Method References


Holding times should be from the documented time a sample was collected, not based on midnight of the last day. For example, if a semivolatile water sample (with a holding time of 7 days) was taken at 8:30 am on Tuesday, October 15, 2019, then the laboratory can extract that sample at any time up until 8:30 am on Tuesday, October 22, 2019 and be considered within the method's holding time.

Holding times are distinctions in the methods to try to reduce the effect of degradation on the results due to analyte decomposition, reaction, evaporation and any number of other effects of time on a sample matrix. However, a line has to be drawn somewhere for unacceptable losses and the method's holding time represents the best data available as to when the analysis is still completely valid. If an exact sample collection time is known, then the exact time should be used in calculating the holding times. If the collection time is recorded to the hour, the holding time should be interpreted to the hour. If the collection time is recorded to the hours and minutes, the holding time should be interpreted to the hours and minutes.

Ideally, laboratories should try to do the required preparation steps (i.e., extraction, digestion, etc.) in advance of the hold time's expiration so as to avoid hold time problems.

All chain of custody forms and sample acceptance forms will indicate the temperature of samples upon receipt.  The sample acceptance form will indicate if thermal preservation requirements for the analysis request have not been met.  This information is transferred during log-in to the LIMS record.  Metals analysis for all matrices including low level mercury, PCB analysis of a chemical waste, samples requiring radiological analyses, and soil samples requiring pH only analysis do not require thermal preservation.  Samples received for these analyses have met thermal preservation requirements even when received above 6oC.

METALS

Parameter

Method

Total Metals (excluding Hg)

6010/200.7 6020/200.8

Dissolved Metals (excluding Hg)

6010/200.7 6020/200.8

Chromium, hexavalent

7196A 3500Cr,B

Mercury

7470A/245.1


INORGANIC NON-METALS

Parameter

Method

Acidity, Total

2310B

Alkalinity, Total (CaCO3)

2320B

Ammonia (as N)

350.1R2.0

4500NH3, D

BOD, 5 Day

5210B

Bromide

300.0

CBOD, 5 Day

5210B

Chloride

4500Cl, E

4500Cl, C

Chlorine Residual, Free

4500Cl, G

Chlorine Residual, Total

4500Cl, G

Chlorophyll a

SM10200H

Chromium, Hexavalent

3500Cr,B

7196A

COD

5220D

Coliform, Fecal

COLILERT

Coliform, Total

SM9222B

Color, true

2120B

Conductivity

2510B

Cyanate

4500CN, L

Cyanide, Amenable

4500CN,C,G

Cyanide, Total

335.4R1.0

4500CN,C,E

9010B/9014

Cyanide, WAD

4500CN-I,E

Dissolved Oxygen

4500O,G

Fluoride

4500F,C

Hardness, Total (as CaCO3)

2340C

Hydrolyzable Phosphorus (as P)

4500P,B,E

Iron Bacteria

SM9222B

Iron, Ferrous

3500Fe. B

MBAS

SM5540C

Nitrate (as N)

353.2R2.0

Nitrate + Nitrite (as N)

4500NO3, E

Nitrite (as N)

4500NO2,B

Oil & Grease

1664A

Organic and Volatile Acids

HPLC-UV

Organic Phosphorus (as P)

4500P, A

Orthophosphate (as P)

4500P,E

pH @ 25°C

4500H+,B

9040B

Phenols

9066

420.4R1.0

Phosphate (as PO4)

4500P,B,E

Phosphorus (as P)

4500P,B,E

Settable Organic Solids

2540F, b

Settable Solids

2540F, b

Silica (as SiO2)

4500SiO2,C

Soluble COD

5220D

Sulfate

375.2R2.0

4500S04,E

Sulfide

4500S2C,D

Sulfite

4500SO3,B

Threshold Odor

2150B

TIC

5310C

TOC

5310C

9060

Total Carbon

5310C

Total Dissolved Solids

2540C

Total Kjeldahl Nitrogen (TKN)

351.2R2.0

Total Non-Volatile Suspnd Solids

2540E

Total Solids

2540B

Total Suspended Solids

2540D

Total Volatile Solids

2540E

Total Volatile Suspended Solids

2540E

TOX

9020B

TPH (SGT-HEM)

1664A

Turbidity

2130B


ORGANIC PARAMETERS

Parameter

Method

EDB/DBCP (Method 8011)

8011

Pesticides/PCBs

8081A/8082

Pesticides

608/8081A

Polychlorinated biphenyls (PCBs)

8082

Carbamate Pesticides

531.1R3.1

Endothall

548.1R1.0

Non-Halogenated Organic Compounds

8015B

Organophosphorus Pesticides

8141A

Dioxin, High Resolution

8290

Dioxin, Low Resolution

8280

Formaldehyde

8315A

Herbicides

8321A

Dissolved Gases

RSK175/D1946

Trihalomethanes (THMs)

524.2

Semi-Volatile Compounds (SVOCs)

625/8270C

Polynuclear Aromatic Hydrocarbons

8270C

TOC

5310C/9060

TOX

9020B

TPH

8015B

Volatile Organic Compounds

624/8260B


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