ASTM D3921 PDF

A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. Terminology 1. Similarly, this method, refer to Terminology D and Practices E However, these evaporative ing in solution after contact with silica gel and measured by losses are generally much lower than those experienced with this test method.

Author:Kajiramar Dimi
Country:Iraq
Language:English (Spanish)
Genre:Spiritual
Published (Last):26 April 2012
Pages:219
PDF File Size:14.55 Mb
ePub File Size:10.31 Mb
ISBN:227-1-24815-987-5
Downloads:57139
Price:Free* [*Free Regsitration Required]
Uploader:Malabei



A number in parentheses indicates the year of last reapproval. Asuperscript epsilon e indicates an editorial change since the last revision or reapproval.

This standard has been approved for use by agencies of the Department of Defense. Similarly, thistest method defines petroleum hydrocarbons in water and wastewater as that oil and grease which is not adsorbed by silica gelin the test method and that is measured by infrared absorption.

However, these evaporativelosses are generally much lower than those experienced withgravimetric procedures that require solvent evaporation beforethe residue is weighed.

It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. Referenced Documents2. Summary of Test Method4.

A majorportion of the remaining extract is contacted with silica gel toremove polar substances, thereby providing a solution ofpetroleum hydrocarbons.

This treated extract is then similarlyexamined by infrared spectroscopy. Significance and Use5. Regulations and standards have been established that requiremonitoring of oil and grease in water and waste water. Current edition approved Jan. Published January Originallyapproved in Last previous edition approved in as D — Interpretation of testresults on the basis of chemical structure, pollution potential, ortreatability should be approached with caution, however, be-cause of the diversity of substances measured by this proce-dure.

Ofthose measured, certain ones may be adsorbed by silica gelwhile others may not. Those which are not adsorbed aremeasured as petroleum hydrocarbons. Unless otherwise indicated, it is intended thatall reagents shall conform to the specification of the Committeeon Analytical Reagents of the American Chemical Society,7where such specifications are available.

Other grades may beused, provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use without lessening theaccuracy of the determination. Check for such contamination by evaporating mL of solvent in a steam bath and weighing its residue. If this valueexceeds 0. Store the purified solvent in clean, glass bottleshaving TFE-Fluorocarbon cap liners.

Purification of this solvent as amatter of course is highly desirable. Usethe entire sample since no portion should be removed for othertests. The amount of reagent required will bedependent upon the pH of the sample at the time of collectionand upon its buffer capacity.

The preferred material is a sample of the same oil and grease that is knownto be present in the sample of water or waste water awaiting analysis. Theother material is a mixture of isooctane and cetane. This latter blend is tobe used when the same as described material is not available. Mix the contents well and maintain the integrity of the mixtureby keeping the container tightly sealed except when a portionis withdrawn for blending. Tothis flask quickly add about 1 mL of either the calibration oiland grease or the calibration mixture of isooctane and cetane.

Obtain its exact weight by difference. Pharmaceutical Convention, Inc. Other available types from the same or different suppliers may besuitable. D — 96 e12solvent and mix the liquid well by shaking the flask. If the calibration oil and grease is used,proceed to NOTE 3—Dating back to at least ,10for many years a mixture ofisooctane, cetane, and benzene was accepted as a standard for calibration.

Tomaintain relevance between current and future analytical data with thoseof the past, it is necessary to compensate for differences in concentrationand in density between the former and the present calibration standards.

The factor of 1. Henceforth, all concentra-tions involving the calibration mixture will be based upon the convertedvalue obtained in NOTE 4—During the calibration events which follow, the cell used forthe blends must be thoroughly cleaned with fresh solvent and then driedprior to the addition of a new blend.

Take care to avoid insertion of the cellstopper so tightly that the cell could burst from expansion of its contentsas it resides in the light beam. It is desirable to flush the cell compartmentof the spectrometer with nitrogen or dry air to prevent chemical reactionof solvent fumes with components of the instrument.

For double-beamoperation, either block the light beam from the reference cell containingsolvent or remove the reference cell from the instrument during theintervals between scans in order to protect the solvent from unnecessarywarming. However, place the reference cell in the reference beam duringall scans. For single-beam operation, use the same cell throughout thecalibration procedure.

Rely upon sole recommendations of the manufac-turer for single-beam and nondispersive infrared analyzers since variationsin design make it impractical to offer instructions for their use with thismethod. A nearly horizontal, straight lineshould be obtained. If it is not, check cells for cleanliness,matching, etc. Drain and clean the sample cell. Obtain spectraldata for the solvent at this time for single-beam and nondis-persive infrared instruments, also. After running, drain, andclean the sample cell.

Scan as in Obtain net values for single-beam andnondispersive infrared runs as recommended. NOTE 5—For infrared instruments having computer capability, datamay be obtained automatically or as described in

PFINDER REAL-TIME TRACKING OF THE HUMAN BODY PDF

ERACHECK PRO

A number in parentheses indicates the year of last reapproval. Asuperscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. Similarly, thistest method defines petroleum hydrocarbons in water and wastewater as that oil and grease which is not adsorbed by silica gelin the test method and that is measured by infrared absorption. However, these evaporativelosses are generally much lower than those experienced withgravimetric procedures that require solvent evaporation beforethe residue is weighed. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.

DER PAPALAGI PDF

Revolution in Oil in Water Measurement: Withdrawn ASTM D3921 gets replaced by CFC-free ASTM D7678

Nagami Similarly, this test method defines petroleum hydrocarbons in water and waste water as that oil and grease which is not adsorbed by silica gel in the test method and that is measured by infrared absorption. Do you like or dislike what you have read? Analytical Instrumentation Anton Paar has launched Dianathe ideal solution for automatically performing high-precision distillation range analysis at atmospheric pressure. Stay on Page Continue to Compass. Jul 17 Read New, robust and user-friendly general purpose monitor Dec 17 Read Therefore the infrared test methods using CFC solvents had to be replaced by time-consuming gravimetric methods e. Miniature spectrometer spearheads development of a n Safe and reliable pressure calibration and pressure Trending Articles Risks and side effects The underestimated dang Atmospheric distillation unit offers perfection from Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. As the extraction solvent the ozone layer depleting chemical Freon is used.

Related Articles