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Narachum V. Sreekumar Nellikalaya G. Bhat Badiadka Narayana Ronald A. Nazareth Prashant Hegde Busnur R. Manjunatha 《Mikrochimica acta》2003,141(1-2):29-33
A simple, rapid and accurate complexometric method is proposed for the determination of titanium(IV) where sodium potassium
tartrate or ascorbic acid were used as masking agents. In the presence of diverse metal ions, titanium is first complexed
with excess of EDTA and surplus EDTA is then titrated at pH 5–6 with zinc sulfate, xylenol orange being used as indicator.
An excess of 5% aqueous sodium potassium tartrate is then added to displace the complexed EDTA from the Ti-EDTA complex quantitatively,
which is titrated with zinc sulfate. Also, ascorbic acid may be used as the releasing agent. The methods work well in the
range 1–53 mg of Ti(IV) for sodium potassium tartrate with relative errors ± 0.28% and standard deviations ≤ 0.16 mg. For
ascorbic acid the range is 1.00–30.00 mg of Ti(IV) with relative errors of ± 0.40% and standard deviations of ≤ 0.05 mg
Received October 9, 2001; accepted August 2, 2002 相似文献
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B. Narayana N. G. Bhat K. S. Bhat C. H. R. Nambiar B. Ramachandra A. Joseph 《Microchemical Journal》2000,64(3)
An EDTA titration method is described for the determination of copper(II) in the presence of other ions based on the selective masking ability of 2,2′-bipyridyl. Copper and other ions in a given sample solution are initially complexed with an excess of EDTA and the surplus EDTA is titrated with lead nitrate solution at pH 5.0–6.0 (hexamine), using xylenol orange as an indicator. A known excess of 2,2′-bipyridyl solution (1% in 50% alcohol) is then added, the mixture is shaken well and the released EDTA from the Cu–EDTA complex is titrated against standard lead nitrate solution. The interference of various ions are studied and the method is applied to the determination of copper in its ores and alloys. Reproducible and accurate results are obtained for 2.54–25.40 mg of copper with S.D. values <0.04 mg. 相似文献
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白钨矿中钙和镁的快速滴定 总被引:6,自引:0,他引:6
该法简便、快速,钨的分离效果甚佳,沉淀对钙和镁吸附小,方法准确度 高,已用于白钨矿中钙和镁的连续测定,结果满意。 相似文献
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Naracham Veedu Sreekumar Ronald Aquin Nazareth Badiadka Narayana Prashant Hegde Busnur Rachotappa Manjunatha 《Mikrochimica acta》2002,140(1-2):63-67
A complexometric method for the determination of mercury in presence of other metal ions based on the selective masking ability
of potassium bromide towards mercury is described. Mercury(II) present in a given sample solution is first complexed with
a known excess of EDTA and the surplus EDTA is titrated against zinc sulfate solution at pH 5–6 using xylenol orange as the
indicator. A known excess of 10% solution of potassium bromide is then added and the EDTA released from Hg-EDTA complex is
titrated against standard zinc sulfate solution. Reproducible and accurate results are obtained for 8 mg to 250 mg of mercury(II)
with a relative error ± 0.28% and standard deviations ≤0.5 mg. The interference of various ions is studied. This method was
applied to the determination of mercury(II) in its alloys.
Received April 18, 2001 Revision October 10, 2001 相似文献
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