JPS5550159A - Cod measurement - Google Patents

Cod measurement

Info

Publication number
JPS5550159A
JPS5550159A JP12375278A JP12375278A JPS5550159A JP S5550159 A JPS5550159 A JP S5550159A JP 12375278 A JP12375278 A JP 12375278A JP 12375278 A JP12375278 A JP 12375278A JP S5550159 A JPS5550159 A JP S5550159A
Authority
JP
Japan
Prior art keywords
earth metal
alkaline earth
phosphate salt
cod
correct
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
Application number
JP12375278A
Other languages
Japanese (ja)
Inventor
Akira Segawa
Fumio Nakagawa
Ryosuke Fukushima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Horiba Ltd
Original Assignee
Horiba Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Horiba Ltd filed Critical Horiba Ltd
Priority to JP12375278A priority Critical patent/JPS5550159A/en
Publication of JPS5550159A publication Critical patent/JPS5550159A/en
Pending legal-status Critical Current

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  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)

Abstract

PURPOSE: To simply mask an alkaline earth metal so that the correct COD may be measured by adding phosphoric acid or soluble phosphate salt to test water thereby to remove the alkaline earth metal compound.
CONSTITUTION: In order to prepare a phosphate salt of an alkaline earth metal, prior to the oxidization of permanganate, sodium dihydrogen phosphate is added in a quantity equal to or more than the alkaline earth metal as phosphoric acid or an additive containing a phosphate radical or an aqueous solution of soluble phosphate salt. As a result, the phosphate salt, which cannot be easily dissolved, can be precipitated. Thus, the alkaline earth metal can be easily masked to eliminate the ingerference thereof so that the correct COD can be obtained.
COPYRIGHT: (C)1980,JPO&Japio
JP12375278A 1978-10-05 1978-10-05 Cod measurement Pending JPS5550159A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12375278A JPS5550159A (en) 1978-10-05 1978-10-05 Cod measurement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12375278A JPS5550159A (en) 1978-10-05 1978-10-05 Cod measurement

Publications (1)

Publication Number Publication Date
JPS5550159A true JPS5550159A (en) 1980-04-11

Family

ID=14868426

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12375278A Pending JPS5550159A (en) 1978-10-05 1978-10-05 Cod measurement

Country Status (1)

Country Link
JP (1) JPS5550159A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6457192U (en) * 1987-09-30 1989-04-10

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6457192U (en) * 1987-09-30 1989-04-10
JPH0545665Y2 (en) * 1987-09-30 1993-11-24

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