hawachscientific (hawachsci)
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Capsule Filters Introduction
Capsule filters, also known as the integrated filter, adopt fold-type inlet membrane, which has a large surface area and are suitable for the filtration of large-volume solutions. Capsule filters, which are made of polypropylene, are free of adhesives and other chemicals and are not meant to contaminate the sample. Types of capsule filters 1. RFPT filter capsules use hydrophobic polytetrafluoroethylene (PTFE) filter membrane; 2. RFPP filter capsules use hydrophilic polypropylene (PP) filter membrane; 3. RFPN filter capsules use nylon membrane. Features of capsule filters With housing, can be used directly, no stainless steel housing, cost savings. Simple installation, easy to use, reduce spatter and leakage. Available in various sizes and shapes (thread, hose, etc.) to meet a variety of conversion interface. Suitable for filtering 1-20 liters of laboratory filtration and all kinds of machine terminal filtration. Application of capsule filters 1. Prefiltration of reverse osmosis and ultrafiltration; 2. Filtration of aqueous and solvent samples; 3. Filtration of chemical industry ink and fuel, development fluid; 4. Filtration of viscous liquids in the food industry; 5. Filtration of corrosive liquids in the pharmaceutical industry.
about 21 hours ago from web -
How Does SPE Extraction Work During the Whole Process?
Activation, also known as solvation, add a suitable solvent to expand the functional groups on the adsorbent and remove possible interferences on the adsorbent. Equilibrium, remove the activated solvent to create a suitable solvent environment for sampling. Usually, use the same solvent of the sample solution. But for the ion exchange SPE cartridges, use the contrary solvent to the sample solution. Retention, when the sample solution passes through the adsorbent, and the force between the adsorbent and certain compounds exceeds the force between the latter and the solvent, the compounds are fixed by the adsorbent, thus called retention; washing, after sampling, some of the interfering substances are retained together with the target compound. It is necessary to add a suitable solution to remove the interferences to the greatest extent without affecting the retention of the target compound. Usually, the sample solvent for washing does not affect the recovery rate. Elution, the strong elution ability solvent passes through the adsorbent to interrupt the interaction between the adsorbent and the retained compound so that these compounds flow out from the adsorbent with the solvent. Usually, the elution solvent which can only elute the target compound is the best choice.
about 21 hours ago from web -
The Category of Sample Vial
Overview To determine the physical and chemical parameters of natural water, laboratory workers always use polyethylene and borosilicate glass sample vials for common sampling. Furthermore, it is better to use chemically inert material. The frequently-used sample vials have multiple types of narrow mouth, wild mouth and a screw cap with cork, rubber plug, and ground glass stopper. These sample vials are easy to buy. If the sample vials are packed in a case and sent to the laboratory for analysis, the case cover must be designed to prevent the corks from loosening, so that the samples will not be spilled or polluted. Sample Vial for Photoactive Substance In order to prevent some photoactive substances including algae from light, we mostly use opaque or colored glass vials and keep them in a dark place during storage. Sample Vial for Soluble Gas or Constituent When collecting and analyzing samples with a soluble gas, the components will be changed throughout aeration. Narrow-mouthed vial with cone ground glass stopper can reduce air absorption to a minimum limit. The most important is that special seal is required during transport. Sample Vial for Trace Organic Pollutant In general, as plastic sample vial will interfere with highly sensitive analysis, laboratory workers always use glass or polytetrafluoroethylene sample vial for trace organic pollutant.
about 22 hours ago from web -
What is HPLC Sample Vial
Sample vial is a necessary product for pollution detection and a qualified special instrument. Classification of sample vial 150ml, outer diameter 50mm* diameter 22mm* vial height 130mm; 250ml, outside diameter 70mm* diameter 30mm* vial height 140mm. Sample vial – application of sampling vial (filter vial) for particle counter 1. Used for the collection of liquid samples for particle pollution test; 2. Used for holding high cleaning reagents; 3. Used for holding granular standard substances and standard samples. Process of sample vial The special sample vial for particle counter is made by adopting a complete set of technological processes such as high-precision ultrasonic cleaning machine, 1000-level clean air shower, drying and sealing, etc. The sample vial cleanliness is a special sampling container for particle counter to test the liquid pollution degree. This kind of sample vial is suitable for sample collection of various liquid particle test, containing high cleaning reagent, particle type standard substance and standard sample.
about 22 hours ago from web -
How to Clean A Bottle-top Dispenser for Long-term Storage
Today, we’re going to show you how to clean a bottle-top dispenser. Before we get it started, let’s prepare a bottle of neutralization liquid, a bottle of distilled water, a bottle of the ethanol-glycerol mixture, a soft brush and a pipe cleaner. Now, let’s follow the steps below. Step 1: Attach the bottle-top dispenser to the neutralization liquid bottle to rinse the device with neutralization liquid. Step 2: Attach the product to the distilled water bottle and rinse the device with distilled water. Step 3: Detach the product, unscrew the piston mount and clean the piston and cylinder with the brush. Apart from this, you could also use the pipe cleaner to clean the tubes. Step 4: Rinse the product with distilled water after reassembling the device. Step 5: Rinse it with an ethanol-glycerol solution, the mixture of reagent grade non-denatured 99% ethanol and 1% glycerol. Step 6: Use the delivery box to pack the bottle-top dispenser for long-term storage. The device dries fast even when it’s packed in a box.
about a day ago from web -
Quick Start Manual of Hawach Bottle-Top Dispensers
Firstly, let’s divide those bottle-top dispensers into 3 groups according to their materials A. Highly corrosion resistant materials such as PTFE, PFA, boron silicate, platinum, etc. Application: Resistant to high-temperature sterilization (121℃), withstand most of the acid, alkali, organic and inorganic solvents; can be fine-tuned for different solvent physicochemical properties; three-function valve’s standard configuration recirculation function can avoid solution Waste, and unique wiper seal ring effectively reduces piston expansion and crystallization. B. Made of ETFE, FEP, PFA, PP material Applicable to general acid and alkali and low concentration of strong acid and alkali and salts, such as H3PO4, H2SO4, NaOH, KOH, etc. Maximum pressure 500 bar, maximum viscosity 500mm2/s, maximum temperature 40°C, and maximum liquid density is 2.2g/cm3. Easy to calibrate. C. Almighty / hydrofluoric acid dispenser Suit for hydrofluoric acid, strong acid, nicotinic acid, alkali, solvent, and extremely dangerous liquid. Integrated PTFE structure, no spring structure in drain valve, no corrosion and metal ion contamination reagents, suitable for trace analysis. Avoid leakage of niacin/odorous chemical liquid odor with a safety valve. We can also divide bottle-top dispensers into two big categories, one for biological laboratories and biological use. One for chemical, chemical engineering, trace analysis, and harsh environments.
about a day ago from web -
Production Principle And Performance Of PP Melt Blown Filter Cartridges
Hawach PP melt blown filter cartridges element is a tubular filter element made of non-toxic and odorless polypropylene particles which are heated, melted, spun, drawn and received. If the raw material is mainly polypropylene. It can be called PP spray filter. It is not only used in large quantities in water purification. It also has excellent chemical compatibility and is suitable for the filtration of strong acids, alkalis, and organic solvents. Strong dirt holding capacity, long service life, and low cost. 1. Production principle and characteristics The PP melt blown filter cartridges element is a tubular filter element made of non-toxic and odorless polypropylene particles which are heated, melted, spun, drawn and received. It has high cleanliness and no pollution to water quality. 2. Performance a. Acid, alkali and other chemical agents and organic solvents corrosion. b. Suitable for a wide range of media, can be filtered in a variety of different media. c. Can not recoil, regenerate, d. The low working pressure difference, 0.15-0.3MPa (forward) 3. Technical parameters a. Filtration accuracy: 1um-100um b. Filtration efficiency: 95% c. Working pressure: less than 0.4MPa d. Working temperature: not higher than 80 °C e. Flow: 0.3-50T / h 4. Application areas: a.Pharmaceutical industry: Pre-filtration of various injections, liquids, and injections of bottled water, pre-filtration of large infusions and various antibiotics and traditional Chinese medicine injections. b.Food industry: filtration of alcohol, beverages and drinking water. c.Electronics industry: Pre-filtration of pure water and ultrapure water. d.Petroleum and chemical industry: filtration of various organic solvents, acids, and lye, oilfield water injection filtration.
about a day ago from web -
The Maintenance of HPLC’s Plunger Rod and Plunger Piston Sealing Ring
Plunger piston sealing rings are divided into normal phase and reversed phase. The reversed-phase sealing ring is with the color of black and made of graphite. Normal phase sealing ring is orange and made of polyethylene, and it is more suitable to the normal phase solvent. Generally, the liquid chromatograph is equipped with a reversed-phase sealing ring. When normal phase is applied, the sealing ring should be changed into a normal phase. HPLC plunger piston sealing ring is covered on the plunger rod and used for isolating the pump from the outside. When working, the ring rubs with the rod frequently, and it will be frayed after a period of time. As a result, the plunger piston sealing ring should be changed regularly to ensure of airtightness of the system. You should check if there is a scratch on the plunger rod when changing the sealing ring. Because scratch will lead to slight leakage and reduce the service life of the sealing ring. Saline solution has a great influence on the service life of sealing ring. If the saline solution is used as the mobile phase system, you should pay attention to the wash of solution channel. Moreover, the saline solution cannot be kept in the pump after HPLC stops working.
about a day ago from web -
Three Types Of SPE Cartridges
SPE cartridge can be divided into three classes on the markets: silica-based cartridges, polymer-based cartridges, and adsorption-based cartridges. And here we talk about the three types of silica-based cartridges. The first type is the C18 cartridges. This kind of cartridges bond the octadecyl to the silica gel, that can make use of the non-polar interaction to the solid phase extraction. Because of highly–sealed which inhibit the interaction of the cation interchange caused by silanol group, they decreased adsorption of alkaline compounds. This kind of cartridges is the best choice when using non-polar interaction to extract substance in the experiments. The second one is the C8 cartridges. Compared with C18 cartridge, this kind of cartridges works on when the force of non-polar interaction is weak. It bonds the octyl group to the silica gel. The last one is NH2 cartridges. NH2 cartridge is SPE cartridge with silica gel bonded aminopropyl. The main interaction is the interaction of anion exchange and the polar interaction. The secondary interaction is non-polar interaction. They are usually used in removing the anionic compounds such as organic acids and sugars in herbicide residues.
about a day ago from web -
QuEChERS Solvent
Food safety testing is a major issue related to people’s livelihood. In recent years, the QuEChERS method has been widely used in the pretreatment of food safety detection samples. In addition, the method has been applied to trace analysis. QuEChERS Application The international application of QuEChERS method is very wide, not only limited to fruits, vegetables, and other plant agricultural products but also including all kinds of animal food and all kinds of complex processed food with high sugar content. In addition, the QuEChERS method has been widely used in various detection methods due to its advantages of good extraction effect and thorough purification. The target substance extracted is not limited to pesticides, and the detection instrument used is not limited to conventional gas and liquid chromatography. The QuEChERS method has also been applied to the detection of pesticide residues of traditional Chinese medicine, tea, and other products with Chinese characteristics. QuEChERS Solvents The QuEChERS method actually involves a liquid-liquid microextraction process. The sample is then purified to remove the matrix components that interfere with the chromatographic analysis. Acetonitrile is preferred as a QuEChERS solvent because it can extract a variety of compounds without extracting a large number of lipid-soluble substances.
about a day ago from web -
The Solution To Clarify Your Solvent And Sample – Syringe Filter
We can always hear such a conversation between those researchers. “Hey, buddy, what is your purity degree of the end products today?” “Damn it. Such a low degree that I cannot even use for the next step. Any better methods for clarifying raw materials?” Then there comes our syringe filter, a gospel for those scientific workers. Syringe filter use: Filter chemical turbid solution samples, most commonly used in chemical HPLC-MS/GC-MS analysis of liquid and gas dedusting, sterilization filtration, biological sample preparation, tissue culture media, microbial media, buffer solutions, etc. Remove impurities and so on. Think about it, why should the solvent and sample be filtered? Firstly, solvent and sample filtration are very important, it will protect the column and instrument, and eliminate the impact of pollution on the analysis results. Secondly, the packing particles are very thin, the column lumen is small, and the small particles in the solvent and sample make the column and capillary easy. Thirdly, solvents and fine particles in the sample increase clogging and wear of the injection valve and the sapphire piston rod in the pump head.
about 2 days ago from web -
Overview Of Hawach Sample Vial
What is the sample vial? Sample vials, also named as sampling bottles, purification bottles, aseptic bottles, clean bottles, filter bottles, etc., are essential for detecting pollution. According to International Standard, it is specially qualified for cleaning appliances so that the vial totally differs from other liquid samples. Categories of the sample vial According to the volume, the sample vial can be divided into 150ml and 250ml, which are respectively involves outer diameter 50mm * caliber 22mm * bottle height 130mm and outer diameter 70mm * caliber 30mm * bottle height 140mm. In addition, the sample vial specialized for particle counter notably has three main applications. The first is collecting liquid samples for particle contamination test, and the second is holding highly purified reagents with the last—filling granular standard materials and standard samples. Manufacturing Process Take the sample vial which is designed for particle counter for example. Its manufacturing requires technological process such as a high-precision ultrasonic cleaner, thousand-level clean air, stoving, sealing, etc.. It is also a container for testing particle counter of liquid contamination, suitable for sample collection, high cleanliness reagents, granular reference materials and samples for various liquid granularity tests.
about 2 days ago from web -
Guide To Select Flash Column
Flash column chromatography is an efficient way to separate complex mixtures of compounds in the lab. we use compressed air to push the solvent through the column when we are running flash columns. It can help provide better separation and cut down the running time as while. Flash column with high-quality must-have features of high flow rates for fast purification of target compounds, reliable, consistent performance from automated precision packing, and various of column sizes available for purifying milligrams to several grams. Tightly controlled water content, our flash column can fit standard Luer-Lock perfectly, connected with prepacked and empty column both for the choice of the full range of volume. We have the best silica gel columns with the design which avoids umber-some, expensive adapters, valves, and other accessories. Machine packed with ultra-pure sorbents, our flash columns are the best silica gel columns for flash purification of organic compounds with the highest resolution and duplicability for normal-phase separations in the lab.
about 2 days ago from web -
Filter Cartridges For Industrial Applications
Hawach filter cartridge is the purification equipment for purifying the original ecological resources and recycling the resources, which has the characteristics of low-pressure difference, strong pollution carrying capacity and long service life. Features of filter cartridges： 1. Excellent chemical compatibility, suitable for filtering strong acids, strong bases, and organic solvents; 2. Fold-type deep filtration with large membrane filtration area; 3. The low-pressure difference, strong pollution carrying capacity and long service life; 4. Wide filtering accuracy; 5. Clean air, noise reduction, and fuel saving. The application of filter cartridges: 1. Pharmaceutical industry: pre-filtration of various antibiotics and other pharmaceutical solutions; 2. Food and beverage industry: filtration of wine, mineral water, and drinking water; 3. Electronics industry: high purity water pre-filtration; 4. Chemical industry: filtration of various organic solvents, acids, and lye; 5. Metallurgical industry: filtration of various lubrication equipment and hydraulic system for rolling mill and continuous casting machine; 6. Textile industry: purification and uniform filtration for polyurethane melt in the process of wire-drawing, air compressor protection filtration, compressed gas oil, and water removal. Filter cartridges mainly include membrane pleated filter, microfiber pleated filter, big pleated filter, small pleated filter, metal filter cartridge, and other filter cartridges.
about 2 days ago from web -
Product Function Of c
In the application of membrane separation technology, the microporous membrane is the most widely used membrane variety. It is simple and fast to use and is widely used in many fields such as scientific research, food testing, chemical industry, nanotechnology, energy, and environmental protection. The PES microfiltration membrane filter has an asymmetric structure with a high flow rate, high throughput, high strength, and high-temperature resistance. It can effectively remove particulate matter and is suitable for use in medicine, wastewater treatment, and drinking water purification. Product Features High flow rate, high throughput; Inherent hydrophilicity; Not easy to protein binding, low membrane fouling; Good chemical compatibility; High mechanical strength; Clean environment production; The product undergoes a 100% integrity test before leaving the factory. Product supplicate in conventional filtration low protein adsorption filtration, ion chromatography solution filtration, rapid sterilization of tissue culture media, additives, buffers, and other aqueous solutions, pharmaceutical liquids, biological and serum in the pharmaceutical industry, terminal filtration of large infusion antibiotics, food industry beverage, wine and other terminal filtration, etc.
about 2 days ago from web -
Reasons For HPLC Column Peak Fork And No Indication
1.HPLC column no indication (1) The pump seal gasket is worn; (2) A large number of air bubbles enter the pump body. Treatment For this case, replace the gasket; for the second case, use a 50 ml glass syringe to help extract air at the pump outlet while the pump is acting. 2. HPLC column peak fork (1) The HPLC column is contaminated; (2) The stigma packing collapses. Treatment For this case, first flush the column with pure water, then replace it with methanol, then rinse the column with methanol + isopropanol (4+6) (the length of the rinse time is determined by the contamination of the sample), and then Rinse with methanol, rinse with pure water, and finally rinse with methanol for more than 30 minutes. If the peak is still poor after rinsing, consider the second case. For the second case, unscrew the column head and check that the HPLC column packing is indented or collapsed. Remove the indurated part (contaminated packing), fill in the new packing, drop a drop of methanol, fill the packing, refill, press with a smooth stainless steel rod with the same inner diameter of the column, fill it again, drop the methanol, and then press it again. Once, until it is filled and filled. Rinse the HPLC column head with methanol, wipe the packing on the outer wall of the column, tighten the column head, and rinse with pure methanol for more than 30 minutes.
about 2 days ago from web -
Model Of Solid Phase Extraction
Solid phase extraction (SPE), developed in the 1970s, can replace the traditional liquid-liquid extraction in many fields and has been applied more and more widely in the laboratory. The common solvent of SPE Hexane, isooctane, tetrahalide carbon, trihalomethane, dihalomethane, tetrahydrofuran, ether, ethyl ester, acetone, cyanogen, isopropanol, methanol, water, acetic acid. Model of SPE 1. Positive phase: polarity of adsorbent is greater than that of eluent; polar compounds can be adsorbed from nonpolar solvent samples. Reverse phase: polarity of adsorbent is less than that of eluent; the interaction between the target compound and the adsorbent is hydrophobic. 2. Ion exchange: the target compounds extracted are those with an electric charge. 3. The adsorption. The more similar the polarity between the target compound and the adsorbent, the better the retention. The adsorbent used in SPE is the same as the fixed phase commonly used in liquid chromatography, but the particle sizes are the difference. When selecting separation modes and adsorbents for SPE, should be considered: 1. The solubility of polar or non-polar solvents; 2. Possibility of ionization; 3. Whether it is possible to form a covalent bond with the adsorbent.
about 2 days ago from web -
The Basic Knowledge About Vacuum Filtration
The principle of vacuum filtration is forming the negative pressure to drive the filtration at the outlet of the filtrate. This kind of filtration according to the forms of operation is divided into two types: batch operation and continuous operation. The vacuum filtration with batch operation can filter suspensions of various concentration. And the one with continuous operation always uses to filter the thick suspensions with many solid particles. A simple filtration is a container that is separated into the upper chamber and the lower chamber by filter media. People put the suspension into the upper chamber. The suspension pass through the medium from the upper to the lower. And the solution in the lower chamber is filtrate. The solid particles remained on the surface of the filter medium is filtration residue. The filtration residue becomes more and more when the vacuum filtration is working. This situation causes the larger resistance. People should stop the filtration work when there is filled with the filtration residue or the speed of filtration is slow and clean up the residue. What people do is to make the filter medium rework or regenerate so as to complete a filtering cycle.
about 2 days ago from web -
Advantages And Application Prospects Of QuEChERS
QuEChERS method has unique advantages in pesticide residue analysis. Due to the irrational use of pesticides and inadequate supervision of pesticide use, people may suffer from acute or chronic pesticide poisoning after eating pesticide-contaminated food, and even threaten human health or life safety. Since the advent of the QuEChERS method, many laboratories such as the US FDA have conducted effective evaluation and verification of the method, and some laboratories have applied the method to routine pesticide testing. The advantage of QuEChERS 1. Improve the working efficiency of the laboratory; 2. Reduce possible instrument maintenance time; 3. Improved analysis efficiency; 4. Reduce the number of potential distractors. The application prospect of QuEChERS In China, this method is not only suitable for sample pretreatment of multi-residue detection of agricultural products but also widely used in environmental pesticide residue detection, agricultural veterinary drug detection, biological sample drug detection, and other fields. With the progress of science and technology and the continuous development of modern detection methods, QuEChERS method is bound to be more mature and will gradually be used in daily pesticide residue monitoring.
about 2 days ago from web -
Main Points Of Maintenance Of Hawach Glass fiber Extraction Thimble
Hawach glass fiber extraction thimble is made of 100% pure super-fine glass micro-fiber without any binding elements. It is mostly used to monitor stationary pollution sources. It has low background response, high collection efficiency and small differences among different batches even can be used in the flue of 600℃. The maintenance of this production is particularly important to the users. Proper using and maintenance can markedly prolong its service life and improve work efficiency. Here the author proposes four main points of maintenance of glass fiber extraction thimble as follows: 1. Before to use, introduce bactericides into the raw water to kill germs and micro-organisms and keep a suitable concentration of the nitrogen in it carefully. These measures are helpful to inhibit the growth of bacteria on the surface of our product. 2. In use, the glass fiber extraction thimble should be cleaned regularly. Rinse it with clean water, the special chemical cleaning agent is necessary to join in sometimes. 3. In use, the dramatic changes of pressure should be avoided to the retard the product material aging. The sudden impact can do great damage to the product. 4. when the solution has a high colloid content, it should be treated by sedimentation prior to the using. when the compounds are recovered after filtering, reference should also be made to the properties of raw water. In a word, there are many effective measures for the maintenance of glass fiber extraction thimble, we should strengthen the learning of professional methods. Even if the product is newly bought, maintenance work is always very important.
about 2 days ago from web
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