Abstract

A fast, efficient, and non-chromatographic method was presented in this study for nitrite, nitrate, and p-nitrophenol (N-compounds) extraction and speciation analysis of environmental samples. By applying ultrasound-assisted solid–liquid extraction (USLE), analytes were efficiently extracted from water, soil, or sediment collected in areas of environmental disaster. These analytes were selectively converted to NO_(g) through UV photolysis (NO₃⁻), H₂O₂/UV photocatalysis (PNP), and direct conversion (NO₂⁻). Following conversion, NO_(g) was separated from the liquid phase and determined by high-resolution continuum source molecular absorption spectrometry (HR-CS MAS). The LODs obtained were 0.097 ± 0.004 mg L⁻¹ for nitrite, 0.119 ± 0.004 mg L⁻¹ for nitrate, and 0.090 ± 0.006 mg L⁻¹ for p-nitrophenol. On applying this speciation method to environmental samples, concentrations were found to be up to 0.99 ± 0.03 mg L⁻¹ (NO₂⁻), 49.80 ± 2.5 mg L⁻¹ (NO₃⁻), and 0.10 ± 0.02 mg L⁻¹ (PNP). Finally, addition/recovery study of real water, soil, and sediment samples showed 101 ± 2% recovery for NO₂⁻, 100 ± 1% for NO₃⁻, and 96 ± 5% for PNP.

Graphical abstract

中文翻译：

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使用超声辅助固液萃取和非色谱技术对环境样品中的N化合物进行形态分析

摘要

本研究提出了一种快速，高效且非色谱的方法，用于亚硝酸盐，硝酸盐和对硝基苯酚（N化合物）的提取以及环境样品的形态分析。通过应用超声辅助固液萃取（USLE），可以从环境灾难地区收集的水，土壤或沉积物中有效地提取分析物。这些分析物选择性地转化为NO _（克）通过紫外光解（NO ₃ ^-，H）₂ ö ₂ / UV光催化（PNP），和直接转换（NO ₂ ^- ）。转换后，NO _（g）从液相中分离并通过高分辨率连续谱源分子吸收光谱法（HR-CS MAS）测定。所获得的检测限为0.097±0.004毫克的L ^-1为亚硝酸盐，0.119±0.004毫克的L ^-1硝酸盐，和0.090±0.006毫克的L ^-1为p硝基苯酚。关于应用该方法形态至环境样品，发现浓度为高达0.99±0.03毫克的L ^-1（NO ₂ ^- ），49.80±2.5毫克的L ^-1（NO ₃ ^- ），和0.10±0.02毫克的L ^-1（PNP）。最后，实际水，土壤和沉积物样品加法/恢复研究表明为NO 101±2％的回收率₂ ^-，100±1％为NO ₃ ^- ，和96±5％的PNP。

图形概要