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This section provides an overview for burets as well as their applications and principles. Also, please take a look at the list of 9 buret manufacturers and their company rankings. Here are the top-ranked buret companies as of January, 2025: 1.Metrohm, 2.Dynalab Corp., 3.NDS Technologies, Inc..
Table of Contents
Okayama University Graduate School, Ph.D. (Agriculture). After working as a specially appointed Assistant Professor at Tokyo Medical and Dental University, a fluid researcher at the Okayama Prefectural Institute of Biological Sciences, and a special researcher (JSPS PD) at the Japan Society for the Promotion of Japan Science, he became independent as a freelancer.
Specializes in natural product chemistry, protein engineering, fermentation engineering, and instrumental analysis of chemicals (especially mass spectrometry chemistry).
Thesis: https://pubmed.ncbi.nlm.nih.gov/?term=HIROKAZU+USUKI
linkedin: https://www.linkedin.com/in/%E5%8D%9A%E4%B8%80-%E8%87%BC%E6%9C%A8-b83827228/
A buret is a glassware that can measure the volume of liquid dropped by dropping a small amount of liquid while operating it with a cock.
A removable cock is attached to the bottom of a thin, tubular glass tube with a scale on it, and the amount of liquid dropped is adjusted by turning the cock.
A pipette can also be used to measure the volume of a dropped liquid, but the buret can be used in a vertical position, so the scale can be read more precisely and the amount of liquid can be adjusted finely with the cock. Moreover, since the volume of a drop can be precisely controlled with a cock, the buret is suitable for experiments that require accurate liquid volume measurement, such as neutralization titration.
Buret is mainly used for neutralization titration. Neutralization titration is a type of volumetric analysis, in which the concentration of a solution of unknown concentration is determined using a standard solution of known concentration and a solution of unknown concentration that reacts in proportion to the concentration of the standard solution.
The judgment of the neutralization reaction, the so-called endpoint, is determined by the color change of the mixed solution after dropping. Although the operation of the cock requires a certain degree of skill, an automatic operation called auto-buret is also available and is used for quality control in the food, pharmaceutical, and chemical industries.
Features of burets
Burets are available in white and brown. As with other glassware, some substances react with light, so the choice should be made according to the type of substance dissolved in the standard solution. For example, silver nitrate is photosensitive and must be used under a light-shielded condition, so a brown buret must be used when using it as a titrant.
Also, as mentioned above, it is important to become familiar with the buret's cocking operation. If the speed of dropping liquid from the buret is too fast, there is a possibility of adding more standard solution than the endpoint. In addition, it is necessary to grease the cock part for maintenance, and if maintenance is insufficient, liquid may leak, etc.
Furthermore, if the tip is chipped, it is impossible to accurately measure the volume, so it must be handled with care. Experiments have shown that even a scratch on the tip can change the volume per drop. It is also known that the volume of residual liquid in the buret changes the volume of the residual drop, so it is advisable to always use the buret from the top of the scale, which is the zero point.
Since the buret is glassware, repeated heating and cooling deforms it, which impairs the accuracy of its measurement volume. Therefore, heating and drying after washing should be avoided, and the buret should be dried at room temperature. For the same reason, the titrant to be placed in the buret should be a liquid with a constant temperature of about room temperature. The temperature of the titrant should be considered not only because it causes expansion and deformation of the buret, but also because the volume of the titrant is temperature-dependent. For this reason, the titrant should be at a constant temperature for accurate volume measurement.
Why co-wash a buret?
Co-washing is the process of washing a buret, a whole pipette, or another side vessel instrument (an instrument used to measure the volume of a liquid) with the solution to be weighed (the solution to be placed inside).
To avoid volume changes due to deformation of the instrument, side vessel instruments are usually not heated and dried in a dryer. After washing with tap water, they are rinsed with distilled water and washed with the solution to be weighed immediately before use.
The reason for co-washing is that the concentration of the sample solution decreases when the inner surface of the instrument is wet with water. On the other hand, if the sample solution itself is wet, the concentration does not change when the solution is added.
Since a buret is used to put in a solution of unknown concentration during titration, if the concentration of the solution changes inside the buret, it will be impossible to obtain an accurate concentration.
Also, if you co-wash the apparatus once used again, you can continue to use it without letting it dry out.
First, fill the buret about 1/5 of the way with a solution and wash the inner walls while turning the buret on its side. Next, turn the cock to let the solution out of the tip, wash the inner wall below the cock, and discard the remaining solution from the top. This process is repeated several times.
Fix the buret vertically to the buret stand and make sure the live plug is closed.
Using a funnel, pour the solution from the top of the glass tube. To prevent the solution from overflowing from the top of the funnel, leave a gap between the funnel and the top of the buret to allow air to escape. Also, to prevent the solution from getting into the eyes, pour the solution below eye level. After pouring the solution, remove the funnel.
Open the stopper with a beaker or other container underneath, and pour out the solution vigorously to completely expel air bubbles from the area below the stopper. If there are air bubbles above the stopper, remove them as well.
After the air has been expelled, read the scale and record the reading. The bottom (lower end) of the "meniscus" should be read, with the buret perpendicular to the line of sight. The meniscus is the curved surface of the liquid in a narrow tube due to surface tension, or a dent if the liquid wets the tube wall. The scale is read by eye to the nearest 1/10 of the smallest scale.
Turn the stopper to start dripping. Hold the buret with one hand and pull it toward the main body of the buret to prevent the stopper from falling out.
When titration is completed, read the scale to determine the volume to be titrated.
*Including some distributors, etc.
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NDS Technologies, Inc. was founded in 1990 with corporate headquarters in Vineland, New Jersey. The company is a developer, designer, and manufacturer of high-quality specialty glassware, plastic, and related products for scientific use in industry, government, and education. The company provides customer support, engineering, and manufacturing services to all customers and partners. The company provides a complete line of products from arsine generators to flasks to vials. The company offers manufacturing capabilities in many varieties of components such as chromatography, machining, and opto-electronics.
Dynalab Corp was founded in Rochester, New York in 1957. Together with its wholesale division, Dynalon Labware, Dynalab produces and distributes standard and custom-made scientific equipment and laboratory supplies across North America. Science equipment and sampling apparatus offerings include hygrometers, mailing point devices, rollers, water stills, powders, seals, various samplers, and drills. Some of Dynalab’s laboratory supplies include Azlon plastics, burn-up boxes, desiccators, hydrometers, pipettes, shields, stopcocks, tote boxes, tubing, and watch glasses.
SCILOGEX Liquid Handling Products and Bench-top Instruments are available through our authorized distributor network. To locate a distributor in your area please contact us. Our knowledgeable staff will be delighted to provide you with pre-purchase support and product recommendations.Our Liquid Handling Products come with a 1 year warranty and our Bench-top Instruments come with a 2 year warranty and are manufactured in an ISO9001 facility and cTUVus certified for UL & CSA so you can purchase in confidence. Please visit our New Products page frequently to keep up to date with new and exciting products and our Promotions page for the latest great deals we are offer.We thank you for your continued support and we look forward to bringing you new and exciting products at VERY competitive prices.
Metrohm, founded in 1943 and headquartered in Herisau, Switzerland, is a manufacturer of precision instruments for chemical analysis. They offer products such as dispensing tools, Stripping Analysis (CVS) instruments, ion chromatography systems, related accessories, and more. Their products cater to various sectors, including pharmaceuticals, chemicals, and defense, which are used for the analysis and handling of chemicals. Metrohmy holds IQNet and EcoVadis Silver Recognition award for sustainability and is compliant with GDPR standards.
Kanto Chemical Co. Inc., founded in 1944 and headquartered in Tokyo, Japan, is a reagent manufacturer with overseas affiliates in other countries, including China, France, USA, Taiwan, and Malaysia. Its product portfolio includes analytical reagents, ionic liquids, Iodine compounds, ultra-pure chemicals, and water analysis kits. The company is also developing regenerative medicine and genetics reagents and has over 50,000 products. It has several certifications, including ISO 9001, acquired in 1994, making it the first Japanese company in the reagent industry. Other certifications are ISO 14001, ISO 13485, and ISO/IEC 17025.
Sibata Scientific Technology Ltd, founded in 1921 at Saitama, Japan is a manufacturer of environmental measurement and occupational health measurement equipment. The company with global clientele produces various scientific measurement and analysis equipment that can range from lab glassware to synthetic reactors. The products line comprise of general lab equipment, extractor, synthetic reactor, Rotary Evaporator and Glass tube oven. These products are used in applications such as occupational safety, food hygiene, water hygiene, hospital and chemical plants as well. The products are ideal for testing quality, measuring dust, precise heating & cooling, personal exposure measurements and many more with more reliability.
Glaswarenfabrik Karl Hecht, founded in 1919, is a manufacturer and distributor of precision glass instruments and laboratory equipment based in Germany. The company offers a diverse range of laboratory and clinic consumables, practical devices and customer-specific glassware including glassware for diagnostics, volumetric instruments, and more. Their products find application in healthcare, laboratories, and clinics worldwide. The company holds ISO 9001 certification and serves clients worldwide backed by partners in Germany, France, Austria, and Switzerland, along with a network of global distributors.
Sun Platec is an ISO 9001-certified manufacturer and distributor of laboratory equipment and supplies that was established in Osaka, Japan, in 1960. The company offers laboratory equipment such as tubes and pipettes, and laboratory supplies such as wipes and tips. It also offers various containers including flasks and bottles, and polytetrafluoroethylene (PTFE) beakers and crucibles. The company’s products are commonly used in Asia’s educational and research institutions. Its clients include companies in the biotech, pharmaceutical, and food processing industries.
Ranking as of January 2025
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Metrohm |
16.3%
|
| 2 | Dynalab Corp. |
14.0%
|
| 3 | NDS Technologies, Inc. |
11.6%
|
| 4 | KANTO CHEMICAL CO.,INC. |
11.6%
|
| 5 | Scilogex, LLC |
9.3%
|
| 6 | GLASWARENFABRIK KARL HECHT GMBH & CO KG |
9.3%
|
| 7 | VEE GEE Scientific |
9.3%
|
| 8 | SIBATA SCIENTIFIC TECHNOLOGY LTD |
9.3%
|
| 9 | Sun Platec |
9.3%
|
Derivation Method
The ranking is calculated based on the click share within the buret page as of January 2025. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
United States of America
|
4 | 50.0% |
|
Japan
|
2 | 25.0% |
|
Switzerland
|
1 | 12.5% |
|
Germany
|
1 | 12.5% |
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