|
|
Element
|
MDL (mg/L)
|
EPA Method
|
Price
|
Time
|
|
Aluminum
|
0.05
|
200.7
|
11.00
|
3 weeks
|
|
Antimony
|
0.05
|
200.7
|
11.00
|
3 weeks
|
|
Antimony
|
0.0004
|
200.8
|
16.00
|
3 weeks
|
|
Arsenic
|
0.05
|
200.7
|
11.00
|
3 weeks
|
|
Arsenic (ICP-MS)
|
0.0003
|
200.8
|
16.00
|
3 weeks
|
|
Barium (ICP-MS)
|
0.0001
|
200.8
|
16.00
|
3 weeks
|
|
Beryllium (ICP-MS)
|
0.0002
|
200.8
|
16.00
|
3 weeks
|
|
Boron
|
0.01
|
200.7
|
11.00
|
3 weeks
|
|
Cadmium
|
0.01
|
200.7
|
11.00
|
3 weeks
|
|
Cadmium (ICP-MS)
|
0.0001
|
200.8
|
16.00
|
3 weeks
|
|
Chromium
|
0.01
|
200.7
|
11.00
|
3 weeks
|
|
Chromium (ICP-MS
|
0.0001
|
200.8
|
16.00
|
3 weeks
|
|
Cobalt
|
0.01
|
200.7
|
11.00
|
3 weeks
|
|
Copper
|
0.01
|
200.7
|
11.00
|
3 weeks
|
|
Copper (ICP-MS)
|
0.0003
|
200.8
|
16.00
|
3 weeks
|
|
Gallium
|
0.05
|
ICP
|
11.00
|
3 weeks
|
|
Gold
|
0.05
|
ICP
|
11.00
|
3 weeks
|
|
Iridium
|
0.05
|
ICP
|
11.00
|
3 weeks
|
|
Iron
|
0.05
|
200.7
|
11.00
|
3 weeks
|
|
Lead
|
0.05
|
200.7
|
11.00
|
3 weeks
|
|
Lead (ICP-MS)
|
0.0001
|
200.8
|
17.00
|
3 weeks
|
|
Lanthanum
|
0.02
|
ICP
|
11.00
|
3 weeks
|
|
Lithium
|
0.05
|
ICP
|
11.00
|
3 weeks
|
|
Manganese
|
0.02
|
200.7
|
11.00
|
3 weeks
|
|
Mercury (ICP-MS)
|
0.0002
|
200.8
|
20.00
|
3 weeks
|
|
Molybdenum (ICP-MS)
|
0.05
|
200.8
|
20.00
|
3 weeks
|
|
Nickel
|
0.01
|
200.7
|
11.00
|
3 weeks
|
|
Nickel
|
0.00005
|
200.8
|
16.00
|
3 weeks
|
|
Palladium
|
0.05
|
ICP
|
11.00
|
3 weeks
|
|
Phosphorus
|
0.05
|
ICP
|
11.00
|
3 weeks
|
|
Platinum
|
0.05
|
ICP
|
11.00
|
3 weeks
|
|
Rhenium
|
0.05
|
ICP
|
11.00
|
3 weeks
|
|
Rhodium
|
0.05
|
ICP
|
11.00
|
2 weeks
|
|
Rubidium
|
0.05
|
AA
|
11.00
|
3 weeks
|
|
Ruthenium
|
0.05
|
ICP
|
11.00
|
3 weeks
|
|
Selenium
|
0.05
|
200.7
|
11.00
|
3 weeks
|
|
Selenium (ICP-MS)
|
0.001
|
200.8
|
16.00
|
3 weeks
|
|
Silica
|
0.05
|
200.7
|
11.00
|
3 weeks
|
|
Silver
|
0.02
|
200.7
|
13.00
|
3 weeks
|
|
Strontium
|
0.01
|
ICP
|
11.00
|
3 weeks
|
|
Tellurium
|
0.05
|
ICP
|
11.00
|
3 weeks
|
|
Thallium
|
0.01
|
200.7
|
11.00
|
3 weeks
|
|
Thallium (ICP-MS)
|
0.00003
|
200.8
|
16.00
|
3 weeks
|
|
Tin
|
0.05
|
ICP
|
11.00
|
3 weeks
|
|
Titanium
|
0.05
|
ICP
|
11.00
|
3 weeks
|
|
Tungsten
|
0.05
|
ICP
|
11.00
|
3 weeks
|
|
Uranium
|
0.05
|
ICP-MS
|
16.00
|
3 weeks
|
|
Vanadium
|
0.05
|
200.7
|
11.00
|
3 weeks
|
|
Zinc
|
0.01
|
200.7
|
11.00
|
3 weeks
|
|
Zirconium
|
0.05
|
ICP
|
11.00
|
3 weeks
|
|
SDWA Metals=Sb, As, Ba, Be,
Cd, Cr, Ni, Hg, Se, and Tl
|
see above
|
200.8
|
161.00
|
3 weeks
|
|
Lead and Copper
|
see above
|
200.8
|
26.00
|
3 weeks
|
|
|
Note: Preservation of Metals group analysis using
nitric acid
The Laboratory has had trouble with samples acidified in the field. Some
acids are not as pure as the trace pure product that we purchase. This
leads to contamination with either the metal being analyzed or addition of a
element that interferes with the analysis. This interference is due to
the sensitivity of an iductively coupled plasma mass spectormeter and the
interfering masses caused by element contamination and combination of oxide,
hydroxide and argon with the element.
EPA allows the laboratory to acidify the sample after receiving, if it is
received within 14 days. We then are required to let the sample set,
after acidification, for 16 hours. You can find this information in the
EPA 200.8 method for trace elements. Insert below is from the revision
5.4, 1994. Important portion is underlined.
8.3 For the determination of total recoverable elements in aqueous
samples, samples are not filtered, but acidified with (1+1) nitric acid to pH
<2 (normally, 3 mL of (1+1) acid per liter of sample is sufficient for
most ambient and drinking water samples). Preservation may be done
at the time of collection, however, to avoid the hazards of strong acids in
the field, transport restrictions, and possible contamination it is
recommended that the samples be returned to the laboratory within two weeks
of collection and acid preserved upon receipt in the laboratory.
Following acidification, the sample should be mixed, held for 16 hours, and
then verified to be pH <2 just prior withdrawing an aliquot for processing
or "direct analysis". If for some reason such as high
alkalinity the sample pH is verified to be >2, more acid must be added and
the sample held for 16 hours until verified to be pH <2. See Section 8.1.
|
