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Flow Injection/Atomic Absorption Spectrometric Determination of Zineb in Commercial Formulations of Pesticide Based on Slurry Sampling.
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- CASSELLA Ricardo J.
- CEFETEQ/RJ
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- SALIM Verônica A.
- Departamento de Geoquímica, Universidade Federal Fluminense
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- GARRIGUES Salvador
- Departamento de Química Analítica, Universidad de Valencia
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- SANTELLI Ricardo E.
- Departamento de Geoquímica, Universidade Federal Fluminense
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- de la GUARDIA Miguel
- Departamento de Química Analítica, Universidad de Valencia
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Description
This paper reports on a new strategy for the slurry sampling determination of dithiocarbamate pesticide zineb {[ethylenebis(dithiocarbamato)]zinc} employing a FIA system with a flame atomic absorption spectrometry detector. In the flow system, an on-line alkaline hydrolysis of the pesticide is performed, allowing the release of Zn(II) ions to the solution, which are easily detected by a flame AAS technique. Several parameters that could affect the performance of the analytical methodology were studied, such as the concentration of NH3(aq) used in the hydrolysis step, the effect of the presence of Triton X-100 on the sensitivity and precision, and the FIA parameters (carrier flow rate and mixing coil volume). Under optimized conditions, aqueous slurries containing 2.5 to 25 μg ml-1 zineb provided good linear calibration fits. From the obtained data, a detection limit (3σ) of 1.0 μg ml-1 zineb was found and a repeatability of 2.7% was obtained from 12 measurements of a slurry containing 2.5 μg ml-1 zineb. On the other hand, a precision (reproducibility) of 7.8% was achieved from three determinations of a sample containing 128 mg g-1 of the pesticide. Also, the developed system provides a sampling frequency of 72 h-1.
Journal
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- Analytical Sciences
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Analytical Sciences 18 (11), 1253-1256, 2002
The Japan Society for Analytical Chemistry
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Details 詳細情報について
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- CRID
- 1390282679232618752
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- NII Article ID
- 130004440493
- 10011310344
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- NII Book ID
- AA10500785
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- COI
- 1:CAS:528:DC%2BD38XovVOgtrY%3D
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- ISSN
- 13482246
- 09106340
- http://id.crossref.org/issn/09106340
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- NDL BIB ID
- 6354339
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- PubMed
- 12458712
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- JaLC
- NDL Search
- Crossref
- PubMed
- CiNii Articles
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- Abstract License Flag
- Disallowed