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LoginMonitoring of metals in emission is important for several reasons. First and foremost, high levels of metals emitted into the environment can have a negative on the environment. Due to the potential for long range transport this environmental impact can happen at distances far away from the source.
Secondly, to follow local legislations and permits, monitoring of metals is frequently a requirement to ensure levels are below permit levels
Metals emissions are sampled using an impinger train that collects air drawn isokinetically from a stack sampling point. Particulates are collected on sampling probes and heated filters. The gaseous load is collected in an acidified hydrogen peroxide solution. This is effective for all metals except mercury, which is collected in an acidified potassium permanganate solution. Analysis is performed by ICP-OES/MS and AFS (mercury) using one of the following methods:
| Metal | µg/sample |
|---|---|
| Aluminum (Al) | 20 |
| Antimony (Sb) | 0.2 |
| Arsenic (As) | 1 |
| Barium (Ba) | 5 |
| Beryllium (Be) | 0.2 |
| Bismuth (Bi) | 0.5 |
| Boron (B) | 30 |
| Cadmium (Cd) | 0.1 |
| Calcium (Ca) | 500 |
| Chromium (Cr) | 1 |
| Cobalt (Co) | 0.2 |
| Copper (Cu) | 1 |
| Iron (Fe) | 200 |
| Lead (Pb) | 0.5 |
| Lithium (Li) | 0.5 |
| Magnesium (Mg) | 10 |
| Manganese (Mn) | 0.5 |
| Molybdenum (Mo) | 0.2 |
| Nickel (Ni) | 0.2 |
| Phosphorus (P) | 100 |
| Potassium (K) | 100 |
| Selenium (Se) | 2 |
| Silicon (Si) | 3000 |
| Silver (Ag) | 0.2 |
| Sodium (Na) | 30 |
| Strontium (Sr) | 0.2 |
| Sulfur (S) | 10000 |
| Tellurium (Te) | 6 |
| Thallium (Tl) | 0.2 |
| Tin (Sn) | 0.3 |
| Titanium (Ti) | 10 |
| Tungsten (W) | 6 |
| Uranium (U) | 0.3 |
| Vanadium (V) | 1 |
| Zinc (Zn) | 6 |
| Chromium (VI) | 0.3 |
