期刊
ANALYTICA CHIMICA ACTA
卷 476, 期 1, 页码 159-165出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0003-2670(02)01362-4
关键词
cyanide ion; complexometric titration; equivalence point; nickel ion; murexide; uncertainty
In a nickel titration of cyanide ions using murexide as indicator, an accurate equivalence point was determined by a non-hnear least-squares curve-fitting for a titration curve. This method was developed to establish a standard solution for cyanide ions. In a curve-fitting procedure, a theoretical titration curve was calculated, assuming that nickel ion formed only a 1:4 Ni2+:CN- complex with cyanide ions and formed only a 1:1 complex with murexide. Results of the curve-fitting were reasonable at any pH and any indicator concentration studied. The combined standard uncertainty for a concentration of a 1000 mg kg(-1) cyanide solution by this method was 0.079%. (C) 2002 Elsevier Science B.V. All rights reserved.
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