Abstract
A method based on flow injection was developed for the automated determination of chemical oxygen demand (COD) that provided a number of possibilities for improvement of the limitations of the standard manual methods. The strong oxidizing agent used is cerium(IV) sulphate, which resulted in a high degree of sample oxidation under mild operating conditions. The reaction between samples and cerium(IV) ion produced a sensitive and reproducible signal, i.e., a decrease in absorbance. The detection limit and relative standard deviation of the method were 0.5 mg l-1 and 0.6% (n = 10), respectively, for a standard sample consisting of l-glutamic acid and lactose in a ratio of 5:1. When 50-μl samples were injected at a frequency of 20 h-1, the determination range was 0.5-130 mg l-1 COD. Chloride was tolerated up to a concentration of 30 g l-1 without any masking agents. COD values for various types of wastewater samples correlated well with those obtained by standard manual methods.
| Original language | English |
|---|---|
| Pages (from-to) | 237-244 |
| Number of pages | 8 |
| Journal | Analytica Chimica Acta |
| Volume | 272 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Feb 12 1993 |
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Keywords
- Cerium(IV) sulphate
- Chemical oxygen demand
- Flow injection
- UV-Visible spectrophotometry
- Waters
ASJC Scopus subject areas
- Biochemistry
- Analytical Chemistry
- Spectroscopy
- Environmental Chemistry
Cite this
Determination of chemical oxygen demand by a flow-injection method using cerium(IV) sulphate as oxidizing agent. / Korenaga, Takashi; Zhou, Xiaojing; Okada, Kimiko; Moriwake, Tosio; Shinoda, Sumio.
In: Analytica Chimica Acta, Vol. 272, No. 2, 12.02.1993, p. 237-244.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Determination of chemical oxygen demand by a flow-injection method using cerium(IV) sulphate as oxidizing agent
AU - Korenaga, Takashi
AU - Zhou, Xiaojing
AU - Okada, Kimiko
AU - Moriwake, Tosio
AU - Shinoda, Sumio
PY - 1993/2/12
Y1 - 1993/2/12
N2 - A method based on flow injection was developed for the automated determination of chemical oxygen demand (COD) that provided a number of possibilities for improvement of the limitations of the standard manual methods. The strong oxidizing agent used is cerium(IV) sulphate, which resulted in a high degree of sample oxidation under mild operating conditions. The reaction between samples and cerium(IV) ion produced a sensitive and reproducible signal, i.e., a decrease in absorbance. The detection limit and relative standard deviation of the method were 0.5 mg l-1 and 0.6% (n = 10), respectively, for a standard sample consisting of l-glutamic acid and lactose in a ratio of 5:1. When 50-μl samples were injected at a frequency of 20 h-1, the determination range was 0.5-130 mg l-1 COD. Chloride was tolerated up to a concentration of 30 g l-1 without any masking agents. COD values for various types of wastewater samples correlated well with those obtained by standard manual methods.
AB - A method based on flow injection was developed for the automated determination of chemical oxygen demand (COD) that provided a number of possibilities for improvement of the limitations of the standard manual methods. The strong oxidizing agent used is cerium(IV) sulphate, which resulted in a high degree of sample oxidation under mild operating conditions. The reaction between samples and cerium(IV) ion produced a sensitive and reproducible signal, i.e., a decrease in absorbance. The detection limit and relative standard deviation of the method were 0.5 mg l-1 and 0.6% (n = 10), respectively, for a standard sample consisting of l-glutamic acid and lactose in a ratio of 5:1. When 50-μl samples were injected at a frequency of 20 h-1, the determination range was 0.5-130 mg l-1 COD. Chloride was tolerated up to a concentration of 30 g l-1 without any masking agents. COD values for various types of wastewater samples correlated well with those obtained by standard manual methods.
KW - Cerium(IV) sulphate
KW - Chemical oxygen demand
KW - Flow injection
KW - UV-Visible spectrophotometry
KW - Waters
UR - http://www.scopus.com/inward/record.url?scp=0027475253&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0027475253&partnerID=8YFLogxK
U2 - 10.1016/0003-2670(93)80575-6
DO - 10.1016/0003-2670(93)80575-6
M3 - Article
AN - SCOPUS:0027475253
VL - 272
SP - 237
EP - 244
JO - Analytica Chimica Acta
JF - Analytica Chimica Acta
SN - 0003-2670
IS - 2
ER -