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Leslie A. Sparrow - One of the best experts on this subject based on the ideXlab platform.

  • PartitIoning of metals to sediment organic carbon
    Environmental Toxicology and Chemistry, 1996
    Co-Authors: John D. Mahony, Dominic M. Di Toro, Adrian M. Gonzalez, Mark Curto, Maureen Dilg, Laurie D. De Rosa, Leslie A. Sparrow
    Abstract:

    The partitIon coefficients and sorptIon capacities for cadmium, copper, and lead in freshwater sediments are derived from fitting a Langmuir isotherm to data from 14 sediments. The metal activity in the solutIon phase was measured using Specific Ion Electrodes. The metal sorptIon due to acid-volatile sulfide was subtracted from the total sorbed metal to produce the metal bound to other sediment phases. Organic carbon normalized isotherms provide a reasonable representatIon of the metal sorptIon. PartitIon coefficients and capacities are calculated for pH = 6, 7, and 8 (for Cd). The organic carbon normalized isotherm parameters for the sediments are compared to those reported for soils and sludges. The comparisons for cadmium exhibit differences for which no ready explanatIons are available. For copper and lead, however, the differences can be attributed to the use of Specific Ion Electrodes for measuring metal activity in the sediment experiments. The cadmium sediment partitIon coefficients contribute a small increment to the sediment quality criteria. For copper and lead, however, the additIonal binding to sediment organic carbon is significant and can amount to 1 to 10 and 10 to 100 μmol/g dry weight for lead and copper, respectively, depending on the organic carbon concentratIon of the sediment.

Rf Eherts - One of the best experts on this subject based on the ideXlab platform.

  • EvaluatIon of Power Plant Measurement of Sodium Ions in High-Purity Main Steam and Feedwater Utilizing In-Line Continuous Specific-Ion Electrodes
    Power Plant Instrumentation for Measurement of High-Purity Water Quality, 1
    Co-Authors: Rf Eherts
    Abstract:

    The measurement of trace-level sodium concentratIons in aqueous solutIons is discussed. A comparison between the Specific-Ion electrode analyzer and other analytical methodologies is presented. The techniques include atomic absorptIon spectroscopy, flame emissIon spectroscopy, and Ion chromatograhy. The data were obtained over approximately a 300-day period utilizing combinatIons of the aforementIoned analytical techniques. The evaluatIon was performed at Calvert Cliffs Nuclear Power Plant (CCNPP), Lusby, Md., a pressurized water reactor owned and operated by Baltimore Gas and Electric Co. (BGandE). The data revealed that significant perturbatIons in the indicated sodium concentratIons on the Specific-Ion electrode analyzers existed during the study period. Based upon the comparison data obtained by other analyticaly methodologies, the indicated sodium level variances were not considered to be representative of the actual system concentratIon variances. The perturbatIons in the indicated sodium levels were correlated with flow-pressure fluctuatIons in the Specific-Ion electrode sample lines. In additIon, the accuracy of the instrument was diminished as the actual system sodium concentratIon varied outside the calibratIon limits of the analyzer. 7 refs.

John D. Mahony - One of the best experts on this subject based on the ideXlab platform.

  • PartitIoning of metals to sediment organic carbon
    Environmental Toxicology and Chemistry, 1996
    Co-Authors: John D. Mahony, Dominic M. Di Toro, Adrian M. Gonzalez, Mark Curto, Maureen Dilg, Laurie D. De Rosa, Leslie A. Sparrow
    Abstract:

    The partitIon coefficients and sorptIon capacities for cadmium, copper, and lead in freshwater sediments are derived from fitting a Langmuir isotherm to data from 14 sediments. The metal activity in the solutIon phase was measured using Specific Ion Electrodes. The metal sorptIon due to acid-volatile sulfide was subtracted from the total sorbed metal to produce the metal bound to other sediment phases. Organic carbon normalized isotherms provide a reasonable representatIon of the metal sorptIon. PartitIon coefficients and capacities are calculated for pH = 6, 7, and 8 (for Cd). The organic carbon normalized isotherm parameters for the sediments are compared to those reported for soils and sludges. The comparisons for cadmium exhibit differences for which no ready explanatIons are available. For copper and lead, however, the differences can be attributed to the use of Specific Ion Electrodes for measuring metal activity in the sediment experiments. The cadmium sediment partitIon coefficients contribute a small increment to the sediment quality criteria. For copper and lead, however, the additIonal binding to sediment organic carbon is significant and can amount to 1 to 10 and 10 to 100 μmol/g dry weight for lead and copper, respectively, depending on the organic carbon concentratIon of the sediment.

Benton J Jones - One of the best experts on this subject based on the ideXlab platform.

  • laboratory guide for conducting soil tests and plant analysis
    2001
    Co-Authors: Benton J Jones
    Abstract:

    Preface INTRODUCTIon Reference Methods Reagents, Standards, and Water Elemental and Compound DesignatIon Other ConsideratIons InterpretatIon of a Soil Test/Plant Analysis Result Units Disclaimer SOIL ANALYSIS (TESTING) History and Purpose Sequence of Procedures Sampling Transport to the Laboratory PreparatIon of the Laboratory SampleWeighing versus Scooping Sample Aliquot DeterminatIon Laboratory Factors Long-Term Storage Soil pH Soil Buffer pH Extractable ElementsPhosphorus Major CatIons (K, Ca, Mg, and Na) Micronutrients (B, Cl, Cu, Fe, Mn, and Zn) Trace Heavy Metals Extractable Nitrate-Nitrogen Extractable Sulfate-Sulfur Testing Organic Soils and Soilless Media Organic Matter and Humic Matter Content DeterminatIons Soluble Salt DeterminatIon Soil Texture (Mechanical Analysis)Special Tests Testing Organic Soils and Soilless Media Total Analysis PLANT ANALYSIS Purpose Sampling Sample PreparatIonPlant Tissue PreparatIon Elemental Analysis for the Mineral Elements Total Nitrogen DeterminatIon Total Sulfur DeterminatIon Methods for Expressing Elemental Content InterpretatIon of Results DecontaminatIon Oven Drying Grinding Organic Matter DestructIon Laboratory Analysis of Plant Digest Extractable Elements TISSUE TESTING IntroductIon Testing Kits PreparatIon of Reagents for ConductIong Tissue Tests Using Filter Paper Sampling Techniques Testing Procedures Methods of InterpretatIon Use of a Specific-Ion Nitrate Meter Sources for Kits and Instruments PRINCIPLES OF INSTRUMENTAL ANALYSIS IntroductIon UV-VIS Spectrophotometry (Colorimetry) EmissIon SpectroscopySpectrophotmetryAtomic AbsorptIon Spectroscopy Specific Ion Electrodes pH and Specific-Ion Electrodes Ion Chromatoraphy QUALITY ASSURANCE/QUALITY CONTROL IN THE LABORATORY IntroductIonMethodology DocumentatIon Accuracy and PrecisIon Standards InstrumentaIon Laboratory Procedures ParticipatIon in Proficiency Testing Programs APPENDICES Lists of Reagents, Standards, ph Buffers, Acids, Indicators, and PreparatIon of Standard Acids, Bases, and Buffers Standards and Standard PreparatIon ExtractIon Reagents and Procedures The North American Proficiency Testing Program for Soil, Plant, and Water Analysis Laboratories (NAPT) ASI ExtractIon Reagent Method for Soil Analysis Reference Texts DefinitIons ConversIon Factors Each chapter also contains a references sectIon.

Dominic M. Di Toro - One of the best experts on this subject based on the ideXlab platform.

  • PartitIoning of metals to sediment organic carbon
    Environmental Toxicology and Chemistry, 1996
    Co-Authors: John D. Mahony, Dominic M. Di Toro, Adrian M. Gonzalez, Mark Curto, Maureen Dilg, Laurie D. De Rosa, Leslie A. Sparrow
    Abstract:

    The partitIon coefficients and sorptIon capacities for cadmium, copper, and lead in freshwater sediments are derived from fitting a Langmuir isotherm to data from 14 sediments. The metal activity in the solutIon phase was measured using Specific Ion Electrodes. The metal sorptIon due to acid-volatile sulfide was subtracted from the total sorbed metal to produce the metal bound to other sediment phases. Organic carbon normalized isotherms provide a reasonable representatIon of the metal sorptIon. PartitIon coefficients and capacities are calculated for pH = 6, 7, and 8 (for Cd). The organic carbon normalized isotherm parameters for the sediments are compared to those reported for soils and sludges. The comparisons for cadmium exhibit differences for which no ready explanatIons are available. For copper and lead, however, the differences can be attributed to the use of Specific Ion Electrodes for measuring metal activity in the sediment experiments. The cadmium sediment partitIon coefficients contribute a small increment to the sediment quality criteria. For copper and lead, however, the additIonal binding to sediment organic carbon is significant and can amount to 1 to 10 and 10 to 100 μmol/g dry weight for lead and copper, respectively, depending on the organic carbon concentratIon of the sediment.