JPS5550158A - Cod measurement - Google Patents
Cod measurementInfo
- Publication number
- JPS5550158A JPS5550158A JP12375178A JP12375178A JPS5550158A JP S5550158 A JPS5550158 A JP S5550158A JP 12375178 A JP12375178 A JP 12375178A JP 12375178 A JP12375178 A JP 12375178A JP S5550158 A JPS5550158 A JP S5550158A
- Authority
- JP
- Japan
- Prior art keywords
- magnesium
- phosphate
- ion
- ammonium
- cod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
PURPOSE: To make it possible to measure the accurate COD by adding magnesium salt and phosphate, which are soluble in test water, so that the magnesium ammnium phosphate may be precipitated and removed.
CONSTITUTION: To the test water to have its COD measured by the alkali method, a soluble magnesium salt such as magnesium sulfate and a soluble phosphate such as its secondary salt are added together with an alkali metal salt and ammonium thereby to precipitate the magnesium ammonium phosphate. By setting the pH of this solution at 9.5W10.5, the ammonium ion left in the solution can be minimized. Moreover, the relationship between the magnesium ion and phosphate ion is made such that ammonium ion < magnesium ion < phosphate ion. Thus, the ammonium ion acting as an interfeerence substance can be effectively eliminated so that the correct COD can be obtained.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12375178A JPS5550158A (en) | 1978-10-05 | 1978-10-05 | Cod measurement |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12375178A JPS5550158A (en) | 1978-10-05 | 1978-10-05 | Cod measurement |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5550158A true JPS5550158A (en) | 1980-04-11 |
Family
ID=14868403
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12375178A Pending JPS5550158A (en) | 1978-10-05 | 1978-10-05 | Cod measurement |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5550158A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103698379A (en) * | 2013-03-28 | 2014-04-02 | 浙江大学 | Solid ammonium ion electrode based on magnesium ammonium phosphate and preparation method of solid ammonium ion electrode |
-
1978
- 1978-10-05 JP JP12375178A patent/JPS5550158A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103698379A (en) * | 2013-03-28 | 2014-04-02 | 浙江大学 | Solid ammonium ion electrode based on magnesium ammonium phosphate and preparation method of solid ammonium ion electrode |
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