This method is for the determination of dissolved metals in water, wastewater, and solid wastes. A homogeneous aliquot of the sample is solubilized with nitric and hydrochloric acids and analyzed by ICP/AES (inductively coupled plasma-atomic emission spectrometry).
The method can be used for the determination of dissolved or total recoverable elements. If dissolved metals are required the sample is filtered first through a 0.45 µm filter. If the sample is not filtered the results are considered total recoverable metals.
Aqueous samples containing suspended or particulate material ≥ 1% (w/v) should be extracted as a solid type sample.
When determining boron or silica, only plastic, PTFE or quartz labware should be used from the time of sample collection to analysis.
This method is approved for use in compliance monitoring programs (e.g.: Clean Water Act (NPDES) or Safe Drinking Water Act (SDWA).
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | 6 months from sample preservation to analysis |
| Preservatives: | Total recoverable elements: preserve with HNO3 to pH <2 within two weeks of collection. Dissolve elements: acidfy the filtrate with HNO3 to pH <2 immediately after filtration. |
| Required Preps: | 125 - 250mL HDPE or PTFE bottle with Teflon-lined lid |
| Collection Method: | Grab sampling |
| Analytical Methodology: | ICP |
| Documentation: | 
200.7
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Aluminum | Al |
7429-90-5 |
0.02 |
mg/L |
| Iron | Fe |
7439-89-6 |
0.03 |
mg/L |
| Lead | Pb |
7439-92-1 |
0.01 |
mg/L |
| Lithium | Li |
7439-93-2 |
0.001 |
mg/L |
| Magnesium | Mg |
7439-95-4 |
0.02 |
mg/L |
| Manganese | Mn |
7439-96-5 |
0.001 |
mg/L |
| Mercury | Hg |
7439-97-6 |
0.007 |
mg/L |
| Molybdenum | Mo |
7439-98-7 |
0.004 |
mg/L |
| Nickel | Ni |
7440-02-0 |
0.005 |
mg/L |
| Potassium | K |
7440-09-7 |
0.3 |
mg/L |
| Silver | Ag |
7440-22-4 |
0.002 |
mg/L |
| Sodium | Na |
7440-23-5 |
0.03 |
mg/L |
| Strontium | Sr |
7440-24-6 |
0.0003 |
mg/L |
| Thallium | Tl |
7440-28-0 |
0.001 |
mg/L |
| Tin | Sn |
7440-31-5 |
0.007 |
mg/L |
| Titanium | Ti |
7440-32-6 |
0.02 |
mg/L |
| Antimony | Sb |
7440-36-0 |
0.008 |
mg/L |
| Arsenic | As |
7440-38-2 |
0.008 |
mg/L |
| Barium | Ba |
7440-39-3 |
0.001 |
mg/L |
| Beryllium | Be |
7440-41-7 |
0.0003 |
mg/L |
| Boron | B |
7440-42-8 |
0.003 |
mg/L |
| Cadmium | Cd |
7440-43-9 |
0.001 |
mg/L |
| Cerium | Ce |
7440-45-1 |
0.02 |
mg/L |
| Chromium | Cr |
7440-47-3 |
0.004 |
mg/L |
| Cobalt | Co |
7440-48-4 |
0.002 |
mg/L |
| Copper | Cu |
7440-50-8 |
0.003 |
mg/L |
| Vanadium | V |
7440-62-2 |
0.003 |
mg/L |
| Zinc | Zn |
7440-66-6 |
0.002 |
mg/L |
| Calcium | Ca |
7440-70-2 |
0.01 |
mg/L |
| Silica (SiO2) | SiO2 |
7631-86-9 |
0.02 |
mg/L |
| Phosphorus | P |
7723-14-0 |
0.06 |
mg/L |
| Selenium | Se |
7782-49-2 |
0.02 |
mg/L |
* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.