Institute of Graduate Studies, Chemistry Department, Istanbul University-Cerrahpaşa, Avcilar, Istanbul, Turkey; Engineering Faculty, Chemistry Department, Istanbul University-Cerrahpaşa, Avcilar, Istanbul, Turkey.
Engineering Faculty, Chemistry Department, Istanbul University-Cerrahpaşa, Avcilar, Istanbul, Turkey.
Talanta. 2021 May 1;226:122187. doi: 10.1016/j.talanta.2021.122187. Epub 2021 Feb 4.
Ammonium dinitramide (ADN) is a strong, environmentally friendly oxidizer used in composite solid rocket propellants. As there is no reliable colorimetric sensor for ADN assay applicable to in-field screening, we developed a sensitive and practical sensing method to determine it in the presence of other explosives and possible interferents, based on the detection of nitrite formed from ADN degradation under UV light in a slightly alkaline (i.e. of lower alkalinity than needed to hydrolyze nitramines) solution by a nanoparticle-based colorimetric sensor. The ADN-derived nitrite formed a colored product via a Griess reaction using gold nanoparticles modified with 4-aminothiophenol (4-ATP-AuNPs) along with a coupling reagent N-(1-naphthyl)ethylene diamine (NED) for forming an azo dye. The method used for ADN detection could also be applied to tetryl samples at a different wavelength. The limit of detection (LOD) was 0.012 mg L for ADN and 0.615 mg L for tetryl. Interference effects of energetic materials like trinitrotoluene (TNT), hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX), octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) and pentaerythritol tetranitrate (PETN) to ADN determination could be overcome. In addition, common soil ions did not adversely affect the nanosensor performance. The developed method was statistically validated against reference voltammetric, UV, and HPLC methods using t- and F- tests.
硝酸铵二肼（ADN）是一种强力的、环境友好型氧化剂，用于复合固体火箭推进剂。由于目前尚无适用于现场筛选的可靠 ADN 比色传感器，我们开发了一种基于纳米粒子比色传感器的灵敏且实用的传感方法，用于在存在其他爆炸物和可能的干扰物的情况下测定 ADN。该方法基于 ADN 降解在弱碱性条件下（即比硝胺水解所需的碱性低）下在紫外光下生成的亚硝酸盐的检测，通过金纳米粒子与 4-巯基苯胺（4-ATP-AuNPs）和偶联试剂 N-(1-萘基)乙二胺（NED）一起形成用于形成偶氮染料的 Griess 反应，形成有色产物。该方法还可以应用于不同波长的特里尔样品进行 ADN 检测。ADN 的检测限（LOD）为 0.012mg/L，特里尔的 LOD 为 0.615mg/L。三硝基甲苯（TNT）、六氢-1,3,5-三硝基-1,3,5-三嗪（RDX）、八氢-1,3,5,7-四硝基-1,3,5,7-四唑（HMX）和季戊四醇四硝酸酯（PETN）等含能材料对 ADN 测定的干扰作用可以克服。此外，常见的土壤离子不会对纳米传感器的性能产生不利影响。该方法使用 t-和 F-检验，通过与参考伏安法、UV 和 HPLC 方法的统计验证。
