This method is for the determination of dissolved elements in ground waters, surface waters, and drinking water. It can also be used for determination of total recoverable element concentrations in waters as well as wastewaters, sludges and soils samples.
For total recoverable analysis of a solid or an aqueous sample containing undissolved material, analytes are first
solubilized by gentle refluxing with nitric and hydrochloric acids. For the determination of dissolved analytes, the sample be filtered through a 0.45 µm filter immediatly after collection. An aliquot of the filtered aqueous sample or for the "direct analysis" total recoverable determination of analytes in drinking water where sample turbidity is <1 NTU, the sample is acidified with nitric acid, and then diluted to a predetermined volume and mixed before analysis. Analyses for both preparations are performed by ICP/MS (inductively coupled plasma mass spectrometry).
Aqueous samples containing suspended or particulate material ≥ 1% (w/v) should be extracted as a solid type sample
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | 6 months from preservation to analysis for waters and no holding time established for solids |
| 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. Solid samples should be kept at 4°C. |
| Required Preps: | 250mL Glass or HDPE bottle |
| Collection Method: | Grab sampling |
| Analytical Methodology: | ICP/MS |
| Documentation: | 
200.8
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Aluminum | Al |
7429-90-5 |
1 |
µg/L |
| Lead | Pb |
7439-92-1 |
0.6 |
µg/L |
| Manganese | Mn |
7439-96-5 |
0.1 |
µg/L |
| Molybdenum | Mo |
7439-98-7 |
0.3 |
µg/L |
| Nickel | Ni |
7440-02-0 |
0.5 |
µg/L |
| Silver | Ag |
7440-22-4 |
0.1 |
µg/L |
| Thallium | Tl |
7440-28-0 |
0.3 |
µg/L |
| Thorium | Th |
7440-29-1 |
0.1 |
µg/L |
| Antimony | Sb |
7440-36-0 |
0.4 |
µg/L |
| Arsenic | As |
7440-38-2 |
1.4 |
µg/L |
| Barium | Ba |
7440-39-3 |
0.8 |
µg/L |
| Beryllium | Be |
7440-41-7 |
0.3 |
µg/L |
| Cadmium | Cd |
7440-43-9 |
0.5 |
µg/L |
| Chromium | Cr |
7440-47-3 |
0.9 |
µg/L |
| Cobalt | Co |
7440-48-4 |
0.09 |
µg/L |
| Copper | Cu |
7440-50-8 |
0.5 |
µg/L |
| Uranium | U |
7440-61-1 |
0.1 |
µg/L |
| Vanadium | V |
7440-62-2 |
2.5 |
µg/L |
| Zinc | Zn |
7440-66-6 |
1.8 |
µg/L |
| Selenium | Se |
7782-49-2 |
7.9 |
µg/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.