated meter and compare
In-line Turbidity
write it down!!• date, time, analyst• reading from in-line meter
and other meter• should be no more than 20 %
difference• use caution with very low
readings
Total Residual ChlorineFT2000
DEP recommends using DPD colorimetric method for concentrations between 0.2 and 4.0 mg/L
DEP does not recommend equipment
Can’t use gel stds for <0.5 requirements
Color wheel comparison kits are unacceptable
Quarterly Calibration
Used to calibrate/check the meter
Meter is checked with primary standards
At least one standard for each range
Refer to FT2011 for acceptable limits for primary standards
Can be performed by a laboratory certified in residual chlorine or Class A or B operator
Quarterly Paperwork
If you took the time to do it, be able to prove it!!!
Date, time, analyst Lot # and expiration date of
chemicals used True value of standard and
meter reading
Monthly Calibration
Used to validate the secondary standards Use properly calibrated meter Use primary standard for each range of
secondary standard Refer to FT2011 for acceptable limits for
secondary standards This validates the secondary standards Can be performed by a laboratory certified in
residual chlorine or Class A or B operator
Monthly paperwork
when you write it down you make me so happy!!!
Date, time, analyst Lot # and expiration date of
standards used True value of standard and
meter reading
Daily Calibration
Commercial secondary standards or primary standards
Zero with blank Read the other three standards Date, time, analyst Lot # and expiration date of standards
used True value of standard and meter
reading