Research Article
Experimental Study on the Cause of Inorganic Scale Formation in the Water Injection Pipeline of Tarim Oilfield
Table 1
Water inorganic ion analysis method.
| Element | Method | Reference method | LOD |
| Chloride | Mohr/colorimetric method | ASTM D4458 | 0.5 mg/L |
| Basicity | Potentiometry | ASTM D 1067 | 1 mg/L |
| Ammonia | Titrimetry | GB/T 7478 | nitrogen 0.2 mg/L |
| Barium | Atomic absorption method | GB/T 15506 ASTM D 3651 | 1.7 mg/L |
| Calcium | Atomic absorption method EDTA titration | GB/T 11905 | 0.02 mg/L | GB/T 7476 | 1 mg/L |
| Ferrum | Atomic absorption method o-phenanthroline spectrophotometric method | GB/T 11911 ASTM D 1068 | |
| Magnesium | Atomic absorption method | GB/T 11905 | 0.0005 mg/L |
| Potassium | Atomic absorption method | GB/T 11904 | 0.05 mg/L |
| Sodium | Atomic absorption method | GB/T 11904 | 0.02 mg/L |
| Strontium | Atomic absorption method | SY/T 5982 | 0.03 mg/L |
| Sulfide | Iodometry | HJ/T 60 | 0.4 mg/L |
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