#orContributorsdownloads.hindawi.com/journals/jamc/1981/474315.pdf · pp783. [4] Nora,G. (1975),AnalyticalChemistry, 47, 7.63. [5] Ross,J.W. (1976),Science, 156, 1378. APPENDIX The

Korenaga Continuous monitoring

4. The order of selectivity is C104- >l- >SCN- >NOa- >Br->C103->C1->HSOa-, CHACO0-, HCOa-, H2PO4- orSO42- for the liquid membrane electrode, and 1->Br->SCN- >HSO3- >C1- >C104- NOa-, C103-, CHaCOO-,HCOa-, H2 PO4- or SO42- for the solid membrane electrode.The life of electrode is 22 and 23. days for the liquid andsolid membrane electrodes respectively, using an ultrasonicwave cleaner. During the continuous monitoringofthiocyanateat 5.8 ppm in actual industrial waste water samples, themaximum permissible concentrations of co-existing chlorideand nitrate ions are 2000 (C1-) and 6 (NOa-) ppm and8 (C 1-) and >3000 (NOa-) ppm for the liquid and solid mem-brane electrodes respectively.

The effect of temperature, within-day and day-to-dayprecision, automatic cleaning of electrode, and maintenanceof electrode were also evaluated, but the author can find nodifference between the liquid and solid membrane electrodesin this respect.

The method of using a thiocyanate ion-selective electrodewith liquid membrane recommended here seems to besuperior to that of using a cyanide ion-selective electrodefor the determination of thiocyanate since the latter has athree stop procedure for a quantitative transformation ofthiocyanate into cyanide 4].

It is therefore concluded that for continuous monitoringof thiocyanate in environmental water samples such asnatural and waste waters containing less than 2000 ppmchloride and a few ppm nitrate only a liquid membraneelectrode gives satisfactory results.

ACKNOWLEDGEMENTThe author is greatly indebted to Professor Kyoji T6ei and Dr ShojiMotomizu of Okayama University for their encouragement, and alsoto Japan Exlan Co, Ltd for permission to publish this paper.

REFERENCES1] Korenaga, T. (1979),Mikrochimica Acta[Wien],II, 455.

[2] Toei, K. and Kawada, K, (1972),Japan Analyst, 21, 1510.[3] Snell, F.D. and Snell, C.T. (1958), "Colorimetric Methods of

Analysis", Vol II, 3rd Edition, Van Nostrand, New York, USA,pp 783.

[4] Nora, G. (1975),Analytical Chemistry, 47, 7.63.[5] Ross, J.W. (1976), Science, 156, 1378.

APPENDIXThe chemistry of the spectrophotometric method for the deter-mination of thiocyanate [3] is as follows. A ferric nitrate reagentsolution was prepared by dissolving 50 g of the salt in 500 mlof distilled water, adding 25 ml of concentrated nitric acid, anddiluting litre with distilled water. To 5 ml of clear filtrate of samplesolution, was added ml of the ferric nitrate reagent solution and after5 min the absorbance of ferric thiocyanate formed at 550 nm wasmeasured using a reagent blank as reference. The concentration ofthiocyanate in the sample solution is determined by comparing theseresults against a calibration curve prepared from a standard sodiumthiocyanate solution.

[IIIII IIIIIII IIIIIII|IIIIII III IIII-, IIIIIIIII

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#orContributorsdownloads.hindawi.com/journals/jamc/1981/474315.pdf · pp783. [4] Nora,G. (1975),AnalyticalChemistry, 47, 7.63. [5] Ross,J.W. (1976),Science, 156, 1378. APPENDIX The