TABLE 2.
Chemical composition of deposits samples collected in the produced water system.
| Compound/elementa | LODb | DP1 | DP2 | DP3 |
| TPHc C6–9 (mg/Kg) | 0.2 | 5,900 | 22000 | 26000 |
| TPH C10–14 (mg/Kg) | 0.2 | 22,000 | 74000 | 87000 |
| TPH C15–28 (mg/Kg) | 0.4 | 1,400 | 83000 | 100000 |
| TPH C29–36 (mg/Kg) | 0.4 | <0.4 | 8100 | 12000 |
| TPH C > 36 (mg/Kg) | 0.4 | <0.4 | 3200 | 5300 |
| Calcium (mg/Kg) | 10 | 160 | 7100 | 1500 |
| Chromium (mg/Kg) | 1 | 11 | 120 | 77 |
| Copper (mg/Kg) | 1 | 7 | 1300 | 36 |
| Iron (mg/Kg) | 1 | 330,000 | 66000 | 58000 |
| Potassium (mg/Kg) | 10 | <10 | 820 | 790 |
| Magnesium (mg/Kg) | 10 | 30 | 1100 | 970 |
| Manganese (mg/Kg) | 1 | 2,900 | 470 | 260 |
| Sodium (mg/Kg) | 10 | <10 | 18000 | 36000 |
| Nickel (mg/Kg) | 1 | 8 | 260 | 170 |
| Sulfur (mg/Kg) | 10 | 77,000 | 41000 | 31000 |
| Zinc (mg/Kg) | 1 | <1 | 680 | 1900 |
| Total Nitrogen (mg/Kg) | 10 | 430 | 13000 | 28000 |
| Total Phosphorus (mg/Kg) | 1 | 3 | 11000 | 11000 |
| Ammonia-N (mg/Kg) | 10 | 30 | 60 | 70 |
| Chloride (mg/Kg) | 10 | 1,700 | 6400 | 8000 |
| Sulfate (mg/Kg) | 10 | 40,000 | 10 | 10 |
| Thiosulphate (mg/Kg) | 2 | 600 | 82 | 140 |
| Propionic Acid (mg/Kg) | 2 | 120 | <2 | <2 |
| Formic Acid (mg/Kg) | 2 | <2 | 30 | 70 |
| TOCd (mg/Kg) | 0.1 | 10 | 14 | 19 |
aNOx-N, Nitrate-N and Nitrite-N were not detected in any of the samples. bLOR, Limit of Detection. cTPH, Total Petroleum Hydrocarbons. dTOC, Total Organic Carbon.