改进的Gran图法无标定电位法测定硝酸盐

IF 0.7 Q4 CHEMISTRY, ANALYTICAL Methods and Objects of Chemical Analysis Pub Date : 2022-01-01 DOI:10.17721/moca.2022.70-80
V. Doroshchuk, B. Oliinyk, S. Alekseev
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引用次数: 0

摘要

本文介绍了一种多重添加直接电位法测定天然和饮用淡水中硝酸盐离子的新方法。这种方法的主要特点是不需要预先校准电极和在计算中使用斜率。实验过程与经典电位滴定法非常相似。为了验证和说明该方法,在增塑膜中制备了以硝酸三十二甲基铵为离子交换剂的离子选择电极。将所提出的数学算法应用于多标准相加法获得的数据的处理,通过减少所需的操作次数,简化和加快了分析,同时保持了较高的分析精度。该方法和计算算法在取自索恩河和罗纳河(法国里昂)的天然河水的真实样本上进行了测试;在低矿化度天然水体中,以10 mg L-1对应最大允许浓度的1/5的水平测定硝酸盐的可能性。
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Modified Gran’s Plot Method for Calibrationless Potentiometric Nitrate Determination
This article demonstrates a new approach of multiple additions direct potentiometric determination of nitrate ion in natural and potable freshwater. The main feature of this approach is no need to pre-calibrate the electrode and to use the slope in the calculations. The experimental procedure is very similar to one of classic potentiometric titration. To test and illustrate the approach, ion-selective electrodes with tridodecylmethylammonium nitrate as ion-exchanger in plasticized membrane were produced. The application of the proposed mathematical algorithm for processing of data obtained by the method of multiple standard additions simplifies and speeds up the analysis by reducing the number of required manipulations, while maintaining high accuracy of analysis. The work of the method and calculation algorithm were tested on real samples of natural river water taken from the rivers Saone and Rhone (Lyon, France); possibility of nitrate determination in low mineralized natural waters at the level of 10 mg L-1 corresponding to 1/5 of maximum allowable concentration was shown.
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来源期刊
CiteScore
1.00
自引率
14.30%
发文量
12
期刊介绍: The journal "Methods and objects of chemical analysis" is peer-review journal and publishes original articles of theoretical and experimental analysis on topical issues and bio-analytical chemistry, chemical and pharmaceutical analysis, as well as chemical metrology. Submitted works shall cover the results of completed studies and shall make scientific contributions to the relevant area of expertise. The journal publishes review articles, research articles and articles related to latest developments of analytical instrumentations.
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