The authors describe a method for amperometric determination of chloramine-T that is based on the indirect detection of chloramine-T by detecting p -quinone imine ( p -QI) that is generated by oxidation of p -aminophenylboronic acid by chloramine-T. p -QI can be detected with excellent selectivity and at low potential by using a glassy carbon electrode. Hence, the method displays attractive features such as high sensitivity, wide detection range and excellent selectivity. The electrode has two linear responses in the 50 nM to 100 μM concentration range and a 6 nM detection limit. Compared to other electrochemical methods, this assay has a detection limit that is better by three orders of magnitude. The relative standard deviation is 3.4% for the determination of 10 μM of the medical chloramine-T sample, and the recovery of a samples containing chloramine-T at a level of 10 μM is 115%.
Highly sensitive electrochemical detection of chloramine-T is achieved based on the reaction of chloramine-T with p -aminophenylboronic acid with a detection limit of 6 nM.
Vortex-assisted liquid–liquid microextraction is reported for the preconcentration of chloramine-T before determination by high-performance liquid chromatography with a diode array detector. Magnetite nanoparticles were used to remove hydrophobic additives in cosmetics by physical adsorption. The method used sonication for 30 min at 45°C in 40% hydrochloric acid to convert the analyte to p-toluenesulfonamide. 1-Hexanol was the extraction solvent with vortex mixing. The extraction conditions were optimized to provide a linear dynamic range from 0.5 to 500.0µg/mL. The recovery of chloramine-T was from 90.8 to 100.9% with a relative standard deviation from 3.7 to 6.5%. The limit of detection was 8.2 mg/kg and the enrichment factor (EF) was 100. Good repeatability, quantitative recovery, and a high EF demonstrated the suitability of the procedure for the determination of chloramine-T in cosmetics.
To improve the performance of lime mortar, ancient craftsmen often added various additives to mortars, including inorganic and organic materials. The analysis of mortar additives plays an important role in the conservation and restoration of historical buildings. However, it is quite difficult to accurately identify the species of additives. This paper proposed a series of semi-quantitative analytical procedures to identify the organic additives in ancient lime mortars. By using reagents such as phenolphthalein, periodic acid, acetylacetone, anthrone, bicinchoninic acid (BCA), iodine-potassium iodide, chloramine T, etc., organic additives such as triglyceride, soluble sugar, starch, and protein (including blood, gelatine, and other unknown proteins) remaining in ancient lime mortar were accurately detected, respectively. The linear relationship of the standard curve was significant, and the detection limits for the target additives were below 7 µg/mL. The process is easy to operate within 6 h, and it is suitable for rapid in-situ testing.
危险品化学品经营许可证（带存储）