| Author | Naraporn Hanvajanawong |
| Call Number | AIT Thesis no. EV-79-32 |
| Subject(s) | Chemical oceanography
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Two methods for COD determination are proposed to be used with samples containing chloride ions up to 18,000 mg/t .
In the first method, potassium dichromate is used as an oxidant in open tube for two hours at 145°c in a controlled temperature oil bath. The use of a 54-position digestion rack and cylindrical vessels with long
tubes allows determination of 27 samples per 2 hours. The formula for calculating COD values modified from Wagner formula to obtain better results. The COD results of pure chemicals obtained after correction are about 98.5 - 100.6% over a wide range of sodium chloride concentrations.
While in the second method, eerie sulfate, one of the powerful oxidizing agents is used instead of potassium dichromate. The procedure is the same as that in the Standard Method but only one reflux hour is needed.
The COD results of pure chemical obtained after correction are about 98.4 - 102.6% over a wide range of sodium chloride concentrations.
The results of the proposed methods are compared with the results of the Standard Method and Jeris Method in terms of their cost, effectiveness
and suitability. |
| Year | 1979 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Environmental Engineering and Management (EV) |
| Chairperson(s) | Samorn Muttamara ;Nguyen, Cong Thanh
|
| Examination Committee(s) | Chongrak Polprasert |
| Scholarship Donor(s) | Government of Republic of Germany |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1979 |