1. Introduction
2. Chemical Thermodynamics and Kinetics
3. Acids and Bases
4. Dissolved Carbon Dioxide
5. Atmosphere-Water Interactions
6. Metal Ions in Aqueous Solution: Aspects of Coordination Chemistry
7. Precipitation and Dissolution
8. Oxidation and Reduction; Equilibria and Microbial Mediation
9. The Solid-Solution Interface
10. Trace Metals: Cycling, Regulation, and Biological Role
11. Kinetics of Redox Processes
12. Photochemical Processes
13. Kinetics at the Solid-Water Interface: Adsorption, Dissolution
of Minerals, Nucleation, and Crystal Growth
14. Particle-Particle Interaction: Colloids, Coagulation, and
Filtration
15. Regulation of the Chemical Composition of Natural Waters
References
Appendixes: Thermodynamic Data
1. Introduction | 1 | |
1.1 | Scope of Aquatic Chemistry | 1 |
1.2 | The Solvent Water | 6 |
1.3 | Solute Species | 9 |
Suggested Readings | 11 | |
Appendix 1.1: Some Useful Quantities, Units, Conversion Factors, Constants, and Relationships |
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2. Chemical Thermodynamics and Kinetics | 16 | |
2.1 | Introduction | 16 |
2.2 | Chemical Thermodynamic Principles | 20 |
2.3 | Systems of Variable Composition: Chemical Thermodynamics | 29 |
2.4 | Gibbs Energy and Systems of Variable Chemical Composition | 32 |
2.5 | Chemical Potentials of Pure Phases and Solutions | 35 |
2.6 | Chemical Potentials of Aqueous Electrolytes | 38 |
2.7 | The Equilibrium Constant | 41 |
2.8 | The Gibbs Energy of a System | 44 |
2.9 | Driving Force for Chemical Reactions | 49 |
2.10 | Temperature and Pressure Effects on Equilibrium | 52 |
2.11 | Equilibrium Tools | 57 |
2.12 | Kinetics and Thermodynamics: Time and Reaction Advancement, ξ | 58 |
2.13 | Rate and Mechanism | 61 |
2.14 | Concentration Versus Time | 64 |
2.15 | Theory of Elementary Processes | 69 |
2.16 | Elementary Reactions and ACT | 76 |
2.17 | Equilibrium Versus Steady State in Flow Systems | 79 |
Suggested Readings | 81 | |
Problems | 82 | |
Answers to Problems | 85 |
3. Acids and Bases | 88 | |
3.1 | Introduction | 88 |
3.2 | The Nature of Acids and Bases | 90 |
3.3 | The Strength of an Acid or Base | 92 |
3.4 | Activity and pH Scales | 97 |
3.5 | Equilibrium Calculations | 105 |
3.6 | pH as a Master Variable; Equilibrium Calculations Using a Graphical Approach | 118 |
3.7 | Ionization Fractions of Acids, Bases, and Ampholytes | 127 |
3.8 | Titration of Acids and Bases | 130 |
3.9 | Buffer Intensity and Neutralizing Capacity | 134 |
3.10 | Organic Acids | 140 |
Suggested Readings | 144 | |
Problems |
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Answers to Problems |
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4. Dissolved Carbon Dioxide |
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4.1 | Introduction | 148 |
4.2 | Dissolved Carbonate Equilibria (Closed System) | 150 |
4.3 | Aqueous Carbonate System Open to the Atmosphere | 157 |
4.4 | Alkalinity and Acidity, Neutralizing Capacities | 163 |
4.5 | Alkalinity Changes | 172 |
4.6 | Analytical Considerations: Gran Plots | 179 |
4.7 | Equilibrium with Solid Carbonates | 186 |
4.8 | Kinetic Considerations | 192 |
4.9 | Carbon Isotopes and Isotope Fractionation | 195 |
Suggested Readings | 202 | |
Problems | 202 | |
Answers to Problems | 204 |
5. Atmosphere - Water Interactions | 206 | |
5.1 | Introduction | 206 |
5.2 | Anthropogenic Generation of Acidity in the Atmosphere | 207 |
5.3 | Gas - Water Partitioning: Henry's Law | 212 |
5.4 | Gas - Water Equilibria in Closed and Open Systems | 216 |
5.5 | Washout of Pollutants from the Atmosphere | 227 |
5.6 | Fog | 229 |
5.7 | Aerosols | 233 |
5.8 | Acid Rain - Acid Lakes | 235 |
5.9 | The Volatility of Organic Substances | 238 |
5.10 | Gas Transfer Across Water - Gas Interface | 241 |
Suggested Readings | 248 | |
Problems | 249 | |
Aswers to Problems | 251 |
6. Metal Ions in Aqueous Solution: Aspects of Coordination Chemistry | 252 | |
6.1 | Introduction | 252 |
6.2 | Protons and Metal Ions | 258 |
6.3 | Hydrolysis of Metal Ions | 263 |
6.4 | Solubility and Hydrolysis: Solid Hydroxides and Metal Oxides | 272 |
6.5 | Chelates | 275 |
6.6 | Metal Ions and Ligands: Classification of Metals | 281 |
6.7 | Speciation in Fresh Waters | 289 |
6.8 | Seawater Speciation | 305 |
6.9 | Kinetics of Complex Formation | 311 |
Suggested Readings | 319 | |
Problems | 320 | |
Answers to Problems | 322 | |
Appendix 6.1: Stability Constants | 325 | |
Appendix 6.2: The Various Scales for Equilibrium Constants, Activity Coefficients, and pH | 335 |
7. Precipitation and Dissolution | 349 | |
7.1 | Introduction | 349 |
7.2 | The Solubility of Oxides and Hydroxides | 359 |
7.3 | Complex Formation and Solubility of (Hydr)oxides | 368 |
7.4 | Carbonates | 370 |
7.5 | The Stability of Hydroxides, Carbonates, and Hydroxide Carbonates | 389 |
7.6 | Sulfides and Phosphates | 398 |
7.7 | The Phase Rule: Components, Phases, and Degrees of Freedom | 409 |
7.8 | Solubility of Fine Particles | 413 |
7.9 | Solid Solutions | 416 |
Suggested Readings | 420 | |
Problems | 420 | |
Answers to Problems | 424 |
8. Oxidation and Reduction; Equilibria and Microbial Mediation | 425 | |
8.1 | Introduction | 425 |
8.2 | Redox Equilibria and the Electron Activity | 426 |
8.3 | The Electrode Potential: The Nernst Equation and the Electrochemical Cell | 441 |
8.4 | pε-pH, Potential-pH Diagrams | 455 |
8.5 | Redox Conditions in Natural Waters | 464 |
8.6 | Effect of Complex Formers on the Redox Potential | 489 |
8.7 | Measuring the Redox Potential in Natural Waters | 491 |
8.8 | The Potentiometric Determination of Individual Solutes | 498 |
Suggested Readings | 506 | |
Problems | 507 | |
Answers to Problems | 512 | |
Appendix 8.1: Activity Ratio Diagrams for Redox Systtems | 513 |
9. The Solid-Solution Interface | 516 | |
9.1 | Introduction | 516 |
9.2 | Adsorption | 519 |
9.3 | Adsorption Isotherms | 521 |
9.4 | Hydrous Oxide Surfaces; Reactions with H+, OH-, Metal Ions, and Ligands | 533 |
9.5 | Surface Charge and the Electric Double Layer | 549 |
9.6 | Correcting Surface Complex Formation Constants for Surface Charge | 568 |
9.7 | Sorption of Hydrophobic Substances on Organic Carbon-Bearing Particles | 575 |
9.8 | Ion Exchange | 586 |
9.9 | Transport of (Ad)sorbable Constituents in Groundwater and Soil Systems | 594 |
Suggested Readings |
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Problems | 601 | |
Appendix 9.1: The Gouy-Chapman Theory | 604 | |
Appendix 9.2: Contact Angle, Adhesion and Cohesion, the Oil-Water Interface | 608 |
10. Trace Metals: Cycling, Regulation, and Biological Role | 614 | |
10.1 | Introduction: Global Cycling of Metals | 614 |
10.2 | Analytical Approaches to Chemical Speciation | 615 |
10.3 | Classification of Metal Ions and the Inorganic Chemistry of Life | 625 |
10.4 | Organometallic and Organometalloidal Compounds | 628 |
10.5 | Bioavailability and Toxicity | 632 |
10.6 | Metal Ions as Micronutrients | 637 |
10.7 | The Interaction of Trace Metals with Phytoplankton at the Molecular Level | 641 |
10.8 | Regulation of Trace Elements by the Solid-Water Interface in Surface Waters | 648 |
10.9 | Regulation of dissolved Heavy Metals in Rivers, Lakes, and Oceans | 654 |
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Quality Criteria in Fresh Waters: Some Aspects |
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Suggested Readings |
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11. Kinetics of Redox Processes | 672 | |
11.1 | Introduction | 672 |
11.2 | How Good an Oxidant Is O2? | 672 |
11.3 | Can pε Be Defined for a Nonequilibrium System? | 677 |
11.4 | Kinetics of Redox Processes: Case Studies | 679 |
11.5 | Oxidants Used in Water and Waste Technology: A Few Case Studies | 691 |
11.6 | Linear Free Energy Relations (LFERs) | 702 |
11.7 | The Marcus Theory of Outer-Sphere Electron Transfer: An Introduction | 703 |
11.8 | Nucleophile-Electrophile Interactions and Redox Reactions Involving Organic Substances | 710 |
11.9 | Corrosion of Metals as an Electrochemical Process | 720 |
Suggested Readings |
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12. Photochemical Processes | 726 | |
12.1 | Introduction | 726 |
12.2 | Absorption of Light | 729 |
12.3 | Photoreactants | 735 |
12.4 | Photoredox Reactions: Photolysis of Transition Metal Complexes | 743 |
12.5 | Photochemical Reactions in Atmospheric Waters: Role of Dissolved Iron Species | 744 |
12.6 | Heterogeneous Photochemistry | 748 |
12.7 | Semiconducting Minerals | 753 |
Suggested Readings |
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13. Kinetics at the Solid-Water Interface: Adsorption, Dissolution of Minerals, Nucleation, and Crystal Growth | 760 | |
13.1 | Introduction | 760 |
13.2 | Kinetics of Adsorption | 760 |
13.3 | Surface-Controlled Dissolution of Oxide Minerals: An Introduction to Weathering | 771 |
13.4 | Simple Rate Laws in Dissolution | 776 |
13.5 | Rates of CaCO3 Dissolution (and of CaCO3 Crystal Growth | 788 |
13.6 | Inhibition of Dissolution | 795 |
13.7 | Nucleation and Crystal Growth | 800 |
Suggested Readings |
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14. Particle-Particle Interaction: Colloids, Coagulation. and Filtration | 818 | |
14.1 | Colloids | 818 |
14.2 | Particle Size Distribution | 826 |
14.3 | Surface Charge of Colloids | 834 |
14.4 | Colloid Stability: Qualitative Considerations | 837 |
14.5 | Effects of Surface Speciation on Colloid Stability | 842 |
14.6 | Some Water-Technological Considerations in Coagulation, Filtration, and Flotation | 852 |
14.7 | Filtration Compared with Coagulation | 857 |
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Transport in Aggregation and Deposition |
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Suggested Readings | 866 | |
Appendix 14.1: A Physical Model (DLVO) for Colloid Stability | 867 |
15. Regulation of the Chemical Composition of Natural Waters | 872 | |
15.1 | Introduction | 872 |
15.2 | Weathering and the Proton Balance | 875 |
15.3 | Isothermal Evaporation | 880 |
15.4 | Buffering | 884 |
15.5 | Interactions Between Organisms and Abiotic Environment: Redfield Stoichiometry | 886 |
15.6 | The Oceans: Relative Constancy of the Composition and Chemical Equilibria | 895 |
15.7 | Constancy of Composition: Steady State | 897 |
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Hydrothermal Vents |
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15.9 | The Sediment-Water Interface | 903 |
15.10 | Biological Regulation of the Composition | 908 |
15.11 | Global Cycling: The Interdependence of Biogeochemical Cycles | 914 |
15.12 | The Carbon Cycle | 916 |
15.13 | Nitrogen Cycles: Pollution by Nitrogen Compounds | 927 |
15.14 | The Sulfur Cycle | 932 |
Suggested Readings | 933 |
References | 935 | |
Appendixes: Thermodynamic Data |
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1 | Revised Chemical Equilibrium Data for Major Water-Mineral Reactions | 977 |
2 | Thermodynamic Data for Trace Metal Speciation in Seawater | 984 |
3 | Thermodynamic Properties | 990 |
Index | 1005 |