The article contains sections titled: 1. Phosphorus ‐ Oxygen Compounds 1.1. Phosphorus Pentoxide 1.2. Other Phosphorus Oxides 1.3. Phosphorus Acids and their Salts 1.3.1. Phosphinic Acid 1.3.2. Phosphonic Acid 2. Phosphorus ‐ Halogen Compounds 2.1. Phosphorus Tri‐ and Pentahalides 2.1.1. Phosphorus Trichloride 2.1.2. Phosphorus Pentachloride 2.1.3. Phosphorus Tribromide 2.1.4. Phosphorus Fluorides 2.2. Phosphoryl and Thiophosphoryl Halides 2.2.1. Phosphoryl Chloride 2.2.2. Thiophosphoryl Chloride 3. Phosphorus Sulfides 4. Phosphides 5. Phosphorus ‐ Hydrogen Compounds 6. Phosphorus ‐ Nitrogen Compounds 7. Toxicology

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The article contains sections titled: 1. Monophosphoric Acid 1.1. Properties 1.2. Production 1.2.1. Thermal Processes 1.2.2. Wet Processes 1.2.3. Concentration of Wet Phosphoric Acid 1.2.4. Purification of Wet Phosphoric Acid 1.3. Uses and Economic Aspects 1.4. Environmental Aspects 2. Condensed Phosphoric Acids 3. Phosphates 3.1. Sodium Monophosphates 3.2. Condensed Sodium Phosphates 3.2.1. Properties 3.2.2. Metal Complexing by Phosphates 3.2.2.1. Introduction 3.2.2.2. Analytical Methods 3.2.2.3. Complexing by Individual Phosphates 3.2.2.4. Other Concepts Besides the Stability Constant 3.2.3. Sodium Diphosphates 3.2.4. Pentasodium Triphosphate 3.2.5. Higher Condensed Sodium Polyphosphates 3.2.6. Sodium Metaphosphates 3.2.7. Uses of Condensed Sodium Phosphates 3.3. Other Phosphates 3.3.1. Potassium Phosphates 3.3.2. Ammonium Phosphates 3.3.3. Magnesium Phosphates 3.3.4. Calcium Phosphates 3.3.5. Boron Phosphate 3.3.6. Aluminum Phosphates 3.4. Economic Aspects 4. Toxicology

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