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Laboratory Water Purification Systems

laboratory water purification systems used in laboratory

1. What are laboratory water purification systems?
    1.1 Working principle of laboratory water purification systems
    1.2 Application of laboratory water purification systems
    1.3 Feature of laboratory water purification systems
2. Difference between laboratory water purification systems and home water purifiers
    2.1 Laboratory water purifier
3. Things to note when choosing laboratory water purification systems
    3.1 Water purification lab
4. How to buy laboratory water purification systems?

What are laboratory water purification systems?

Laboratory water purification systems are a kind of pure water machine with stable performance, which are used in a large number of industries such as medicine, electronics, chemical industry, glass, ferry coating, boiler, laboratory, etc. Small deionized water equipment can be used to make high-purity water directly from the tap water, and the operation cycle is long, without frequent maintenance and replacement of various spare parts, and extremely quiet operation. Some enterprises do not use much water, our factory specifically for these customers customized a series of small deionized water equipment, and the water output is small. The equipment can meet the requirements of laboratory water, small measurement cleaning water, and water quality can be based on the requirements of the equipment process configuration.

Working principle of laboratory water purification systems

Laboratory water purification systems work on the principle that when all the exchangeable ions on the resin have been exchanged during the resin exchange process, the resin no longer has the effect of exchanging ions in the water, a phenomenon we call "failure". After the resin regeneration, the ratio of the working exchange capacity and the total working exchange capacity of the resin is called the resin regeneration degree.

Laboratory water purification systems operate with regenerant, regeneration concentration, flow rate, temperature, process operation, backwash conditions, and suction bed resin regeneration. Laboratories usually determine the regeneration of the exchange bed based on the resin regeneration degree.

Application of laboratory water purification systems

The lab water purification system is suitable for the production of semiconductors, integrated circuit chips and packaging, liquid crystal displays, high-precision circuit boards, optoelectronic devices, various electronic devices, and other electronic industry ultra-pure water systems. The water quality can reach up to 18.3 megohms, which meets the requirements of ultra-pure water quality required for the production of the electronics industry.

a. Pure water manufacturing for the electronics industry such as monocrystalline silicon, semiconductors, integrated circuit blocks, IC chip packaging, picture tubes, glass cases, liquid crystal displays, printed circuit boards, optics, optoelectronics, thermal power plants, metallurgy, chemical industry, light industry, automobile manufacturing, pharmaceuticals, medical and health care manufacturing industries.

b. Pharmaceutical industry such as large infusion, pharmaceutical preparation, test analysis, hemodialysis, pharmaceutical, preparation process water manufacturing.

c. Coating industry such as electroplating, battery production, electrophoretic paint production line; automobile, electrical appliances, building materials products surface cleaning, painting; glass, plastic surface coating, etc.

d. Chemical industry water manufacturing such as chemical pharmaceuticals, textile printing, and dyeing, fine chemicals, cosmetics, ink cartridges, daily chemical products, etc.

e. Experimental ultrapure water such as production laboratories, chemical laboratories, physics laboratories, pilot plants, hospital biochemical rooms, etc. in factories, universities, and companies.

Feature of laboratory water purification systems

a. Space-saving dock-type water tank with smooth interior and configuration of composite ventilation filter can ensure that the water has the most ideal purity.

b. UV completely in the circulation line ensures minimal microbial contamination.

c. EDI (option-r) purification technology is optional.

d. Height adjustable faucet can meet the needs of wall or countertop installation completely in the cycle to ensure the water quality at the point of discharge.

Difference between laboratory water purification systems and home water purifiers

Laboratory water purifier

The water purifier is divided into two categories, one is the laboratory water purifier, which can meet the laboratory requirements for pure water quality. One is the living drinking type of water purifier, also called home water purifier, home water purifier.

The purification system of a lab water purifier mainly includes three parts: a pretreatment unit, RO reverse osmosis unit, and a post-purification unit. Its working principle is: the tap water through the role of precision filters and activated carbon cartridge to remove large particles in the water and adsorption of odors in the water, the water through the pretreatment unit to remove most of the impurities in the water, and then the use of reverse osmosis unit to purify the water desalination process, the pure water after the purification unit to obtain high-quality pure water. To avoid secondary pollution caused by the contact between the pure water and air, the pure water will flow directly into the water storage tank.

The function of the household water purifier is to filter the floating matter in the water, heavy metals, bacteria, viruses, etc. are removed, it has a higher filtration technology, generally, five levels of filtration, * level for the filter element also known as PP cotton, the second level of granular activated carbon, the third level of precision compressed activated carbon, the fourth level of reverse osmosis membrane or ultra-filtration membrane, the fifth level of post-activated carbon. The water purifier is not only applicable to areas with more serious tap water pollution, but also can filter the residual chlorine in conventional tap water while improving the taste of water.

The main difference between laboratory water purification systems and home water purifiers lies in the filtration process. Laboratory water purifiers in the pretreatment stage in addition to removing coarse particles impurities, sludge, colloids, suspended substances, etc. also removed calcium, magnesium, potassium and other minerals beneficial to the human body, long-term consumption of pure water will cause a lack of trace elements in the body, and even the body's internal environment, including pH, will have an impact on the body will lead to a reduction in immune function, which is not conducive to health.

Things to note when choosing laboratory water purification systems


Water purification lab

In the laboratory, we do experiments every day, and there is no reagent that we come into contact with more than water. Water is usually used throughout our experiments. Perhaps it is because of the prevalence and availability of water that we often overlook the impact it has on experimental results. Proper selection of water purification instruments can help researchers avoid many unnecessary troubles.

Before selecting a suitable lab water purification system, we should first understand what kind of water we need for our experiments. Different international organizations such as ASTM, CLSI, ISO, etc. set different water quality standards, so it is difficult to classify the grade of laboratory water. Generally speaking, laboratories use the following grading method.
ApplicationPure water levelRelevant parameters
a. High-Performance Liquid Chromatography (HPLC)
b. Gas Chromatography (GC)
c. Atomic Absorption (AA)
d. Inductively Coupled Plasma Spectroscopy (ICP)
e. Inductively coupled plasma mass spectrometry (ICP-MS)
f. Molecular biology experiments and cell culture, etc.
Class I waterResistivity (MΩ.cm): >18.0

TOC content(ppb): <10


Particles (units/ml): <1

Silicide (ppb): <10

Bacteria (clu/ml): <1

pH: NA
a. Preparation of common reagent solutions
b. Preparation of buffers
Class II waterResistivity (MΩ.cm): >1.0

TOC content(ppb): <50

Thermogenic(Eu/ml): <0.25

Particles (units/ml): NA

Silicide (ppb): <100

Bacteria (clu/ml): <100

pH: NA
a. Glassware rinsing
b. Water for water bath
Class III waterResistivity (MΩ.cm): >0.05

TOC content(ppb): <200

Thermogenic (Eu/ml): NA

Particles (units/ml): NA

Silicide (ppb): <1000

Bacteria (clu/ml): <1000

pH: 5.0-7.5
Different levels of water quality are selected according to the application of the experiment, and the laboratory water purifier is selected to meet the application requirements for different water requirements. In general, laboratories need to consider the following factors when selecting laboratory water purification systems.

A. Water quality monitoring instruments

A high-quality lab water purifier must include real-time online ion level monitoring (resistivity detector) and continuous online organic contamination monitoring (TOC detector). Conventional water purifiers only have resistivity detectors, which reflect the purity of water by monitoring the movement of ions in the liquid solution between the anion and cation electrodes. The measurement results are related to ion concentration, charge number, and ion mobility, which is a good parameter to indicate the purity of water. The theoretical resistivity of ultrapure water at 25°C is 18.2 MΩ.cm.

However, only the resistivity reading of 18.2 MΩ.cm (25 ℃) as a measure of ultrapure water is not enough, because many organic molecules do not exist in ionic form, so it will not affect the determination of resistivity, resulting in a good resistivity reading when the water may still be contaminated with organic matter. Similarly, the value of TOC detected can only indicate the amount of organic matter in the water and does not indicate the concentration of anions and cations in the water. So, the two must be combined and a water purifier with both a resistivity detector and a TOC detector must be selected to ensure higher-quality ultrapure water.

B. Microbial contamination

Microbial contamination is one of the most commonly overlooked problems. Once microbial contamination occurs, it will quickly spread throughout the pure water system and gradually form a bacterial film that is difficult to remove. They constantly release organic matter and ions into the water, and the use of such water can lead to ghost peaks when performing ion chromatography and high-performance liquid phase analysis.

Microorganisms are particulate matter that can cause an increase in column back pressure during liquid chromatography analysis and can damage ICP sprayers when doing ICP-MS detection experiments. Microorganisms also release certain amounts of macromolecules such as enzymes (nucleases, alkaline phosphatases, etc.) and endotoxins. The presence of nucleases is very detrimental to molecular biology experiments concerning DNA and RNA, and alkaline nucleases released by microorganisms can also cause false positive results in enzyme immunoassays. Endotoxins can activate cells to produce signaling substances and inhibit enzyme activity.

To prevent microbial contamination, we should choose a tank with no dead volume, recirculation lines, sterile overflow ports, air filters, and UV sterilization (e.g. Millipore's Tank), which can inhibit the growth and proliferation of microorganisms in the system to the greatest extent possible.

C. Easy to use

Ultrapure water must be taken immediately, this is because the highly purified water has a higher affinity for chemicals, compared with ordinary water is more likely to absorb chemicals from storage containers (such as vessels, and test tubes) and chemical vapors, general laboratory use of polyethylene glass bottles and wash bottles, etc. will also release organic and inorganic substances into the ultrapure water so that ultrapure water is contaminated. So, if the experiment needs to use ultrapure water, then it is best to choose an ultrapure water dispenser with remote water extraction and multiple water extraction port functions.

D. Easy maintenance

The ion exchange resin-activated carbon and ultrafiltration membrane used in the water purifier have a certain service life. Many people think that ion exchange resins can be constantly regenerated and recycled, but they are not. Expired or regenerated resins can release high concentrations of contaminants into the water, and the reuse of regenerated resins can also lead to the breakage of resin particles, releasing particles and organic matter into the water and accelerating the growth of microorganisms. Therefore, regular replacement of consumables is an important thing that must be put into practice. So the instrument itself comes with an early warning function that is very important, it can be in the consumables depletion, water quality completely bad before, to remind you ready to replace the consumables. In addition, we should try to choose a water purifier that can easily and conveniently replace the consumables of the instrument, even if the engineer can not come to the house in time, we will not be worried about poor water quality and delay our experimental process.

How to buy laboratory water purification systems?

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