AI Article Synopsis
- This study introduces a capillary electrophoresis method for simultaneously detecting nitrate and nitrite in gunshot residue using an acidic run buffer at pH 3.5.
- By reversing the electroosmotic flow, the method achieves fast analysis with well-defined ion peaks appearing in under 4 minutes.
- Ultrasound mixing proved effective for sample extraction, and the method was validated using real gunshot residue samples with improved detection limits of 6.7 μM for nitrate and 4.3 μM for nitrite.
Article Abstract
Simultaneous determination of nitrate and nitrite in gunshot residue has been conducted by capillary electrophoresis using an acidic run buffer (pH 3.5). In previously developed capillary electrophoretic methods, alkaline pH separation buffers were used where nitrite and nitrate possess similar electrophoretic mobility. In this study, the electroosmotic flow has been reversed by using low pH running buffer without any additives. As a result of reversing the electroosmotic flow, very fast analysis has been actualized, well-defined and separated ion peaks emerge in less than 4 min. Besides, the limit of detection was improved by employing large volume sample stacking. Limit of detection values were 6.7 and 4.3 μM for nitrate and nitrite, respectively. In traditional procedure, mechanical agitation is employed for extraction, while in this work the extraction efficiency of ultrasound mixing for 30 min was found sufficient. The proposed method was successfully applied to authentic gunshot residue samples.
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| http://dx.doi.org/10.1111/1556-4029.13275 | DOI Listing |
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