共查询到20条相似文献,搜索用时 431 毫秒
1.
I. Sridhar Reddy P. Chandrasekhar Reddy B. Rangamannar 《Journal of Radioanalytical and Nuclear Chemistry》1991,153(5):333-338
An accurate and rapid radiochemical method has been developed for the determination of silver based on the substoichiometric extraction of its complex with potassium 3-phenylmethyldithiocarbazate into chloroform from pH 5.5 acetate buffer. Microgram amounts of silver could be determined with an average error of ±1.1% and the effect of diverse metal ions was critically examined. The method developed was applied to evaluate the silver content of photofilm washings. 相似文献
2.
H. Sakamoto H. Imura K. Ohashi 《Journal of Radioanalytical and Nuclear Chemistry》2000,243(3):737-740
Substoichiometric isotope dilution analysis for the determination of trace iron has been studied by using synergistic extraction of iron(III) with a substoichiometric amount of 4-isopropyltropolone (Hipt) in the presence of an excess of 3,5-dichlorophenol (DCP) in heptane. Optimum conditions for the substoichiometric extraction of iron(III) in g to sub-g levels were examined and the high selectivity for iron(III) toward various metal ions encountered in the analysis of biological materials was confirmed. The present method was applied to a biological reference material (NIES, CRM No.9, sargasso) without any pre-separation and was successfully evaluated. Furthermore, substoichiometric stable isotope dilution mass spectrometry using the present extraction method was also used with the above sample. Applicability and practicability was compared for both substoichiometric methods. 相似文献
3.
A new procedure for the substoichiometric extraction of bivalent manganese by thenoyltrifluoroacetone into ethyl acetate has been developed and used in activation analysis. The value of the extraction constant has been found to be 3.1 x 10(-6); the pH range in which the extraction can be performed is 7.8-9.2. The influence of oxalate, citrate, tartrate, fluoride and cyanide ions has been studied. A selective substoichiometric extraction of manganese in the presence of Zr, Hf, Nb, Th, Fe and Sc is possible at pH 8-8.5, tartrate and fluoride being used as masking agents. Copper and cobalt can be screened by ammonia and cyanide respectively. The method has been used for the determination of manganese in biological materials, potassium fluoride and zirconium. 相似文献
4.
A method has been developed for the quantitative extraction of Ni/II/ with isonitrosobenzoylacetone /HINBA/ into chloroform. The effect of various parameters on the extraction coefficient value such as pH, time of equilibration, effect of solvents, anions, cations etc. have been studied. The stoichiometry of the metal: reagent determined by the method of substoichiometric extraction and slope ratio method was found to be 12. Decontamination factors for many elements in the substoichiometric extraction of Ni/II/ were also evaluated. 相似文献
5.
B. Polaiah K. V. Muralikrishna B. Rangamannar 《Journal of Radioanalytical and Nuclear Chemistry》1993,175(5):351-357
In the present investigation, a simple and selective radioanalytical method for the evaluation of selenium in microgram amounts by substoichiometric isotope dilution analysis has been developed. Potassium benzyl xanthate has been employed as the reagent. The colorless selenium-benzyl xanthate complex was extracted into chloroform. The influence of various ions during the extraction was also critically examined. The method developed has been successfully applied for the analysis of a few agricultural products for selenium. 相似文献
6.
A substoichiometric radiochemical solventextraction method is described for the determination of cobalt, employing β-hydroxy-naphthaldoxime and chloroform as reagent and extractant, respectively. The extraction behaviour of the complex of cobalt with the reagent in the pH-range 8–9.5 and the effects of various metal ions on the extraction are critically studied. The method is used to determine the cobalt content in some pharmaceutical drugs. 相似文献
7.
T. M. Bahrainwala Z. R. Turel 《Journal of Radioanalytical and Nuclear Chemistry》1998,237(1-2):175-178
A new and rapid method has been developed for the quantitative extraction of Ru(III) with 2-mercaptobenzimidazole into n-butanol.
The extraction coefficient of Ru(III) between n-butanol and an ethanolic solution of 1% 2-mercaptobenzimidazole showed a maximum
value ofE=161 at a pH of 2.0. The effect of various other parameters on the extraction coefficient value of Ru(III) such as solvent
effect, anions, cations, etc. have also been studied. The stoichiometry of metal to reagent has also been determined by the
method of substoichiometric extraction and by the slope ratio method and was found to be 1∶3. Decontamination factor for various
elements in the substoichiometric extraction of Ru(III) were also evaluated. 相似文献
8.
Determination of mercury (II) by substoichiometric extraction with malonic anilide into a mixture of ether and MIBK is reported. The method has been applied in the estimation of the metal in industrial effluents. 相似文献
9.
A rapid and selective method has been developed for the determination of cadmium in environmental samples by thermal neutron activation analysis, employing substoichiometric solvent extraction technique. Alcoholic solution of 2-mercaptobenzothiazole /2-HMBT/ has been used for the substoichiometric extraction of Cd/II/ from an aqueous solution of pH 7.0 into methyl iso-butyl ketone /MIBK/. 相似文献
10.
The method of substoichiometric separation is completed for radioactivity measurements using special nuclear measurement methods in a way that along with the substoichiometric extraction of a given metal the simultaneous quantitative separation of other metals can also be effected. Some general relationships have been derived for the substoichiometric multielement separation of MA m -type metal chelates. Particularly, the primary dithizonates of silver and copper(II) have been studied, and the application of the method is demonstrated by the separation of silver and copper from cobalt. 相似文献
11.
A rapid radiochemical method has been designed for the determination of microgram quantities of zinc, based on the substoichiometric isotope dilution, using potassium ethyl xanthate as the extraction reagent. pH 5.5 in acetate buffers and chloroform as the extractant were found to be suitable for quantitative substoichiometric extraction. The influence of the diverse ions on the extraction was studied. The zinc contents of a medicinal preparation and biological samples were determined by the present method. 相似文献
12.
T. M. Bahrainwala Z. R. Turel 《Journal of Radioanalytical and Nuclear Chemistry》1998,237(1-2):179-182
2-mercaptobenzothiazole has been used for the solvent extraction of Os(IV) in acidic medium. The extraction of Os(IV) was
found to be better than 90% over the pH range of 3.0 to 5.0 with an equilibration time of 5.0 minutes. The stoichiometry of
metal:reagent determined by substoichiometric extraction and slope ratio method was found to be 1∶4. Decontamination factor
for various elements in the substoichiometric extraction of Os(IV) were also evaluated. 相似文献
13.
A new and rapid method has been developed for the quantitative extraction of Ru/III/ with 1,2,3-benzotriazole /1,2,3-BT/ into 1-pentanol. The extraction coefficient value of Ru/III/ between 1-pentanol and an aqueous 5% solution of 1,2,3-BT in 2M sodium acetate-acetic acid buffer showed a maximum value of E=46 at pH 4.5. The effect of various other parameters on the extraction coefficient of Ru/III/ such as solvents, anions, cations, etc. have also been studied. The stoichiometry of metal:reagent determined by the method of substoichiometric extraction and slope ratio method was found to be 13. Decontamination factors for many elements in the substoichiometric extraction of Ru/III/ were also evaluated. 相似文献
14.
A substoichiometric radiochemical solventextraction method is described for the determination of cobalt, employing β-hydroxy-naphthaldoxime
and chloroform as reagent and extractant, respectively. The extraction behaviour of the complex of cobalt with the reagent
in the pH-range 8–9.5 and the effects of various metal ions on the extraction are critically studied. The method is used to
determine the cobalt content in some pharmaceutical drugs.
Received: 10 January 1997 / Revised: 11 March 1997 / Accepted: 25 March 1997 相似文献
15.
Recently, R??I?KA et al. proposed a determination of zinc in highly pure germanium dioxide by a substoichiometric extraction technique. In the present work, the effects on the substoichiometric extraction of equilibrium time, pH and interfering ions were investigated by radioactive tracer techniques and spectrophotometric measurements. The sensitivity of the procedure is limited by the blanks and the addition of oxalate ions can give rise to inaccurate results. The specific activity of 65Zn was also determined by substoichiometric extraction. 相似文献
16.
A rapid and selective method has been developed for the extraction of W(VI) with rhodamine-B in nitrobenzene. The extraction coefficient value for the extraction between aqueous solution and nitrobenzene showed a maximum value of E=63 at a pH of 5.0. The stoichiometry of metal to reagent has been determined by the method of substoichiometric extraction and slope ratio method. 相似文献
17.
V. Jedináková-Křížová P. Vaňura 《Journal of Radioanalytical and Nuclear Chemistry》1996,208(1):99-109
Selectivity of isotope dilution analysis with substoichiometric separation for caesium determination has been investigated. Caesium can be extracted with a substoichiometric amounts of bis 1,2-dicarbollylcobaltate in nitrobenzene in the presence of dibenzo-18-crown-6. The method is selective. Other metal ions (K+, Na+, Mg2+, Ca2+, Fe3+, Al3+) do not interfere. 相似文献
18.
T. Kambara J. Suzuki H. Yoshioka N. Nakajima 《Journal of Radioanalytical and Nuclear Chemistry》1978,43(1):139-146
Isotope dilution analysis using the redox substoichiometric principle has been applied to the determination of antimony content
in metallic zinc. As the substoichiometric reaction, the oxidation of trivalent to pentavalent antimony with potassium permanganate
was used, followed by separation of these species by the BPHA extraction of trivalent antimony. Determination of antimony
contents less than 0.5 μg was found to be possible with good accuracy, without separation of zinc ions. The antimony content
in metallic zinc was determined to be 19.7±0.8 ppm, in good agreement with the results obtained by the other analytical methods. 相似文献
19.
A method has been developed for the extraction of Au(III) with 2-mercaptobenzimidazole into n-butanol.199Au has been used as a tracer for establishing the ideal extraction parameters such as effect of pH, time of equilibration,
solvents and anions. Separation factor and decontamination factor have also been evaluated to determine the selectivity of
the method with respect to various elements. The interfering elements were suppressed by the use of suitable masking agents
which increased the selectivity. The stoichiometry of metal to reagent was determined by the method of substoichiometric extraction
and slope ratio method. 相似文献
20.
1,2,3-Benzotriazole/1,2,3-BT/ has been used for the extraction of Cu/II/ into chloroform. The effect of various parameters on the extraction coefficient of Cu/II/ was evaluated. The stoichiometry of metal:reagent, determined by the method of substoichiometric extraction and slope ratio was found to be 12. Separation factor for a number of elements in the extraction of Cu/II/ has been evaluated. 相似文献