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Analyze-Immediately Parameters. pH. Analyze Immediately. Within 15 minutes of collection: pH Residual Chlorine Temperature Chlorine Dioxide Dissolved Oxygen (probe) Sulfite note sample collection & analysis times!!!. Topics covered today:. pH Temperature Dissolved Oxygen (DO)

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analyze immediately
Analyze Immediately

Within 15 minutes of collection:

  • pH
  • Residual Chlorine
  • Temperature
  • Chlorine Dioxide
  • Dissolved Oxygen (probe)
  • Sulfite

note sample collection & analysis times!!!

topics covered today
Topics covered today:
  • pH
  • Temperature
  • Dissolved Oxygen (DO)
  • Residual Chlorine (TRC or CPO)….
ph what we will cover
pH: what we will cover….
  • Significance of pH. (data quality)
  • Points to Remember.
  • Lab Chemicals.
  • Good Lab Practices (GLP).
  • Review NJAC Regs. as they pertain to the recording & reporting

of data.

what exactly is ph
What exactly is pH???
  • Negative log of Hydrogen ion activity.
  • pH above 7: alkaline or basic.
  • pH below 7: acidic.
  • pH = 7 is considered neutral.
  • Di-ionized water saturated with CO2 has pH = 5.65
data quality a piece a cake
Data Quality : “a piece a cake!”
  • Properly working instrument & clean apparatus.
  • Fresh buffers and reagent rinse water.
  • Hold times met.
  • Correctly calibrated.
  • Proper sample handling.
  • GLP
data quality calibration
Data Quality: Calibration

Grab:

  • Daily, within 3 hrs. of sample analysis.
  • 2 buffers, bracketed.
  • Mid-range check.
  • Record time, concentration and actual reading of each.
  • For initial calibration, reading must be +/- 0.05 of true value.
  • Recalibrate if difference is greater than +/- 0.2 (applies to 3 hr. check).
  • Discard pH buffer aliquots after each use.
data quality calibration1
Data Quality: Calibration

Continuous:

  • Weekly, unless otherwise stated by SA.
  • Indirect Calibration - basically a grab (as close to electrode as possible); measure within 15 minutes with lab pH meter; compare readings of continuous monitor with lab pH meter. Record info in logbook, sign & date.
  • Direct Calibration (as in grab procedure). - accurate to 0.1, per method (SM 4500-H B).
  • Record time, concentration and actual reading of each.
  • Discard pH buffer aliquots after each use.
make sure
Make sure…….
  • Grab pH: meter in good working order (field or hand-held models vs.lab or bench-top models).
  • Continuous monitor: keep probe clean.
  • Calibrate as per method.
  • Maintain calibration & sample collection log.
  • Maintain field data

notebook.

make sure continued
Make Sure (continued)-
  • Discard buffers IMMEDIATELY following use - DO NOT re-use!
  • Discard expired buffers!
  • Electrode is OK - not damaged.
  • Stir or swish sample during measurement.
  • Record time of analysis.
make sure continued1
Make Sure (continued)-
  • Meters must have accuracy of +/- 0.05 and +/- 0.05 resolution
  • ...since pH is temperature-dependent
  • Must be temperature-compensated…
  • or use stand-alone thermometer…
lab chemicals
Lab Chemicals…...
  • FRESH buffers! (purchase ready-made or make yourself).
  • Reagent water.
  • Electrode filling solution (if necessary).
hold times
Hold Times
  • Pertains to grab pH and indirect calibration for continuous measurement.
  • 0 - 15 minutes - note time of collection & time of analysis!
good lab practices glp
Good Lab Practices (GLP)
  • Data signed, initialed & dated.
  • Instrument ID & serial number
  • NO pencil!
  • NO white-out!
  • Single-line, date & initial all errors.
analyze immediately parameters records
Analyze-Immediately parameters Records
  • NJAC 7:18-8.5 - This section pertains specifically to Analyze-Immediately parameters…
  • GENERAL: retain raw data records, quality control data records, chain-of-custody forms, laboratory reports…
  • Storage of data - data must be filed & maintained in an accessible location on lab premises for 1 year after analysis date…
  • Long-term storage: records of analysis must be stored for 5 years after analysis date.
retain as records of analysis
Retain as Records of Analysis
  • Assigned lab ID # or other form of ID
  • date & time of analysis
  • name & signature of person(s) who collected sample
  • name & signature of person(s) who analyzed sample
  • type of analysis performed & DSAM* used

(*DSAM=Dept. Sanctioned Analytical Method)

  • results of analysis & raw data generated from analysis
reporting results
Reporting Results
  • Certified environmental lab name & NJ lab ID number
  • date, time & location of sample collection and sample analysis
  • type of analysis performed and analytical method employed
  • results from analysis
  • name & signature of environmental lab manager or designee per NJ regulations (NJAC 7:18-2.11(a)1iii)
summary
Summary
  • Don’t underestimate the importance of pH.
  • Adhere to NJAC Regulations and approved method.
  • Document-document-document!!!
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