Approximately 40 people attended with expertise ranging from cloud chemistry modeling to measurements of clouds, aerosols, and trace gases. Clouds also are aqueous-phase chemical reactors, scavenging soluble gas-phase precursors and supporting oxidation reactions that contribute to increased aerosol mass when the cloud drops evaporate.
Johnson and Peter W. Bush Professional Paper A Groundwater Chemistry The chemistry of water in the Floridan aquifer system is briefly discussed here; the geochemistry of the system is discussed in detail in Professional Paper I.
In the unconfined or semiconfined areas where flow is vigorous, dissolved-solids concentrations are low.
Where the system is tightly confined, flow is more sluggish and concentrations are higher.
In Florida south of Lake Okeechobee and in parts of the St. Johns River valley, residual saltwater remains unflushed from the system and dissolved- Chemistry water summary concentrations are high. Concentrations also become increasingly higher in coastal areas as the freshwater-saltwater interface is approached.
Locally, smaller amounts of dissolved iron, manganese, nitrate, phosphate, fluoride, strontium, sulfide, and silica contribute to the dissolved-solids concentration. Map showing dissolved-solids concentration of water from the Upper Floridan aquifer.
Higher concentrations are generally due to the presence of seawater in the system. In coastal areas of Florida, northeast Georgia, and South Carolina, seawater should occur in the lower part of the Upper Floridan where predevelopment heads were low; high chloride concentrations in fully penetrating coastal wells have indicated that seawater is present in these areas.
High dissolved-solids concentrations along the coast of southeast Georgia and northeast Florida cannot be attributed to seawater, however, because chloride concentrations in the Upper Floridan are not high.
Declining heads in the Upper Floridan apparently have induced highly mineralized, low-chloride water from the Lower Floridan to move upward, gradually increasing dissolved-solids concentrations over a large area.
According to Brownhighly mineralized, low-chloride water may have been present throughout most of the Fernandina permeable zone of the Lower Floridan prior to development. The principal chemical processes leading to the development of the hydrochemical facies in the Upper Floridan are: Each of these processes exhibits distinctive chemical traits; thus the hydrochemical facies map, when combined with hydrogeologic data, can generally identify the predominant processes in any part of the Upper Floridan system.
Hydrochemical facies of the Upper Florida aquifer. Where incongruent dissolution of dolomite adds sufficient Mg to the water, a calcium-magnesium-bicarbonate facies develops. Along the coast of Georgia and northeast Florida, gypsum dissolution adds SO4 and a calcium-magnesium-bicarbonate-sulfate facies develops.
In southwest Florida, residual gypsum occurs in moderate quantities in the Upper Floridan; in this area of sluggish flow, sulfate is the predominant anion, and a calcium-magnesium-sulfate facies occurs.
This same facies has developed in the Gulf Trough area of southwest Georgia and in adjacent northwest Florida. The Gulf Trough is a narrow band of low-permeability rocks extending northeastward across south-central Georgia that impedes ground-water circulation and slows dissolution of residual gypsum in the Upper Floridan.
Other data presented in Professional Paper I indicate that small amounts of residual seawater also contribute to the high dissolved-solids concentrations occurring in Gadsden County, Fla. Within the Upper Floridan vertical mixing of fresh-water and seawater occurs naturally in the zone of dispersion along the transition zone between freshwater and saltwater.
In this zone the water chemistry gradually changes from calcium-magnesium-bicarbonate type with low dissolved solids near the top, to seawater at the bottom.
Lateral changes in hydrochemical facies also occur along the coasts of central Florida and southeast South Carolina because of increasing amounts of seawater in the Upper Floridan. Inland a few miles from the coast, a calcium-magnesium-bicarbonate facies generally occurs. Nearer the sea, the Upper Floridan contains some seawater at depth, and the small amounts of seawater change the water from calcium-magnesium-bicarbonate dominated to water with approximately equal proportions of all major constituents designated "Mixed" on plate 3.
As the seawater content of the Upper Floridan increases, there is a change to sodium-chloride facies. The effects of freshwater-saltwater mixing on deep wells in coastal areas is dependent on the depth position of the interface, the depth of the well, and the rate of pumpage.
Water from lightly pumped, shallow wells in most coastal areas would not be as affected by the seawater, and might be quite similar to freshwater from wells farther inland.
Mixing of freshwater with residual saline water produces changes in hydrochemical facies and dissolved-solids concentrations similar to mixing freshwater and present day seawater. In south Florida flow is very sluggish due to very thick confinement of the system, and residual saline water occurs in the Upper Floridan.
Mixing of residual seawater in the Upper Floridan with freshwater could also produce the high dissolved-solids concentrations and sodium-chloride facies mapped in the valley of the St.
However, an alternative explanation for the highly mineralized water occurring in that area was offered by Wyrick and Leve They suggested that saline water from deeper units is rising into the Upper Floridan along fault zones in northeast Florida.
Invasion of the Upper Floridan by more mineralized water has been documented in Valdosta, Ga. Krause,Brunswick, Ga. Wait,and Nassau County, Fla. Fairchild and Bentley, AP Chemistry is an in-depth, fast-paced second-year chemistry course for advanced, science-oriented students. The course will provide students with a thorough grounding in chemical principles and quantitative reasoning, with an emphasis on inorganic chemistry.
Water is a chemical substance that is essential to all known forms of life. It appears colorless to the naked eye in small quantities, though it is actually slightly blue in color.
It covers 71% of Earth's surface.
American Chemical Society: Chemistry for Life. Still there, or gone to get coffee??? For your security, this online session is about to end due to inactivity. Export summary to Word Export summary to PDF Notify me of changes. Unit of competency details NWPA - Apply principles of chemistry to water systems and processes (Release 2) Summary.
Releases: Release Status Release date; 1 Apply chemistry to water processes. Chemistry is the study of matter: its composition, properties, and reactivity.
(In advance, make copies of the Introduction to Water Chemistry Worksheet and prepare to show the class the attached slide Introduction to Water Chemistry Presentation, a PowerPoint file.) Water, or H 2 O, is a small yet complex molecule that can be linked to . The molecule of water. A molecule is an aggregation of atomic nuclei and electrons that is sufficiently stable to possess observable properties — and there are few molecules that are more stable and difficult to decompose than H 2 O. In water, each hydrogen nucleus is bound to the central oxygen atom by a pair of electrons that are shared between them; chemists call this shared electron pair. Chemistry Lecture Notes The pages on this website are the chemistry lecture notes, including charts and diagrams, that I have developed over the past several years for teaching chemistry. I have published these notes to provide chemistry help for high school and college chemistry students.
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