The application of solid phase extraction technology is becoming more and more extensive. The following three aspects summarize the application of solid phase extraction technology in water analysis.
(1) Pretreatment of pesticide residues in water
For the determination of pesticide residues in water, non-polar adsorbents such as C18 and C8 are generally used, and methanol is usually used as the eluent. Due to the strict requirements for pesticide residue limits in water bodies, the mass concentration of pesticide residues in natural water bodies is also usually very low. Without reliable separation and enrichment methods, it is difficult to detect, using the solid phase extraction device of Shanghai Guige Industrial Co., Ltd. Make extraction, enrichment and purification in one step. Pre-concentrate a large volume of sample through a solid phase extraction column, elute with a small volume of eluent, and then concentrate to a fixed volume for detection, which greatly reduces the detection limit of the detection method.
(2) Pretreatment of organic matter in water
We know that organic matter can remain relatively stable in environments such as ponds and reservoirs, but once it enters the sampling bottle, it will change quickly, so organic matter analysis requires immediate analysis.
Because the solid phase extraction equipment is simple, small in size and easy to carry, it can do sampling and pre-processing. The sampler brought back to the laboratory the solid phase extraction column, not the water sample. This will ensure that the water sample data we process is accurate.
In the monitoring of urban water supply and water quality, five kinds of trichlorfon, dichlorvos, dimethoate, methyl parathion, parathion, and parathion were measured in the determination of organophosphorus pesticide indicators. Solid phase extraction of Tianjin Hengao Technology Development Co., Ltd. The device is used for measurement, that is, a solid phase extraction column is used to adsorb trace organic phosphorus pesticides in water, eluted with a mixture of methanol and acetone, concentrated, and then measured by flame photometric detector (FPD) gas chromatography.
(3) Pretreatment of phenolic compounds in water
In the monitoring of urban water supply quality, in the determination of indicators of phenolic compounds, a total of 5 compounds of 4-nitrophenol, 3-methylphenol, 2.4-dichlorophenol, 2.4.6-trichlorophenol and pentachlorophenol were measured It can be measured by the solid phase extraction device of Shanghai Guige Industrial Co., Ltd. The solid phase extraction column is used as the enrichment column to enrich the phenolic compounds in the water. After elution with tetrahydrofuran, concentration and constant volume, C18 or C8 Chromatographic column, using A: methanol acetic acid solution, B: acetic acid solution as the eluent for gradient elution, using a programmable ultraviolet detector or array diode detector for measurement.
For water supply companies and water quality monitoring organizations, cost-effective domestic SPE devices can save time and costs. Industry experts, enterprises, and water quality monitoring organizations are welcome to pay attention to our products. We look forward to the comprehensive improvement of drinking water quality!
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