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Use of Automated Combustion Techniques for Total Carbon Total Nitrogen and Total Sulfur Analysis of Soils1 -- Fluorometry and Nephelometry: Techniques and Uses in Soil Plant and Water Analysis -- Gas Chromatography: Techniques and Uses in Soil Plant and Water Analysis1 -- Atomic Absorption and Flame Photometry: Techniques and Uses in Soil Plant and Water Analysis -- Neutron Activation: Techniques and Possible Uses in Soil and Plant Analysis -- Electron Microprobe: Techniques and Uses in Soil and Plant Analysis1 -- Specific Ion Electrodes: Techniques and Uses in Soil Plant and Water Analysis -- X-Ray Emission Spectrograph: Techniques and Uses for Plant and Soil Studies1 -- Simultaneous Determinations of Phosphorus Potassium Calcium and Magnesium in Wet Digestion Solutions of Plant Tissue by AutoAnalyzer1 -- Determination of Phosphorus Potassium Calcium and Magnesium Simultaneously in North Carolina Ammonium Acetate and Bray P1 Soil Extracts by AutoAnalyzer1 -- Front Matter.
Theoretical principles; Instrumentation and technique; Flame photometry applied to the individual elements; Applications.
"A second-generation flame spectometer for the direct determination of phosphorus in water was evaluated. Response to phosphorus in the form of phosphoric acid was linear from 0.5 to 16 ppm phosphorus. The relative standard deviation was approximately constant at 20 percent over the range. River water and municipal sewage effluent were analyzed after the addition of phosphoric acid (1.8 ppm P) and filtration through a series of microporous membranes. Recovery of the added phosphorus averaged 70 percent for the river water and 95 percent for the sewage effluent after treatment with cation exchange resin. There was no clear relation to filter pore size in the range 5 to 0.2 micrometers. Analyses of the higher range EPA Nutrient Reference Samples (approximately 0.5 ppm P) agreed within one standard deviation with the reference values, both for inorganic and total phosphorus. The lower concentration range samples (approximately 0.1 ppm P) gave barely detectable signals. Suggestions are given for further development of the instrument. -- Abstract