Southern Federal University, Department of Chemistry, Zorge St., 7, 344090, Rostov-on-Don, Russia; Rostov State Medical University of the Ministry of Healthcare of Russian Federation, Pharmaceutical Faculty, Nakhichevansky Lane, 29, 344022, Rostov-on-Don, Russia.
Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 1/3, 119991, Moscow, Russia.
Talanta. 2020 Nov 1;219:121254. doi: 10.1016/j.talanta.2020.121254. Epub 2020 Jun 15.
An improved step-by-step colorimetric method for determination of halides has been developed. The method is based on successive selective oxidation of iodide, bromide and chloride into corresponding free halogens, their extraction by airflow and colorimetric detection with different paper test-strips. This procedure can be performed in a single analyzed solution and possesses high selectivity and good sensitivity due to the extraction step. Three types of paper test-strips were examined: paper modified with tetramethylammonium iodide and starch, paper modified with methyl orange and paper modified with silver triangular nanoplates. Limits of detection for iodide, bromide and chloride are 0.01, 0.02, and 0.04 mg L respectively in case of the last mentioned paper. The method was applied to the analysis of samples having complex matrices, such as various seafood, preserves, bread, and natural waters, showing good accuracy of the analysis with recoveries of 95-105% and relative standard deviations not higher than 6%.
一种改良的分步比色法已被开发用于测定卤化物。该方法基于连续选择性氧化碘化物、溴化物和氯化物成相应的游离卤素，通过气流萃取，并使用不同的纸条进行比色检测。这个过程可以在单一分析溶液中进行，由于萃取步骤，具有高选择性和良好的灵敏度。研究了三种类型的纸条：用碘化四甲铵和淀粉改性的纸条、用甲基橙改性的纸条和用银三角纳米板改性的纸条。最后提到的纸条的检测限为碘、溴和氯分别为 0.01、0.02 和 0.04mg/L。该方法已应用于分析具有复杂基质的样品，如各种海鲜、腌制品、面包和天然水，分析结果准确，回收率为 95-105%，相对标准偏差不高于 6%。
