John David Hem
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View article: Development of a model to predict the adsorption of lead from solution on a natural streambed sediment
Development of a model to predict the adsorption of lead from solution on a natural streambed sediment Open
Adsorption of solutes by solid mineral surfaces commonly influences the dissolved ionic composition of natural waters. A model based on electrical double-layer theory has been developed which appears to be capable of characterizing the sur…
View article: Reactions of aqueous aluminum species at mineral surfaces
Reactions of aqueous aluminum species at mineral surfaces Open
Aqueous aluminum solutions containing 4.5 ? 10 4 molar aluminum in 0.01 molar NaC104 were partly neutralized with NaOH to give OH:A1 mole ratios from 1.40 to 2.76. Measured amounts of montmorillonite, kaolinite, volcanic ash, or feldspathi…
View article: Effects of organic solutes on chemical reactions of aluminum
Effects of organic solutes on chemical reactions of aluminum Open
Concentrations of organic matter in the general range of 1-10 milligrams per litre organic carbon are common in natural water, and many naturally occurrin7 organic compounds form aluminum complexes. The aluminum concentrations in near-neut…
View article: Chemical interactions of aluminum with aqueous silica at 25 degrees Celsius
Chemical interactions of aluminum with aqueous silica at 25 degrees Celsius Open
Solutions containing from 10 -5 to 10 -2 moles per liter of aluminum and dissolved silica in various ratios were aged at pH levels between 4 and 10 at 25?C. A colloidal amorphous product having the composition of halloysite was produced in…
View article: Effect of aging on aluminum hydroxide complexes in dilute aqueous solutions
Effect of aging on aluminum hydroxide complexes in dilute aqueous solutions Open
Aqueous aluminum solutions containing 4?10 -5 mole/liter aluminum and a constant total ionic strength of 10 -2, but with varying ratios of hydroxide to aluminum (OH:Al), were prepared. Progress of these solutions toward equilibrium conditi…
View article: PREFACE
PREFACE Open
ADVERTISEMENT RETURN TO BOOKPREVFront MatterNEXTPREFACEJOHN D. HEMJOHN D. HEMU.S. Department of the Interior Geological Survey Menlo Park, California 94025 October 1970More by JOHN D. HEMDOI: 10.1021/ba-1971-0106.pr001 This publication is …
View article: Reconnaissance of selected minor elements in surface waters of the United States, October 1970
Reconnaissance of selected minor elements in surface waters of the United States, October 1970 Open
A nationwide reconnaissance of selected minor elements in water resources of the 50 States and Puerto Rico was made by the U.S. Geological Survey in cooperation with the U.S. Bureau of Sport Fisheries and Wildlife during autumn, 1970. Init…
View article: Study and interpretation of the chemical characteristics of natural water
Study and interpretation of the chemical characteristics of natural water Open
The chemical composition of natural water is derived from many different sources of solutes, including gases and aerosols from the atmosphere, weathering and erosion of rocks and soil, solution or precipitation reactions occurring below th…
View article: Solubility of aluminum in the presence of hydroxide, fluoride, and sulfate
Solubility of aluminum in the presence of hydroxide, fluoride, and sulfate Open
The total concentration of aqueous dissolved species of aluminum that will be present in equilibrium with microcrystalline gibbsite at various levels of complexing ligand concentration are shown graphically. The graphs can be used to estim…
View article: Graphical methods for studies of aqueous aluminum hydroxide, fluoride, and sulfate complexes
Graphical methods for studies of aqueous aluminum hydroxide, fluoride, and sulfate complexes Open
Diagrams showing extent of complexing.Effects of hydroxide._____________
View article: Form and stability of aluminum hydroxide complexes in dilute solution
Form and stability of aluminum hydroxide complexes in dilute solution Open
Laboratory studies of solutions 4.53 x 10 -4 to 4.5 x 10 -5 molal (12.2-1.2 ppm) in aluminum, in 0.01 molal sodium perchlorate, were conducted to obtain information as to the probable behavior of aluminum in natural water. When the solutio…
View article: Reduction and complexing of manganese gallic acids
Reduction and complexing of manganese gallic acids Open
Tannic (digallic) and gallic acids form 1:1 complexes with Mn+2 in dilute solution.The stability constant of the digallic complex was determined to be 103 -9 by spectrophotometric studies.Water solutions of tannic and gallic acid can bring…
View article: Deposition and solution of manganese oxides
Deposition and solution of manganese oxides Open
Bl atural occurrence of manganese__________________________________Manganese in soil and plants____________________________________ Manganese in river water.._____________________________________ Streambed manganese oxide deposits______---…
View article: Chemical equilibria and rates of manganese oxidation
Chemical equilibria and rates of manganese oxidation Open
Aims and organization of study____.________________________________Occurrence and chemical properties of manganese____________________ Nature and significance of stability-field diagrams-____________________ Chemical-equilibrium computatio…
View article: Reconnaissance of Headwater Springs in the Gila River Drainage Basin, Arizona
Reconnaissance of Headwater Springs in the Gila River Drainage Basin, Arizona Open
The springs in the Mogollon Rim region in central Arizona are the source of much of the water in the Gila, Salt, and Verde Rivers.The ground-water resources of the region had not previously been studied systematically.The Mogollon Rim is a…
View article: Some effects of the larger types of aquatic vegetation on iron content of water
Some effects of the larger types of aquatic vegetation on iron content of water Open
Page TABLE 1. Chemical analyses of
View article: Microbiologic factors in the solution and transport of iron
Microbiologic factors in the solution and transport of iron Open
FIGURE 21.Plants of low iron content used as organic admixtures.-______219 22. Plants of high iron content used as organic admixtures------TABLESTABLE 1. Iron content of sand, soil, and organic matter used in laboratory study._____________…
View article: Restraints on dissolved ferrous iron imposed by bicarbonate redox potential, and pH
Restraints on dissolved ferrous iron imposed by bicarbonate redox potential, and pH Open
Purpose and scope_________________________________________________ Chemical equilibria in ground water_________________________________ Sources of hydrogen ions_ ______________________________________ Sources of carbon dioxide in natural w…
View article: Some chemical relationships among sulfur species and dissolved ferrous iron
Some chemical relationships among sulfur species and dissolved ferrous iron Open
Chemical equilibria involving sulfur and iron in ground water.__________ Stability fields for dissolved sulfur species___________________---__--_--Solubility diagram for ferrous sulfides_
View article: Complexes of ferrous iron with tannic acid
Complexes of ferrous iron with tannic acid Open
Analytical procedures__________________________________________ Chemical reactions in test solutions._____________________________No tannic acid____________________
View article: Coprecipitation effects in solutions containing ferrous, ferric, and cupric ions
Coprecipitation effects in solutions containing ferrous, ferric, and cupric ions Open
_______________________________________________________Occurrence of ferric hydroxide
View article: Survey of ferrous-ferric chemical equilibria and redox potentials
Survey of ferrous-ferric chemical equilibria and redox potentials Open
Amounts of iron in solution in natural water at equilibrium are related to the pH and Eh of the solution.Important ionic species present include Fe+++, FeOH++, Fe(OH)+2, Fe++, and FeOH+.A stability field diagram shows the Eh and pH values …
View article: Study and interpretation of the chemical characteristics of natural water
Study and interpretation of the chemical characteristics of natural water Open
The chemical composition of natural water is derived from many different sources of solutes, including gases and aerosols from the atmosphere, weathering and erosion of rocks and soil, solution or precipitation reactions occurring below th…
View article: Quality of water, Conchas Reservoir, New Mexico, 1939-49
Quality of water, Conchas Reservoir, New Mexico, 1939-49 Open
Page PLATE 6. Aerial view northwest, main section of Conchas Dam__________ FIGTJBE 11.Map of Canadian River drainage basin.___________________12. Map of Conchas Reservoir with water level at 4,201 feet___ 13.Specific conductance of composi…
View article: The industrial utility of public water supplies in the Mountain States, 1952
The industrial utility of public water supplies in the Mountain States, 1952 Open
The location of industrial plants is dependent on an ample water supply of suitable quality. Information relating to the chemical characteristics of the water supplies is not only essential to the location of many plants but also is an aid…
View article: Use of water by bottom-land vegetation in lower Safford Valley, Arizona
Use of water by bottom-land vegetation in lower Safford Valley, Arizona Open
Lower Safford Valley, Graham County, Ariz., is an alluvial lowland plain 1 to 3 measurements, and the rate of ground-water inflow to the bottom-land area was determined on the basis of the hydraulic gradient, of the water table at. the tim…
View article: Quality of water of the Gila River basin above Coolidge Dam, Arizona
Quality of water of the Gila River basin above Coolidge Dam, Arizona Open
Expression of results_________________________________________-_____ Sources of dissolved matter in surface and ground waters.__-_____-___-_Common constituents of the dissolved matter.____________________Soluble matter in hard rocks_______…