Deveropment of a continuous monitoring system for an acid rain based on null-point potentiometry

基于零点电位法的酸雨连续监测系统的研制

• 批准号: 07640801
• 负责人: HARA Hirokazu
• 金额: $ 1.47万
• 依托单位: Shiga Univ.
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07640801/
• 关键词: Rain water analysis; Fluoride; Nitrate; Continuous-flow analysis; Ion-selective electrode; Potentiometry; Acid rain; Null-point potentiometry; 連続分析法

(1) A new buffer based on glycine/HCL pH2.80 was proposed for the determination of very low concentrations of free-fluoride in eain water, by using the continuous-flow analysis system with a fluoride ion-selective electrode detector. (2) A new nitrate ion-selective electrode based on his (bathocuproin) copper (II) nitrate ion-exchanger was developed and applied to the time-course observation of nitrate concectration in an acid rain by using the continuous-flow analysis system. (3) A novel continuous-flow analysis system for nitrate in an acid rain was developed, which is based on null-point potentiometry. In this sytem, a nitrate ion-selective membrane based on triotadecylmethylammonium nitrate ion-exchanger was used as a detector. The membrane potential between the sample and standard sides was kept automatically so as to be (]sy.+-.[)1 mV by controlling the dilution rate of a standard KNO3 solution. The concentration of a sample solution is displayd 5-10min after its injection into the flow system. The accuracy and precision of the independent five measurements were within about 5%. This system was applied to rain water analysis.

(1)提出了一种新型甘氨酸/盐酸pH2.80缓冲液，采用氟离子选择性电极检测器连续流分析系统，用于测定水中极低浓度的游离氟。(2)研制了一种新型硝酸盐离子选择电极，该电极基于铜（II）硝酸盐离子交换剂，并应用于连续流分析系统对酸雨中硝酸盐浓度的时程观测。(3)研制了一种基于零点电位法的酸雨中硝酸盐连续流分析系统。在该系统中，采用基于三十二基甲基硝酸铵离子交换剂的硝酸盐离子选择膜作为检测器。样品与标准侧之间的膜电位自动保持为(]sy.+-。[)1 mV通过控制标准KNO3溶液的稀释率。样品溶液在注入流动系统后5-10min显示其浓度。独立5次测量的准确度和精密度均在5%左右。该系统已应用于雨水分析。

项目成果

H. Hara, Chun-ching Huang: "Buffer composition suitable for determining very low flucride concentrations using a fluoride ion-selective electrode and its application to the continuous analysis of rain water" Analytica Chimica Acta. (印刷中). (1997)

H. Hara、Chun-ching Huang：“适用于使用氟离子选择性电极测定极低氟化物浓度的缓冲液组合物及其在雨水连续分析中的应用”Analytica Chimica Acta（1997 年出版）。