Title:
AUTOMATIC MEASUREMENT OF CONCENTRATION OF VERY SMALL AMOUNT OF CADMIUM IN WASTE WATER
Document Type and Number:
Japanese Patent JP3168826
Kind Code:
B2
Abstract:
PURPOSE: To measure the concn. of a very small amt. of cadmium in waste water.
CONSTITUTION: An inorg. acid for decomposing a nonionic cadmium compd. is added to a sample collected from waste water and the cadmium compd. is decomposed under heating to convert cadmium to a cadmium ion and an iodine complex forming agent is added to this soln. to form a cadmium complex which is, in turn, adsorbed on an anion exchange resin to be separated from other ion and, thereafter, the cadmium ion is eluted using an inorg. acid. A polyvalent ion masking agent, a pH controller, a buffer soln. and a color former are added to the eluate and the absorbancy of the developed color soln. is measured using a spectrophotometer to determine the concn. of cadmium.
Inventors:
Yasumasa Sayama
Yutaka Hayashibe
Yutaka Hayashibe
Application Number:
JP12926394A
Publication Date:
May 21, 2001
Filing Date:
June 10, 1994
Export Citation:
Assignee:
Mitsubishi Materials Corporation
International Classes:
G01N33/18; G01N21/78; G01N31/00; (IPC1-7): G01N31/00; G01N21/78; G01N33/18
Domestic Patent References:
| JP54141196A | ||||
| JP7140129A |