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首页> 外文期刊>Analytica chimica acta >Griess micro-assay for the determination of nitrite by combining fibre optics-based cuvetteless UV-Vis micro-spectrophotometry with liquid-phase microextraction
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Griess micro-assay for the determination of nitrite by combining fibre optics-based cuvetteless UV-Vis micro-spectrophotometry with liquid-phase microextraction

机译：结合基于光纤的无比色皿紫外可见分光光度法与液相微萃取相结合的Griess微分析法测定亚硝酸盐

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摘要

A novel, simple and low cost method for the determination of nitrite using headspace single-drop microextraction and cuvetteless ultraviolet-visible micro-spectrophotometry is described. A Griess reagent-containing aqueous microdrop exposed to the headspace was used as extractant of the volatile nitrogen oxides generated from nitrite by direct acidification of the aqueous sample. Experimental parameters affecting the headspace single-drop microextraction performance such as composition and volume of the extractant phase, sample volume, concentration of acetic acid, ionic strength, sample agitation, temperature and microextraction time were systematically examined. Measurements were carried out at 540 nm under optimized conditions. A detection limit of 1.5 μg L~(-1) and an enrichment factor of 193 were achieved. Intra-day repeatability and inter-day reproducibility, expressed as relative standard deviation, were 3.5% (n = 7) and 10.6% (three consecutive days), respectively. The proposed method, characterized by its enhanced sensitivity and selectivity in comparison with the standardized colorimetric assay, was successfully applied to the analysis of several environmental water samples.
机译：介绍了一种使用顶空单滴微萃取和无比色皿紫外可见微分光光度法测定亚硝酸盐的新颖，简单，低成本的方法。暴露于顶部空间的含Griess试剂的含水微滴用作通过直接酸化含水样品而从亚硝酸盐生成的挥发性氮氧化物的萃取剂。系统地研究了影响顶空单滴微萃取性能的实验参数，例如萃取剂相的组成和体积，样品体积，乙酸浓度，离子强度，样品搅拌，温度和微萃取时间。在最佳条件下于540 nm进行测量。检测限为1.5μgL〜（-1），富集因子为193。以相对标准偏差表示的日内重复性和日间重现性分别为3.5％（n = 7）和10.6％（连续3天）。该方法与标准比色法相比具有更高的灵敏度和选择性，已成功应用于多种环境水样的分析。

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