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Composition analysis of scale inhibitors

Dispersing agent is the surface active agent can be dispersed particles by liquid phase fully wettability and uniformly dispersed solids in suspension, and the system of separation, aggregation and solid particle settling velocity is reduced to the minimum, in order to maintain the suspension of the maximum dynamic stability.Due to the molecular chain of polyacrylamide containing carboxyl, with lower surface tension, helps the water of solid wetting, which for fiber and filler in water dispersion is particularly advantageous, when PAM slurry can enable fiber, filler surface formed double structures outer dispersion agent and extreme water has strong affinity, increase the fiber and filler of solid particles is wetted by water. The fiber, filler and other solid particles are far away from the electrostatic repulsion, to achieve good dispersion effect. To travel and improvement of solid or liquid materials with functional additives, and surfactants. In the solid state dye grinding in netting agents are helpful for particle crushing and stop has crushed particle coagulation in order to maintain the netting body firmly; insoluble in water oily liquid at high shear shear stirring can win over a very small liquid beads, stop stirring, interfacial tension soon delamination, and participate in the win over agent after stirring can resolute emulsion formation. Defoaming agent in this a series of personality, the United States is the most developed a new scale win agent. This win agent is the Sheung Shui and wastewater treatment trick most coagulant.Alum is a mixture of aluminum sulfate and potassium sulfate or ammonium sulfate, commonly used in drinking water pollution, but in industrial water and wastewater treatment application is not much. At the same time, due to the application of dispersant double and multilayer filter, on coagulation call drop. China's production of polyaluminium chloride does not mature, in the main lobby of aluminum ash for a period of time. At present, the price of the aluminum chloride has gradually increased with the increase of the cost of aluminum. In the first few years, the waste water treatment or aluminum sulfate. At present, the global aluminum sulfate production of about 400-500 million tons, which has a disproportionate for all water supply and wastewater treatment. According to statistics, our country if the 50% aluminum sulfate solid products instead of liquid scale win agent, can not need concentration, defoaming agent crystallization processes including, substantial use of waste each year.

18
2015-07

Current position: information on the home page of the information, the principle, application and notice (text) of the solid phase extraction

Solid phase extraction is a physical extraction process including liquid and solid phases. In solid phase extraction, the adsorption capacity of the solid relative separation is greater than that of the solvent. When the sample solution through the adsorbent bed separation concentrate on its surface, the other sample constituents through the adsorbent bed; only through adsorption isolates without adsorbing other sample constituents of adsorption agent, isolates of high purity and concentration can be obtained. Retention and elution in solid phase extraction method is the most common is the solid sorbent loaded in a needle shaped column. The sample solution by adsorption agent bed, in a sample of compounds or by adsorbent or retained in the adsorbent (depending on the adsorbent of solvent on the relative adsorption). "Retention" is a phenomenon that exists in the molecular attraction between the adsorbent and the separation. It is caused when the sample solution is passed through the adsorbent bed. Retention is the function of three factors: separation, solvent and adsorbent. Therefore, the retention behavior of a given separation is changed in the presence of different solvents and adsorbents. "Elution" is a process that retains the separation of the adsorbent on the adsorbent, which is accomplished by the addition of a solvent that is more attractive to the separation. Capacity and selectivity of the adsorbent capacity is in the optimal conditions, the amount of unit adsorbent can retain a strong retention of the total separation of the total. The capacity of different bonding silica gel adsorbent was varied. Selectivity is the ability to distinguish between the adsorbent and the other sample matrix compounds, that is, the retention of the separation of the samples to remove other compounds. A highly selective adsorbent is a adsorbent for the separation of the separation of the sample matrix. Adsorbent selectivity is a function of three parameters: the chemical structure of the separation, the nature of the adsorbent and the composition of the sample matrix. Solid phase extraction of brief process 1. A sample including isolates and disruptors through adsorbent; 2 adsorbent for selective retention of isolates and some interferents and other substances through the adsorbent; 3. With the appropriate solvent elution adsorbent, the previously reserved interferents choose shower wash, isolates were retained in the adsorbent bed. Purification, concentrated isolates from the adsorbent leaching down. Solid phase extraction (principle of solid phase extraction (use pump numerical control technology, each column joints can provide independent relatively constant negative pressure, make all kinds of solution according to the standard analysis of procedural requirements flow through the column, and ensure efficient extraction of the analysis of target substance. The columella conversion to elution rack, positive pressure uniform elution, to avoid cross contamination. Application of solid phase extraction instrument of solid-phase extraction apparatus can be applied in all kinds of food safety detection, agricultural residue monitoring, medical and health, environmental protection, commodity inspection, tap water and chemical laboratory for the production of. In sample processing, CNC precise control of solution a column flow rate, also has the positive pressure elution and large volume continuous injection and timing functions, to ensure the recovery rate and purity of target analysis of material, reduce the relative deviation, to avoid cross contamination between samples, may simultaneously carry on the processing of multiple samples, to further improve the work efficiency, operation, maintenance is very simple. The safety of the solid phase extraction apparatus is not correct in use will lead to electric shock or fire accident. In order to prevent the occurrence of dangerous situations, please follow the following guidelines in the installation, maintenance and cleaning of the machine. In order to ensure your safety and extend the service life of the machine, maintain the quality of the use of the machine, please read the following safety precautions. 1. Before using the machine, you must read and understand all of the guidelines. 2, must be properly preserved for future use, possible period of want or need. 3, must strictly comply with the machine and its instructions on the use of a warning. 4, the operation must comply with all instructions. 5, do not control the company did not recommend the pump and accessory device use. Inappropriate use of attached device may happen. 6, power line should be properly set to avoid being trampled and object extrusion. 7, AC power outlet and the extension of the wire can not be too, the load will lead to fire or electric shock accident. 8, do not place any foreign body through the ventilation holes or openings stuffing machine, do not water or other liquid is spilled into the chassis control panel on. 9, in any of the following situations, please immediately from the AC power supply socket and pull the power plug: 1) switch, a power cord or plug is damaged; 2) open the chassis backplane for inspection, maintenance or replacement of the pump CNC; 3) pump CNC rupture, liquid is shed from the enclosure; 4) the machine being rain or damage; 5) if you have to use the instructions, but the machine is still not working properly; 6) the machine falling off or damaged; 7) the machine appear abnormal. 10, before cleaning the machine, please unplug the power plug from the AC power outlet. Please use a slightly damp cloth to clean the machine. Do not use liquid cleaner or spray cleaner when cleaning. The machine can be used to prolong the service life of the clean, cool and dry environment. Please put the machine is positioned in the level of experimental bench or in the fume hood used, do not let the machine close to the heat source, do not let objects cover is the ventilation holes of the panel and the soleplate. All electrical interfaces are required to plug in a power down case. The failure of the solid phase extraction apparatus and the removal of the phenomenon of the project to open the power switch LED is not on the 220V

18
2015-07

Comparative analysis of gas chromatography and liquid chromatography

First, the separation principle1 gas: gas chromatography is a physical separation method. Using the measured material components in a slight difference in the different distribution coefficients of the two phases, when the relative motion of the two phase, these substances in two phases are repeated allocation, make originally only minor differences in the nature of the produced great effect, and the different components are separated.2. Liquid phase high performance liquid chromatography (HPLC) method is on the basis of classical chromatography, quoting the theory of gas chromatography (GC), in mobile phase change for conveying high pressure; at the same time column is connected with a high sensitivity of the detector, continuous monitoring of effluents.Two, application scope1. The gas phase: gas chromatography method has good separation ability, high sensitivity, analysis speed, easy to operate, and other advantages, but by the technical conditions of the restrictions, substances with high boiling point substance or thermal stability is poor are difficult to use gas chromatography were analyzed. In general, the material part which is not easy to be decomposed or heated to be decomposed under 500 is used to derive the derivative method or the cracking method.2 liquid phase: high performance liquid chromatography method, only the sample can be made into solution, and do not need to gasification, therefore not subject to the sample volatile. High boiling point, thermal stability and relative molecular weight can be applied to the separation and analysis of high boiling point.Three, their respective advantagesGas chromatography is not suitable for non - volatile matter and the heat labile substance, while the liquid chromatography is not limited by the volatility and thermal stability of the sample. Some samples can not be passed through the column, and the heat of the material is not stable. This allows the use of gas chromatography to be limited by the scope of use. According to statistics, the organic matter which can be analyzed by gas chromatography is only 15% to 20% of all organic matter. On the other hand, liquid chromatography is not limited by the sample's volatility and thermal stability. Therefore, liquid chromatography is suitable for the separation of biological and pharmaceutical related macromolecular and ionic compounds, unstable natural products, a wide variety of other polymers and unstable compounds.For very hard to separate the sample, using liquid chromatography is often easier than using gas chromatography to complete separation, the main reasons for the following three aspects:In liquid chromatography, the separation process is also affected by the flow phase, which provides additional factors for the control and improvement of the separation. Gas phase chromatography carrier gas generally do not affect the distribution, that is to say, in liquid chromatography, the interactions of the two phase and sample molecules selectively.There are many kinds of columns packed with special efficiency in liquid chromatography, which makes the choice of the stationary phase is greater, which increases the possibility of separation.Liquid chromatography is used to separate the temperature and the interaction between molecules is more effective at low temperature, so the temperature can be decreased by increasing the separation efficiency of gas chromatography. Compared with gas chromatography, liquid chromatography is easy to recover the sample, and it is quantitative, and the sample can be separated easily. Therefore, in many cases, liquid chromatography is not only an analytical method, but also as a means of separation, which can be used to purify and prepare a single substance with moderate purity. In gas chromatography, the samples can be recovered, but they are not convenient, and the quantitative difference is not very convenient. Liquid chromatography has been widely used in many fields due to its advantages, which are not available.

18
2015-07