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A spectrophotometric method for the determination of Fe(II) in the presence of large amounts (up to 800 mg/l.) of Fe(III) is suggested. The Fe(III) is effectively masked by complexing with fluoride at pH 2.0-2.4 before development of the violet Fe(II) complex with 2,4,6-tri(2'-pyridyl)-1,3,5-triazine. The absorbance is measured at 595 nm. Various commonly occurring ions which complex with Fe(II) and/or Fe(III) do not interfere. 相似文献
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Proceedings - Mathematical Sciences - In each of the cases of LiOH, LiOH·H2O, NaOH, Ca(OH)2 and Mg (OH)2 the stretching vibrations of the hydroxyls antisymmetrically with respect to the centre... 相似文献
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Raman spectrum of magnesite 总被引:1,自引:0,他引:1
D. Krishnamurti 《Proceedings Mathematical Sciences》1956,43(4):210-212
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Summary A capillary zone electrophoretic method for the analysis of phenolic acids in soil and plant extracts was developed with direct
UV detection using a phosphate electrolyte solution. The electrophoretic separation required the phenolic acids to be charged
at a pH above their pKa in order to achieve their migration towards the anode. Electroosmotic flow (EOF) was reversed in direction by adding tetradecyltrimethylammonium
bromide (TTAB). Factors affecting the separation selectivity, including the buffer pH and EOF modifiers, were investigated
systematically. Eight phenolic acids were separated and detected in 10 min using an electrolyte containing 25 mM phosphate,
0.5 mM TTAB and 15% acetonitrile (v/v) at pH of 7.20. Linear plots for the test phenolic acids were obtained in a concentration range of 0.01–1 mM with detection
limits in the range of 1.0–7.0 μM. The recoveries ranged from 92.8 to 102.3% in soil and plant tissues samples spiked at 100
μM and the relative standard deviation based on the peak area were ranged 2.0 to 4.5%. The proposed method was used for the
determination of phenolic acids in plant tissue and soil extracts with direct injection. 相似文献
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The paper reports the refractive index and density data of N-(p-propoxybenzylidene)p-pentylaniline and N-(p-butoxybenzylidene)p-pentylaniline in the nematic and liquid phases. The orientational order parameters for these two compounds are discussed. 相似文献