Find the most up-to-date version of ASTM D at Engineering 27 May ASTM D_能源/化工_工程科技_专业资料。ASTM D Standard Test Method for Determination of Water in Liquid Petroleum. ASTM D () Standard Test Method for Determination of Water in Liquid Petroleum Products by Karl Fischer Reagent (Withdrawn ).
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Toggle navigation Toggle search. Large current background compensation. However, due to solubility and reactivity issues described above, analysts often drastically reduce sample size, which tends to reduce astj reproducibility of test results. Standby time can be shortened to be less than 10 minutes. Typical questions asked about products:. In two-component KF, the titrant contains only an alcoholic solution of iodine, while the solvent contains the other ingredients needed for the reaction.
Recommended Sample Sizes for KF Analysis Sample Size Selection For both direct and indirect KF methods, sample size selection is critical for minimizing errors associated wstm sample weighing, transfer and injection. Gold Member Since Send your message to this supplier. That is, while the iodine in the KF reagent is reacting with water, there is no free iodine present in the titration cell, and a high voltage is required to maintain the set polarization current at the double platinum pin indicator electrode.
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. Dean Stark Distillation Apparatus. Visual indication is reliable for quantifying water content only in the free state, while the hot plate crackle test can be used to detect free and emulsified water.
Since its invention by German petroleum chemist Dr.
Fundamentals of Volumetric Karl Fischer Titration. Find Similar Products By Category. Coulometric KF is most accurate in the range of 1 ppm to 5 aastm water. And it is widely applied to petroleum, chemical engineering, pharmacy, electricity, scientific research, education department and so on.
The technique also offers d11744 substantial advantages over more conventional hot plate crackle test and distillation methods, and it has been incorporated into numerous ASTM standards. Corresponding reduction of hydride to hydrogen takes place at the cathode. Learning Outcomes By the end of this course you will be able to: Finding the Source of Water Contamination in Oil. Volumetric or coulometric Wstm methods, utilizing either direct titration or the oil evaporator technique, can be used to quantify water in oil samples from trace amounts to percent.
Software adjusting stirring speed; selection between 0 to Identify the significance of water presence in petroleum products Define the Karl Fisher technique Identify the importance of proper standardization of Karl Fisher reagents Follow the procedural steps outlined in ASTM D Audience Anyone who runs the D test method or who needs an understanding of the test method and how it is properly run.
Modern Instrumental Methods and Techniques. Get Latest Price Min.
You have seen all photos. Self-guided training complete with video demonstrations, checklists, concept presentations, data sheets and glossaries Quiz with automatic grading Certificate upon successful completion of course and passing score on the quiz.
Current Issue Archive Advertise. Used oils may also contain contaminants that can potentially interfere with direct KF analysis, such as trace metals, polyaromatic hydrocarbons, polychlorinated biphenyls, as well as various products of incomplete combustion.
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ASTM D1744 Coulometric Karl Fischer Titrator (TP-2100)
With both types of volumetric KF, imidazole is the base used most frequently as a buffer to maintain optimal pH for the reaction. Alternatively, specially preformulated KF reagents incorporating one or several of these solvents are commercially available for both volumetric and coulometric KF.
Distillation methods, such as ASTM D95 and D provide better quantitative data in the range of approximately ppm to 25 percent, but require large sample sizes and involve long analysis times, typically 60 to minutes.
Coulometric KF is considered an absolute method because time and current axtm both be accurately measured.
Analyzing Water in Oil
Adopt a microprocessor for control, so it has characteristics of aastm determination speed, high precision, LCD display, and automatic print. It is a multifunctional, convenient, and automatic analysis instrument.
The procedure involves adding the oil sample to the solvent present in the evaporation chamber where it dissolves in the solvent, and in the process forms a binary azeotrope between the solvent and the sample’s water content. Rotating Speed Control Enter d11744 20 to 4, characters. Sample Size and Reproducibility As with any analytical technique, the sampling error in KF analysis is inversely proportional to the sample size.
The following reactions represent this two-step mechanism. Certificate Program This training course is part of the zstm certificate program s:. In other words, the larger the sample, the less error is introduced into the analysis by sample weighing, transfer and other handling.