NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL & TECHNOLOGY
发明人:
HIRATA SHIZUKO
申请号：
JP20030400369
公开号：
JP2005164289(A)
申请日:
2003.11.28
申请国别(地区):
日本
年份:
2005
代理人:
摘要：
PROBLEM TO BE SOLVED: To provide a method of measuring a nitrite ion and an nitrate ion capable of shortening a measuring time and capable of simplifying constitution, because the nitrite ion and the nitrate ion are measured concurrently by the same measuring instrument, and provide its instrument. SOLUTION: Sample water is measured automatically by simple constitution via two six-way valves 2, 3. When measuring nitrate ion concentration, the sample water is passed through a cadmium-copper column 4, and the nitrate ion is reduced to the nitrite ion to be measured. When measuring only the nitrite, the measurement therefor is carried out by the same instrument without passing the cadmium-copper column 4, and a nitrate ion concentration is found on the basis of a difference between the both. A mixture solution 9 mixed with a coloring reaction solution in the sample water is measured by a detector of a light emitting diode 10a and a photodiode 10b. COPYRIGHT: (C)2005,JPO&NCIPI
