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<正> 当前,离子选择性电极已广泛用于海洋化学领域,对于海水中微量硫化物的测定,与碘量法和比色法相比较,电极法不仅灵敏、简便,而且能够实现对环境或体系中硫化物的连续自动监测。特别对于海洋底质间隙水中硫化物的现场测定,电极法更有独到之处。已往报导使用硫离子选择性电极测定天然水中硫化物的方法中,通常采用硫化银压片成膜电极。这种电极具有比较稳定的响应性能,但是对于低浓度硫化物则响应较慢,电极结构不适于底质样品和微区测量。Berner所用化学成膜硫电
Abstract：A method is described for the determination of sulfide in sea water by ion selectivee electrode in which the electroactive membrane is made out of Ag2S formed by electrochemical technique. The backgroud electrolyte solution is 1 M NaOH containing 5mg/ml ascorbic acid as antioxidant reagent. A linear near Nernst response with the slope of 29.8±0.2 mv/logCsr is obtained over the total sulfide concentration range from 10-3Mto 10-7M for the sea water having different salinity ( 5-35% ). The average standard deviation of the odserved potentials is 0.6mv, and the relative standard deviation of the sulfide concentration is 5 %. The experimental recovery of sulfide is 101±5%. The detection limit of sulfide is about 6 ×10-8M. The interferences of some heavy metals on the electrode rea-pone were tested, the obvious interferences of Cd, Pb and Cu can be eliminated by addition of Na2H2EDTA and NaDDTC respectivily. Data obtaiued for the sea water samples by calibration curve, standard addition and graphical method are in good agreement.
[1] T.B. Warner, Ion selective electrodes-Properties and uses in sea water, Marine Technol. Soc, J., 6, 24, 1972．
[2] M. Whitfield, The electroanalytical chemistry of sea water, in "Chemical Oceanography" (J. P. Riley and G. Skirrow, eds.),Academic Press,1975．
[3] 李延,王庆璋,东海沉积物的氧化-还原平衡分布,“中国海洋湖沼学会第三届代表大会暨学术年会论文汇编”(2) ,315,1979。
[4] E. W. Baumann, Determination of parts per billion sulfide in water with the sulfide-selective electrode, Anal. Chem., 46, 1345,1974．
[5] E. Mor, V. Scotto, G. Marcenaro and G. Alabiso, The use of membrane electrodes in the determination of sulphides in sea water,Anal. Chim. Acta, 75, 159, 1975．
[6] R. A.Berner. Electrodes studies of hydrogen sulfide in marine sediments, Geochim. et Cosmochim. Acta,27,563,1963．
[7] 山东海洋学院,电化膜电极的试制与应用-使用铜离子选择性电极连续监测铜合金在海水中的溶铜速率,“海洋用钢腐蚀研究”(上海钢铁研究所主编),上海科学技术出版社,167,1978．
[8] 湖南大学化工系分析化学教研室,硫离子选择性电极的分析性能试验,分析化学,1,24,1974．
[9] C.J. Rix and A. M. Bond. Direct determination of fluoride in sea water with a fluoride selective ion electrode by a method of standard additions, Anal.Chem., 48, 1236, 1976．
[10] Instructions for F_(1212s) and F_(1712s) sulphide selectrodes, Radiometer A/S.Emdrupve) 72． DK-2400,Copenhagen NV Denmark.
[11] R. Parsons, "Handbook of electrochemical constants", Butterworths,London,1959．
基本信息:
DOI：10.16441/j.cnki.hdxb.1980.03.007
引用信息:
[1]王庆璋,谈岳华.应用电化膜硫电极测定海水中的硫化物[J].山东海洋学院学报,1980(03):64-74.DOI:10.16441/j.cnki.hdxb.1980.03.007.
1980-09-30
1980-09-30