A closed inline system for sample digestion using 70% hydrogen peroxide and UV radiation. Determination of lead in wine employing ETAAS

Cruz, Raineldes A.; Chagas, Adriano V.B.; Felix, Caio S.A.; Souza, Rosemario C.; Silva, Luciana da; Lemos, Valfredo Azevedo; Ferreira, Sérgio L.C.

doi:10.1016/j.talanta.2018.08.085

Cited by 10 publications

(2 citation statements)

References 47 publications

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“…The preconcentration system containing a 500 mg mini-column of IIP-U(VI) was constructed for the determination of uranium in natural waters using digital imaging. The experimental variables sample pH, eluent concentration, and sampling flow were optimized using a two-level full factorial design [ 43 , 44 , 45 , 46 , 47 ] and a Doehlert matrix [ 41 , 43 , 48 ]. The experimental domains as coded and actual values of these factors established in the factorial design are shown in Table 2 .…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Application of a New Polymer with Imprinted Ions for the Preconcentration of Uranium in Natural Water Samples and Determination by Digital Imaging

et al. 2023

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This work proposes the synthesis of a new polymer with imprinted ions (IIP) for the pre-concentration of uranium in natural waters using digital imaging as a detection technique. The polymer was synthesized using 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (Br-PADAP) for complex formation, ethylene glycol dimethacrylate (EGDMA) as a crosslinking reagent, methacrylic acid (AMA) as functional monomer, and 2,2′-azobisisobutyronitrile as a radical initiator. The IIP was characterized by Fourier transform infrared spectroscopy and scanning electron microscopy (FTIR). Uranium determination was performed using digital imaging (ID), and some experimental conditions (sample pH, eluent concentration, and sampling flow rate) were optimized using a two-level full factorial design and Doelhert response surface methodology. Thus, using the optimized conditions, the system allowed the determination of uranium with detection and quantification limits of 2.55 and 8.51 µg L−1, respectively, and a pre-concentration factor of 8.2. All parameters were determined using a 25 mL sample volume. The precision expressed as relative deviation (RSD%) was 3.5% for a solution with a concentration of 50 µg L−1. Given this, the proposed method was used for the determination of uranium in four samples of natural waters collected in the city of Caetité, Bahia, Brazil. The concentrations obtained ranged from 35 to 75.4 μg L−1. The accuracy was evaluated by the addition/recovery test, and the values found ranged between 91 and 109%.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Application of a New Polymer with Imprinted Ions for the Preconcentration of Uranium in Natural Water Samples and Determination by Digital Imaging

et al. 2023

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“…The analytical technique of graphite furnace atomic absorption spectrophotometry (GFAAS) allows reducing the detection limits to the parts per billion (ppb) range with a relatively simple instrumentation, without so much effort and loss of time that previous extraction techniques entail, however, one of its disadvantages is a lower precision, Another disadvantage is that graphite furnace atomic absorption spectrophotometry (GFAAS) incurs a greater number of interferences. [23] The analytical technique of graphite furnace atomic absorption spectrophotometry (GFAAS) has a higher sensitivity compared to the analytical technique of flame atomic absorption spectrophotometry (FAAS), which is the second most used method, because levels of ng/L can be detected. Comparing both methods of analysis, it was observed that flame offers results in shorter times, allows working with larger sample volumes and interferences are lower.…”

Section: Analytical Technique Usedmentioning

confidence: 99%

Analytical Techniques for The Evaluation of Lead Concentrations in Food for Human Consumption

2021

cibg

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In the present work, a review was carried out on the studies carried out in different parts of the world, on the analysis techniques used to evaluate the concentrations of lead in various products for human consumption. A review was made of 25 arbitrary scientific articles from three databases SCOPUS, Science direct and Google academic, published from 2016 to February 2021, identifying 15 countries of origin, the country with the highest number of publications was the results with the Codex quality standard.

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Microwave‐Assisted Sample Preparation for Spectrochemical Analysis

Nóbrega,

Donati

2024

Encyclopedia of Analytical Chemistry

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Microwave‐assisted sample preparation has represented a major developmental step in combining the overall quality and speed of spectrochemical analysis with the initial analytical step of converting solid samples into representative solutions. Instrumentation and applications involving samples with organic and inorganic matrices are discussed in detail after briefly addressing the fundamentals of the method. The feasibility of using diluted acid solutions and pressurized oxygen vessels for sample digestion is rationalized and clearly related to advances in reaction vessel materials and the interaction between matter and microwave radiation. Applications based on microwave‐induced combustion (MIC) and procedures developed for chemical speciation are also highlighted. A list of ideal attributes for microwave‐assisted sample preparation is proposed and evaluated considering the state of the art. Major needs, mainly related to the capacity of digesting large sample masses and improvements in sample throughput, are also highlighted.

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A closed inline system for sample digestion using 70% hydrogen peroxide and UV radiation. Determination of lead in wine employing ETAAS

Cited by 10 publications

References 47 publications

Synthesis and Application of a New Polymer with Imprinted Ions for the Preconcentration of Uranium in Natural Water Samples and Determination by Digital Imaging

Synthesis and Application of a New Polymer with Imprinted Ions for the Preconcentration of Uranium in Natural Water Samples and Determination by Digital Imaging

Analytical Techniques for The Evaluation of Lead Concentrations in Food for Human Consumption

Microwave‐Assisted Sample Preparation for Spectrochemical Analysis

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