Environmental Engineering Reference
In-Depth Information
TABLE 10.2
Recommended Maximum Holding Times for Samples Between Sampling
and Analysis
a
Time from sampling
Analysis
Immediate pH
6 hr Fecal coliform
Standard plate count
Ground and wastewater total coliform
24 hr 502/524 (unpreserved)
Hexavalent chromium
Odor
Residual chlorine
THM and HAA formation potential
30 hr Total coliform in DW
36 hr Bioassay
48 hr Asbestos
BOD/CBOD
Chlorophyll A
Color
Dissolved oxygen (modified Winkler method)
Nitrate/nitrite
Orthophosphate
Surfactants
Turbidity
UV254
72 hr EPA 18 (air)
Radon
7 days Most extractable organics
Sulfide
TDS/TSS
VOC aromatics (unpreserved)
a
See EPA web site http://epa.gov/ for specifics of analysis.
Note:
Holding times start at the time of taking the sample!
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