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  2. Sample preparation - Wikipedia

    en.wikipedia.org/wiki/Sample_preparation

    In analytical chemistry, sample preparation (working-up) refers to the ways in which a sample is treated prior to its analyses. Preparation is a very important step in most analytical techniques, because the techniques are often not responsive to the analyte in its in-situ form, or the results are distorted by interfering species .

  3. Sample preparation in mass spectrometry - Wikipedia

    en.wikipedia.org/wiki/Sample_preparation_in_mass...

    Sample preparation for mass spectrometry is used for the optimization of a sample for analysis in a mass spectrometer (MS). Each ionization method has certain factors that must be considered for that method to be successful, such as volume, concentration , sample phase, and composition of the analyte solution.

  4. Sub-sampling (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Sub-sampling_(chemistry)

    A riffle box is a box containing a number (between 3 and 12) of "chutes" - slotted paths through which particles of the sample may slide. The sample is dropped into the top, and the box produces two equally divided subsamples. Riffle boxes are commonly used in mining to reduce the size of crushed rock samples prior to assaying.

  5. Solid-phase microextraction - Wikipedia

    en.wikipedia.org/wiki/Solid-phase_microextraction

    Solid-phase microextraction sampling. Solid phase microextraction, or SPME, is a solid phase extraction sampling technique that involves the use of a fiber coated with an extracting phase, that can be a liquid or a solid (), [1] which extracts different kinds of analytes (including both volatile and non-volatile) from different kinds of media, that can be in liquid or gas phase. [2]

  6. Solid-phase extraction - Wikipedia

    en.wikipedia.org/wiki/Solid-phase_extraction

    SPE is in fact a method of chromatography, in the sense of having a mobile phase, carrying mixtures through a stationary phase, packed inside a column.The chromatographic process is harnessed to create a solid-liquid extractive technique—allowing separation of a mixture of components by taking advantage of large differences between the solid and liquid phase K eq, or equilibrium constant ...

  7. Bioanalysis - Wikipedia

    en.wikipedia.org/wiki/Bioanalysis

    The bioanalyst deals with complex biological samples containing the analyte alongside a diverse range of chemicals that can have an adverse impact on the accurate and precise quantification of the analyte. As such, a wide range of techniques are applied to extract the analyte from its matrix. These include: Protein precipitation

  8. Focused ion beam - Wikipedia

    en.wikipedia.org/wiki/Focused_ion_beam

    The main advantages of this method include a significant reduction of sample preparation time (quick welding and cutting of nanowire at low beam current), and minimization of stress-induced bending, Pt contamination, and ion beam damage. [14] This technique is particularly suitable for in situ electron microscopy sample preparation.

  9. Desorption atmospheric pressure photoionization - Wikipedia

    en.wikipedia.org/wiki/Desorption_atmospheric...

    Figure B is a transmission DAPPI technique. The UV Lamp (not seen in figure) is in the same place in both techniques. The UV Lamp is located above the surface space. Considered the normal or conventional geometry of DAPPI, this mode is ideal for solid samples that do not need any former preparation. [22] The microchip is parallel to the MS ...