Journal ArticleDOI
Spectrophotometric determination of trace molybdenum in plants and seeds with 3,5-dibromo-4-hydroxyphenylflurone.
Zaijun Li,Jiaomai Pan,Tang Jan +2 more
TLDR
3,5-Dibromo-4-hydroxyphenylflurone showed outstanding analytical characteristics for spectrophotometric determination of molybdenum, and has very high sensitivity and selectivity.Abstract:
A novel spectrophotometric method based on a new reagent,
3,5-dibromo-4-hydroxyphenylflurone, was developed for the determination of
molybdenum in plants and seeds. 3,5-Dibromo-4-hydroxyphenylflurone showed
outstanding analytical characteristics for spectrophotometric determination
of molybdenum. The reaction conditions are simple and stable. In 0.2 mol
l−1 phosphoric acid medium (which can combine with iron
and other metal ions and greatly improves the selectivity of the color
system), molybdenum(VI) reacts with
3,5-dibromo-4-hydroxyphenylflurone to form a 1∶2 red complex with an
absorption maximum at 530 nm, the color reaction can completed in 2 min and
the absorbance of the molybdenum complex remains stable for at least 72 h
at room temperature. Its stability constant is 1.21 × 1028
at 25 °C. Beer’s law is obeyed over the range 0–0.6 μg
ml−1 Mo(VI). The reagent has very high
sensitivity and selectivity; the molar absorptivity of the complex is 1.35
× 105 l mol−1 cm−1 and
the limit of quantification, the limit of detection and relative standard
deviation (n = 10) were found to be 6.7 ng ml−1,
2.2 ng ml−1 and 1.01%, respectively. Cu (50000-fold), Fe
(20000-fold), K (20000-fold), NH4+ (20000-fold), Mg
(15000-fold), Zn (10000-fold), Na (10000-fold), Al (4000-fold), Ca
(25000-fold), Mn (2000-fold), Ce (500-fold), Cr (400-fold) and Bi
(200-fold) do not interfere with the determination of trace levels of
molybdenum up to the excesses indicated. The selectivity is much superior
to that of other published methods. The proposed method was applied to the
direct determination of molybdenum in plants and seeds with satisfactory
results. The synthesis of the reagent and conditions of color reaction were
studied in detail.read more
Citations
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Journal ArticleDOI
Solid phase extraction and preconcentration of uranium(VI) and thorium(IV) on Duolite XAD761 prior to their inductively coupled plasma mass spectrometric determination.
TL;DR: The developed solid phase extraction method was successively utilized for the determination of traces thorium(IV) and uranium(VI) in environmental samples by ICP-MS.
Journal ArticleDOI
A convenient preparation of xanthene dyes.
Youjun Yang,Jorge O. Escobedo,Alex Wong,Corin M. Schowalter,Michael C. Touchy,Lijuan Jiao,William E. Crowe,Frank R. Fronczek,Robert M. Strongin +8 more
TL;DR: A facile synthetic route utilizing readily available reagents affords a series of regioisomerically pure xanthene dye derivatives, avoiding the need for relatively inefficient oxidation chemistry and/or harsh conditions.
Journal ArticleDOI
Cloud-point preconcentration and spectrophotometric determination of trace amounts of molybdenum(VI) in steels and water samples.
TL;DR: A cloud-point extraction process using micelle of the cationic surfactant CTAB to extract Mo(VI) from aqueous solutions was investigated and the analytical characteristics of the method obtained.
Journal ArticleDOI
A New Synthetic Route to Unsymmetrical 9-Arylxanthenes
TL;DR: In this paper, a facile and general three-step synthetic route towards unsymmetrical 9-arylxanthenes was developed, which involves nucleophilic substitution of commercially available 2-fluorobenzaldehydes with arenoxides, Grignard reaction of the resulting 2-arenoxybenzaldehes with arylmagnesium bromides, followed by FeCl3-catalyzed intramolecular diarylmethylation of resulting carbinols.
Journal ArticleDOI
Spectrophotometric determination of molybdenum with Alizarin Red S in the presence of poly(sulfonylpiperidinylmethylene hydroxide).
TL;DR: The interference effects of the foreign cations have been examined and it has been determined that only Cu(II), Al(III, and Fe(III) have to be masked by EDTA and tungsten can be tolerated till 4-fold of molybdenum in case of masking by citrate.
References
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Journal ArticleDOI
Guidelines for data acquisition and data quality evaluation in environmental chemistry
Guidelines for Data Acquisition and Data Quality Evaluation in Environmental Chemistry ACS COMMITTEE ON ENVIRONMENTAL IMPROVEMENT
Daniel MacDougall,Dow Pharmaceuticals-Canada,Goodyear Tire,Francis J. Amore,Geraldine V. Cox,Technical Vice President,Donald G. Crosby,Francis L. Estes,David H. Freeman,William E. Gibbs,Glen E. Gordon,Ralph R. Langner,Nina I. McClelland,Wendell F. Phillips,Robert B. Pojasek,Robert E. Sievers,Robert G. Smerko +16 more
Journal ArticleDOI
Spectrophotometric and second-derivative spectrophotometric determination of mercury in organomercurials by means of benzyl 2-pyridyl ketone 2-quinolylhydrazone.
Medinilla J,Ales F,Sanchez Fg +2 more
TL;DR: The sensitivity of the method can be increased significantly by employing derivative spectrophotometry, making mercury determination at ng ml levels feasible.
Journal ArticleDOI
Analytical applications of ternary complexes-VII Elucidation of mode of formation of sensitized metal-chelate systems and determination of molybdenum and antimony.
TL;DR: Spectrophotometric measurements indicate that true ternary complexes are formed with well defined structures and that the changes in absorption spectra produced are not due to simple adsorption of the binary metal-dye complex onto micellar aggregates.
Journal ArticleDOI
Liquid-liquid extraction of molybdenum thiocyanate with hexamethyl phosphortriamide and direct spectrophotometric determination in the organic phase.
TL;DR: A sensitive and selective method for estimation of trace molybdenum with fairly common reagents has been developed and is generally free from interference by most of the metals commonly associated with moly bdenum, including rhenium.
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