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Summary Analytes Revision Data and Sites. Official Method Name. It contains approved ASTM standards and related materials. The methods in this volume are applicable for sampling and analysis of water, waterborne materials and wastes, water-formed deposits and fluvial sediments, surface water hydraulics and hydrologic measurements.
This method has 7 analytes associated with it. Chloride Chloride Chloride ion. Fluoride Fluoride. Phosphate Orthophosphate Orthophosphate, total Phosphate Phosphorus as phosphate Phosphorus, phosphate, ortho Reactive phosphorus Total orthophosphate Total phosphorus.
Sulfate Sulfate Sulfate as ion Sulphate as ion. The Water Quality Portal contains sample results from sites that use this method. Select data: Sites only Sample results only. Sites where this method was used. An aliquot of sample is injected into an ion chromatograph. The sample is pumped through two columns and a suppressor device and into a conductivity detector.
The analytical column and the guard column are packed with low-capacity anion exchanger. Ions are separated based on their affinity for the exchange sites of the resin. The suppressor device contains a fiber or membrane based cation exchanger which is continuously regenerated by a flow of dilute sulfuric acid. The suppressor device reduces the background conductivity of the eluent to a low or negligible level by replacing the cations with the hydrogen ion, thereby converting the anions in the sample to their corresponding acids.
The separated anions in their acid form are measured using an electrical-conductivity cell. Anions are identified based on their retention times compared to known standards. Quantitation is accomplished by measuring the peak height or area and comparing it to a calibration curve generated from known standards. This test method covers the sequential determination of fluoride, chloride, nitrite, ortho-phosphate, bromide, nitrate, and sulfate ions in water by chemically suppressed ion chromatography.
Since chloride and nitrite elute very close together, they are potential interferents for each other. As with other types of chromatography, if one of the sample components is present at very high levels, it may interfere by causing a very large peak on the chromatogram which could mask other peaks present. Water from the sample injection will cause a negative peak or dip in the chromatogram when it elutes, because its conductivity is less than that of the suppressed eluent.
Due to the effect of the water dip and the interference of organic acids and due to the presence of carbonate ions in the separator column, the user of this test method is urged to use caution when determining fluoride.
Collect the sample in accordance with D and D, as applicable. Analyze samples soon after collection. Preserve samples containing nitrite, nitrate, or phosphate by refrigeration at 4 degrees C. Filter samples containing particulates through a prewashed 0. The collaborative test of this test method was performed in reagent water, drinking water, and a wastewater of choice by 19 laboratories using one operator each.
Six levels of concentration were used for seven anions, producing three Youden pairs. Each Youden pair was used to calculate the single operator precision So. All data were obtained using a non-metallic pump surface to minimize potential metallic contamination to the analytical columns.
Historical Version s - view previous versions of standard. More D Additional anions, such as carboxylic acids, can also be quantified. See 6. The quantitation of unretained peaks should be avoided.
ASTM D4327 - 17
Lower detection limits have been observed with newer instrumentation, column technology and eluents. The analyst must assure optimum instrument performance to maintain a stable baseline at more sensitive conductivity full-scale settings. These limits may be extended by appropriate dilution or by use of a smaller injection volume. This is not the subject of this test method. This approval is based on acceptance by the U. EPA as referenced in Appendix X2.