The solid-phase extraction (SPE) technique is a widely used sample preparation method in analytical chemistry. It typically involves three main steps: first, gathering relevant information about the sample and target compounds; second, developing a preliminary SPE method based on that information; and third, optimizing the parameters of the method to achieve the best results.
The AutoSPE control software is designed with user-friendliness in mind, offering a graphical interface that supports Chinese operation. From system setup to method creation, the software takes into account the needs of users at every stage. Its built-in SPE protocols include common procedures such as activation, loading, washing, drying, elution, and liquid handling, making it easier for users to create and refine their methods.
Common issues encountered during solid-phase extraction include flow rate problems, recovery rate issues, and contamination concerns.
First, the flow rate significantly affects the efficiency of the extraction process, especially during sample loading and elution. A stable flow rate is crucial, as too fast a rate can reduce the recovery of target compounds, particularly when using ion exchange mechanisms. On the other hand, a slow flow rate may increase analysis time and lower overall efficiency. To address this, the AutoSPE system uses six high-precision ceramic metering pumps and positive pressure loading, ensuring accurate and consistent flow rates according to the specified sample volume, which improves the accuracy and reproducibility of the results.
Second, poor recovery rates are often due to improper method setup or incorrect flow rate control. When results are not satisfactory, it's important to systematically troubleshoot and adjust the method. Controlling the flow rate is one of the most critical factors in achieving reliable outcomes.
Third, column contamination can be a challenge, especially when dealing with high concentrations of target compounds or sensitive detection methods. While reputable manufacturers usually maintain contaminant levels within parts per billion (ppb), some impurities might still interfere with the detection of the target compound. In such cases, pre-cleaning the column can help improve the quality of the results.
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