Deveropment of a continuous monitoring system for an acid rain based on null-point potentiometry
Project/Area Number |
07640801
|
Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
分離・精製・検出法
|
Research Institution | Shiga Univ. |
Principal Investigator |
HARA Hirokazu Shiga Univ.Faculty of Education Prof., 教育学部, 教授 (50142287)
|
Project Period (FY) |
1995 – 1996
|
Project Status |
Completed (Fiscal Year 1996)
|
Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1996: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1995: ¥1,600,000 (Direct Cost: ¥1,600,000)
|
Keywords | Rain water analysis / Fluoride / Nitrate / Continuous-flow analysis / Ion-selective electrode / Potentiometry / Acid rain / Null-point potentiometry / 連続分析法 |
Research Abstract |
(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.
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Report
(3 results)
Research Products
(6 results)