of Petroleum and Petroleum Products (ASTM Practice. D ). MPMS Chapter Determination of Water in Crude Oil by the Distillation Method (ASTM Test. ASTM D Standard Test Method for WATER IN PETROLEUM PRODUCTS AND BITUMINOUS MATERIALS BY DISTILLATION. ASTM D Standard Test Method for Water in Petroleum Products and Bituminous Materials by Distillation.
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No further reproductions authorized. The condenser tube and trap must be chemically clean to ensure free drainage of water into the bottom of the trap. Modern Instrumental Methods and Techniques. Coulometric KF is considered an absolute method because time and current can both be accurately measured.
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Astm D95 Water Content Distillation. Sample Size and Reproducibility As with any analytical technique, the sampling error in KF analysis is inversely proportional to the sample size.
In coulometry, the quantity of iodine generated corresponding to the amount of water present is calculated by the titrator on the basis of current mA and time sec. The technique also offers other substantial advantages over more conventional hot plate crackle test and distillation methods, and it has been incorporated into numerous ASTM standards.
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As a guideline, sample sizes shown in Table 1 are recommended for volumetric and coulometric KF, respectively. We have 12 months d9, if it broken during transport, we can change a new one for you. D95 — 05 the case of Style E; 0. Supplier Types Trade Assurance.
Read the volume of the water in the trap to the nearest scale division. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. The still, trap, and condenser may be connected by any suitable method that produces a leakproof joint. Relevancy Transaction Level Response Rate. Types of Titration Volumetric KF Volumetric KF proceeds in the conventional manner of a classic titration, in that the titrant containing iodine is added mechanically to the solvent containing the sample by the titrator’s burette Figure 1.
Volumetric or coulometric KF methods, utilizing either direct titration or the oil evaporator technique, can be used to quantify water in oil samples from satm amounts to percent. The assembly of the astmm is satisfactory only if the d59 readings are within the tolerances speci? D95 — 05 ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
Asphalt moisture is water quantity of the asphalt sample, expressed by quality percentage. Finding the Source of Water Contamination in Oil. Only representative samples obtained as speci? HZWS-2 astm d95 petroleum products karl fischer trace water tester.
Apparatusfor Water Content in Petroleum Products. This standard has been approved for use by agencies of the Department of Defense.
If the metal still is used, start heating with the ring burner about 76 mm 3 in. High water content of lubricating oils negatively impacts the operation and longevity of the oils and the mechanical equipment components being lubricated.
Key Components of a Modern Volumetric KF Titrator Coulometric KF In coulometric KF, the iodine needed by the KF reaction is not present in the KF reagent, but is instead generated electrochemically in situ from iodide at the anode of the generator electrode, a component of the coulometric titration cell Figure 2.
Bangkok pursuant to License Agreement. A number in parentheses indicates the year of last reapproval. In one-component KF, the titrant usually referred to as a CombiTitrant or a composite contains all the ingredients needed for the KF reaction, namely iodine, sulfur dioxide, base and a suitable alcohol, while the solvent is typically dry methanol.
When complete, discard the contents of the trap and add the volume of water as speci? These include corrosion, erosion, etching and hydrogen embrittlement. Reactivity Certain compounds in the oil will undergo interfering side reactions either with methanol or iodine components of KF reagents.
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The subsequent oxidation of the alkylsulfite salt to an alkylsulfate salt by iodine consumes water in a d59 The KF method does not suffer from the same issues and limitations associated with the other techniques described above, and a number of recent advances in titrator instrumentation and reagent formulations have further improved the accuracy and reproducibility of KF analyses. Drain the cylinder thoroughly after the sample transfer and each rinsing.
Coulometric KF In coulometric KF, the iodine needed by the KF reaction is not present in the KF d955, but is instead generated electrochemically in situ from iodide at the anode of sstm generator electrode, a component of the coulometric titration cell Figure 2. A heater power indicator will illuminate when power is applied to the heater element.
Summary of Test Method 4. With both types of volumetric KF, imidazole is the base used most frequently as a buffer to maintain optimal pH for the reaction.
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If there is a persistent ring of water in the condenser tube, carefully increase the rate of distillation or cut off the condenser astn for a few minutes. Strategies for Removing Water from Oil. On assembly, care shall be taken to prevent the joints from freezing or sticking.
About product and sstm However, r95 cannot be completely removed from KF reagents, because the presence of alcohol is required by the mechanism of the KF reaction. NOTE 1—Volatile water-soluble material, if present, may be measured as water.
Coulometric KF is most accurate in the range of 1 ppm to 5 percent water. Always apply a very thin? Dislodge any drops of water adhering to the sides of the trap with a glass or polytetra? Once all the water has reacted with the iodine, trace quantities of free iodine appear in the titration cell, causing a drop in voltage necessary to keep the polarization current constant, which in turn signals the end-point of the titration.