发明名称 |
SIMPLIFIED MEASURING METHOD FOR COD, AND SPECTROPHOTOMETER USED THEREFOR |
摘要 |
PROBLEM TO BE SOLVED: To carry out COD measurement more simply and economically than a JIS method. SOLUTION: One-tenth amounts or less of sample water and reagents compared with a JIS method are put in a test tube to be heated for 30 minutes at 100 deg.C by a block heater, then cooled to stop imediately reaction, filtered with inorganic filter paper having 1.0μm of holding particle size or less, a concentration of a permanganate ion in a filtrate is measured thereafter using absorbance in the vicinity of 525 nm or 543 nm, and a COD is calculated based on a reduced amount thereof. A spectrophotometer built-in with a program of an operation expression [expresssion (8)] for the COD based on absorbance reduction, and capable of digital-displaying an operation result is used to allow direct reading of a COD value.
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申请公布号 |
JP2000088840(A) |
申请公布日期 |
2000.03.31 |
申请号 |
JP19980279358 |
申请日期 |
1998.09.14 |
申请人 |
URANO KOHEI;CENTRAL KAGAKU KK |
发明人 |
URANO KOHEI;ISHII SEIJI;HAYASHI KUMIKO |
分类号 |
G01N21/77;G01N33/18;(IPC1-7):G01N33/18 |
主分类号 |
G01N21/77 |
代理机构 |
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地址 |
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