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WhatsApp: +86 18203695377WEBAdd about 1 to 2 percent of your sample, mix and grind to a fine powder. For very hard samples, add the sample first, grind, add KBr and then grind again. The sample must be very finely ground as in the Nujol mulling technique to reduce stering losses and absorption band distortions. Take two stainless steel disks out of the desicor.
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WhatsApp: +86 18203695377WEBThe faults described below are for pure KBr or other halide salts which do not contaminate the sample. When the sample powder is added to the halide salt for pellet making, the clarity of the disc will depend to a large extent on the quantity and type of sample. Usually to 2% weight to weight of sample to KBr is perfectly adequate.
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WhatsApp: +86 18203695377WEBFor solids, the sample can be pressed into a KBr pellet, sandwiched between KBr salt plates, or mixed with a mineral oil to create a mull. For liquids, the sample can be injected into a liquid cell, sandwiched between KBr salt plates, or applied to an IR transparent card. For gases, the sample can be introduced into a gas cell. Figure 2.
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WhatsApp: +86 18203695377WEBIt can be seen that the peak shape deteriorates as the injection volume increases. Effect of Elution Strength of Sample Solvent on TPNcaption. Comparison of Peak Shape Between Injection Volume. describes an image of the analytes and the sample solvents moving through the column. Sample solvent can be considered as part of the ...
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