Transcript
Did ya’ know?
By Dave Johnson Muskegon County Wastewater Management System
If your lab uses Standard Methods Online edition, you’re golden.
Fecal Coliform (MPN)
Fecal Coliform (mFC)
Ammonia
BOD/CBOD
pH
Residual Chlorine
DO
TSS/VSS
Temperature
Hardness
Total Phosphorus
COD
Oil and Grease
Metals by Flame AA
Metals by GFAA
Metals By ICP
Metals by ICP-MS
Hg by CVAA
Total Cyanide
Total Phenols
www.standardmethods.org/ PDF/EPA_Acceptable_ Version_WW_6-20-2012 _final.pdf
Fecal Coliform (MPN)
Fecal Coliform (mFC)
Ammonia
BOD/CBOD
pH
Residual Chlorine
DO
TSS/VSS
Temperature
Hardness
Total Phosphorus
COD
Oil and Grease
Metals by Flame AA
Metals by GFAA
Metals By ICP
Metals by ICP-MS
Hg by CVAA
Total Cyanide
Total Phenols
Fecal Coliform (MPN)
Fecal Coliform (mFC)
Ammonia
BOD/CBOD
pH
Residual Chlorine
DO
TSS/VSS
Temperature
Hardness
Total Phosphorus
COD
Oil and Grease
Metals by Flame AA
Metals by GFAA
Metals By ICP
Metals by ICP-MS
Hg by CVAA
Total Cyanide
Total Phenols
Fecal Coliform (MPN)
Fecal Coliform (mFC)
Ammonia
BOD/CBOD
pH
Residual Chlorine
DO
TSS/VSS
Temperature
Hardness
Total Phosphorus
COD
Oil and Grease
Metals by Flame AA
Metals by GFAA
Metals By ICP
Metals by ICP-MS
Hg by CVAA
Total Cyanide
Total Phenols
Fecal Coliform (MPN)
Fecal Coliform (mFC)
Ammonia
BOD/CBOD
pH
Residual Chlorine
DO
TSS/VSS
Temperature
Hardness
Total Phosphorus
COD
Oil and Grease
Metals by Flame AA
Metals by GFAA
Metals By ICP
Metals by ICP-MS
Hg by CVAA
Total Cyanide
Total Phenols
New criterion for incubation time:
New criterion for incubation time:
5 Days ± 6 Hours
(Section 5, Part i)
New requirements for the Glucose-Glutamic Acid Check (GGA)
Set up THREE GGA samples. The average Measured BOD of the three samples must be 198 ± 30.5 mg/L
(Section 6, Part b)
Also, GGAs must be set up with nitrification inhibitor if your seed contains nitrifying bacteria.
(Section 6, Part b)
Different instructions for neutralizing the pH of samples that are too acidic or too basic.
Now samples must be neutralized if the pH falls outside the range of
6.0 – 8.0.
(Section 4, Part b, Item 1)
Now samples requiring pH adjustment must be adjusted into the range of 7.0 – 7.2.
(Section 4, Part b, Item 1)
6 7 8
6 7 8
6 7 8
6 7 8
Before you adjust the pH of a BOD sample, you must bring the temperature of the sample to 20 ± 3° C.
(Section 4, Part b, Item 1)
Different instructions for determining the detection limit for a sample.
For samples with NO SEED and NO DILUTION: The detection limit equals the detection limit of the DO measurement method. (i.e., around 0.1 mg/L)
(Section 8, Part b)
For samples with NO SEED but which ARE DILUTED: The detection limit equals 2 mg/L multiplied by the dilution factor.
(Section 8, Part b)
For samples which are SEEDED and DILUTED: The detection limit equals 2 mg/L minus the seed correction, multiplied by the dilution factor.
(Section 8, Part b)
For samples which are SEEDED and DILUTED, the actual text does not say to multiply by the dilution factor. That is an error in the text which has not yet been corrected.
For samples which are SEEDED but NOT DILUTED: The detection limit is 0 mg/L.
(Section 8, Part b)
DO by Winkler Titration
&
DO by Membrane Electrode
New Minimum QC Requirements
Sample Duplicate
(TABLE 4020:I. MINIMUM
QUALITY CONTROL FOR
METHODS IN PART 4000)
Zero Check with a Zero Oxygen Sample
(TABLE 4020:I. MINIMUM
QUALITY CONTROL FOR
METHODS IN PART 4000)
How do you prepare a Zero Oxygen Sample? SM gives a vague recipe:
“Add excess sodium sulfite, Na2SO3, and a trace of cobalt chloride, CoCl2, to bring DO to zero.”
(SM 4500-O G-2001, Section 3, Part a)
20 g sodium sulfite, Na2SO3 10 mg cobalt chloride, CoCl2
(a few crystals) 1 L water Dissolve with stir bar and stir plate. Good for 8 hours.
1 g sodium sulfite, Na2SO3 10 mg cobalt chloride, CoCl2
(a few crystals) 1 L water Dissolve with stir bar and stir plate. Good for 30 min., maybe longer.
Carefully pour the standard into a BOD bottle up to the neck. Add your Winkler reagents and titrate.
Carefully pour a portion of the standard into a beaker to attain a depth of 2 to 3 inches. Submerge the DO probe so that the tip is near the bottom of the beaker. Swirl gently and read.
One manual for a Thermo membrane electrode meter says that the probe must be inserted in the zero standard for at least 5 minutes. Another says 2.5 minutes.
There are some surprises in store for you when you explore the new versions of the Standard Methods methods.
Dave Johnson
johnsonda@co.muskegon.mi.us
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