scholarly journals A new approach for the determination of sunscreen levels in seawater by ultraviolet absorption spectrophotometry

PLoS ONE ◽  
2020 ◽  
Vol 15 (12) ◽  
pp. e0243591
Author(s):  
Antonio Tovar-Sánchez ◽  
Erica Sparaventi ◽  
Amandine Gaudron ◽  
Araceli Rodríguez-Romero
Keyword(s):  
Marine Environment ◽  
Spectrophotometric Method ◽  
Analytical Methods ◽  
Low Cost ◽  
Sample Pretreatment ◽  
New Approach ◽  
Spectrophotometric Procedure ◽  
Marine Life ◽  
Absorption Spectrophotometry

Sunscreen is released into the marine environment and is considered toxic for marine life. The current analytical methods for the quantification of sunscreen are mostly specific to individual chemical ingredients and based on complex analytical and instrumental techniques. A simple, selective, rapid, reproducible and low-cost spectrophotometric procedure for the quantification of commercial sunscreen in seawater is described here. The method is based on the inherent properties of these cosmetics to absorb in the wavelength of 300–400 nm. The absorption at 303 nm wavelength correlates with the concentration of most commercial sunscreens. This method allows the determination of sunscreens in the range of 2.5–1500 mg L-1, it requires no sample pretreatment and offers a precision of up to 0.2%. The spectrophotometric method was applied to quantify sunscreen concentrations at an Atlantic Beach with values ranging from 10 to 96.7 mg L-1 in the unfiltered fraction and from the undetectable value to 75.7 mg L-1 in the dissolved fraction. This method is suggested as a tool for sunscreen quantifications in environmental investigations and monitoring programs.

scholarly journals Simultaneous determination of iron and copper in children's sera by FAAS

2011 ◽  
Vol 61 (1) ◽  
pp. 93-102 ◽  
Author(s):  
Svjetlana Luterotti ◽  
Tončica Kordić ◽  
Slavica Dodig
Keyword(s):  
Atomic Absorption ◽  
Simultaneous Determination ◽  
Sample Pretreatment ◽  
Single Step ◽  
Design Experiment ◽  
New Approach ◽  
Flame Atomic Absorption ◽  
Reference Methods ◽  
Atomic Absorption Spectrometric

Simultaneous determination of iron and copper in children's sera by FAASA new and simple flame atomic-absorption spectrometric (FAAS) method is proposed for simultaneous determination of iron and copper in children's sera. It is based on single-step sample pretreatment (deproteinization with 3 mol L-1HCl, ratio 1:1) and single-step calibration using 1.5 mol L-1HCl standard. During method's optimization a short multifactorial design experiment was used. The proposed method assures accuracy, sensitivity and precision comparable to that of the reference methods. The new approach is simple and time-, labour- and serum-saving, the latter being especially important in pediatric diagnostics.

Collaborative Study Using Atomic Absorption Spectrophotometry for the Determination of Copper in Alcoholic Products

1967 ◽  
Vol 50 (2) ◽  
pp. 338-339
Author(s):  
Duane H Strunk ◽  
A A Andreasen
Keyword(s):  
Atomic Absorption ◽  
Spectrophotometric Method ◽  
Collaborative Study ◽  
Atomic Absorption Spectrophotometry ◽  
Good Precision ◽  
Absorption Method ◽  
Standard Curve ◽  
Absorption Spectrophotometry ◽  
Determination Of Copper

Abstract A collaborative study was conducted on the 'atomic absorption spectrophotometric method for measuring the concentration of copper in alcoholic products. In this method, the samples are aspirated directly into the burner of the instrument, and the absorhance values are converted to ppm copper by reference to a standard curve. Data show good precision and are comparable to those obtained by the ZDBT method. It is recommended that the atomic absorption method be adopted as official, first action.

Atomic Absorption Spectrophotometric Method for Determination of Polydimethylsiloxane Residues in Pineapple Juice: Collaborative Study

1990 ◽  
Vol 73 (5) ◽  
pp. 721-723
Author(s):  
Robert D Parker
Keyword(s):  
Nitrous Oxide ◽  
Atomic Absorption ◽  
Spectrophotometric Method ◽  
Collaborative Study ◽  
Atomic Absorption Spectrophotometry ◽  
Pineapple Juice ◽  
Absorption Spectrophotometry ◽  
Relative Standard ◽  
Standard Deviations

Abstract An atomic absorption spectrophotometric method for determination of polydimethylsiloxane (PDMS) residues In pineapple juice was collaboratively studied by 9 laboratories. PDMS residues are extracted from pineapple Juice with 4- methyl-2-pentanone and the extracted silicone Is measured by atomic absorption spectrophotometry using a nitrous oxide/ acetylene flame. Collaborators analyzed 5 samples Including 1 blind duplicate. Reproducibility relative standard deviations (RSDR) were 13.1% at 31 ppm, 6.9% at 18 ppm, 14.8% at 7.9 ppm, and 16.1 % at 4.9 ppm PDMS. The method has been approved Interim official first action by AOAC.

scholarly journals Studies on complex formation between curcumin and Hg(II) ion by spectrophotometric method: A new approach to overcome peak overlap

2009 ◽  
Vol 7 (3) ◽  
pp. 388-394 ◽  
Author(s):  
Ratanasuda Waranyoupalin ◽  
Sumpun Wongnawa ◽  
Malinee Wongnawa ◽  
Chaveng Pakawatchai ◽  
Pharkphoom Panichayupakaranant ◽  
...  
Keyword(s):  
Complex Formation ◽  
Spectrophotometric Method ◽  
Equilibrium Concentration ◽  
Chloride Ions ◽  
Tetrahedral Complex ◽  
Microsoft Excel ◽  
New Approach ◽  
Peak Overlap ◽  
Linear Plot

AbstractComplex formation between curcumin and Hg(II) ion MeOH/H2O (1: 1 v/v) was investigated and monitored by the spectrophotometric method. The absorption peak of unreacted curcumin which was close and overlapped with that of the complex, was removed by calculation using Microsoft Excel, thereby, allowing determination of the stoichiometry of the complex by the mole-ratio and the Job’s continuous variation methods. Both methods indicated that a 1:1 complex of curcumin and Hg(II) was formed in solution. The formation constant of the 1:1 Hg(II) complex was obtained from two methods, the equilibrium concentration calculation and the linear plot of Benesi-Hildebrand equation, as log K = 4.44 ± 0.16 and 4.83 ± 0.02, respectively. The structure is proposed as a tetrahedral complex of Hg(II) with one curcumin and two chloride ions as ligands.

scholarly journals Nanoadsorbents for the Preconcentration of some Toxic Substances: A Minireview

2013 ◽  
Vol 21 ◽  
pp. 22-35 ◽  
Author(s):  
Shivender Singh Saini ◽  
Anupreet Kaur
Keyword(s):  
Critical Review ◽  
Analytical Methods ◽  
Solid Phase ◽  
Sample Pretreatment ◽  
Literature Survey ◽  
Toxic Substances ◽  
Analyte Enrichment ◽  
Low Levels ◽  
Solid Phase Extractant

The development of new sorbents and their application in preconcentration methods for determination of trace analytes is subject of great interest. Sample pretreatment methods, such as separation/preconcentration prior to the determination of metal ions have developed rapidly due to the increasing need for accurate and precise measurements at extremely low levels of ions in diverse matrices. This review summarizes and discusses several analytical methods involving the preparation and use of new solid phase extractant. A literature survey of the last ten years offering a critical review of these new sorbents available for use in trace analyte enrichment is provided.

scholarly journals A Review of the Analytical Methods for the Determination of 4(5)-Methylimidazole in Food Matrices

Chemosensors ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 322
Author(s):  
Panagiota-Kyriaki Revelou ◽  
Marinos Xagoraris ◽  
Eleftherios Alissandrakis ◽  
Christos S. Pappas ◽  
Petros A. Tarantilis
Keyword(s):  
Mass Spectrometry ◽  
Analytical Methods ◽  
High Performance ◽  
Water Solubility ◽  
Solid Phase ◽  
Sample Pretreatment ◽  
Extraction Methods ◽  
Exchange Chromatography ◽  
Food Matrices

4(5)-Methylimidazole (4(5)MEI) is a product of the Maillard reaction between sugars and amino acids, which occurs during the thermal processing of foods. This compound is also found in foods with caramel colorants additives. Due to its prevalence in foods and beverages and its potent carcinogenicity, 4(5)MEI has received federal and state regulatory agency attention. The aim of this review is to present the extraction procedures of 4(5)MEI from food matrices and the analytical methods for its determination. Liquid and gas chromatography coupled with mass spectrometry are the techniques most commonly employed to detect 4(5)MEI in food matrices. However, the analysis of 4(5)MEI is challenging due to the high polarity, water solubility, and the absence of chromophores. To overcome this, specialized sample pretreatment and extraction methods have been developed, such as solid-phase extraction and derivatization procedures, increasing the cost and the preparation time of samples. Other analytical methods for the determination of 4(5)MEI, include capillary electrophoresis, paper spray mass spectrometry, micellar electrokinetic chromatography, high-performance cation exchange chromatography, fluorescence-based immunochromatographic assay, and a fluorescent probe.

A low cost and rapid analytical technique for direct spectrophotometric determination of chromium in V–Cr–Ti alloys without a chromogenic agent

2017 ◽  
Vol 9 (30) ◽  
pp. 4471-4475 ◽  
Author(s):  
L. F. Tian ◽  
D. S. Zou ◽  
Y. C. Dai ◽  
L. L. Wang ◽  
W. Gao
Keyword(s):  
Ternary Alloy ◽  
Spectrophotometric Determination ◽  
Spectrophotometric Method ◽  
Low Cost ◽  
Analytical Technique ◽  
Ti Alloys ◽  
Chromogenic Agent

A simple, rapid and accurate spectrophotometric method was developed for the determination of chromium in V–Cr–Ti ternary alloy without any prior separation and chromogenic agent.

Determination of PAHs in marine sediments: analytical methods and environmental concerns

2013 ◽  
Vol 11 (4) ◽  
pp. 391-405 ◽  
Keyword(s):  
Human Health ◽  
Marine Environment ◽  
Analytical Methods ◽  
Environmental Matrices ◽  
Priority List ◽  
Bathing Waters ◽  
Significant Research ◽  
Polycyclic Aromatic ◽  
Us Epa

Polycyclic Aromatic Hydrocarbons (PAHs) are one of the major categories of pollutants entering the marine environment and finally accumulating in the sediments. Their occurrence raises major concerns for human health, especially during coastal activities (bathing waters, aquaculture, etc), having combined adverse effects still largely unknown when they are present as mixtures. Moreover, during their remobilization (e.g. dredging activities), their bioavailability can increase resulting in a risk for marine environment. Several of them are known to be potential human carcinogens including benzo[a]anthracene, chrysene, benzo[b]fluoranthene, benzo[a]pyrene and benzo[ghi]perylene. Therefore they have been included in the priority list of the Water Framework Directive 2000/60/EC and also sixteen of them have been regulated by the US EPA as priority pollutants, and their distributions in the environment and potential human health risks have become the focus of much attention. The determination of PAHs in environmental matrices has been subject of great scientific attention during the latest years, as the accuracy and sensitivity of analytical methods need to be improved in order to be able to detect the compounds of interest in a complex matrix such as sediments. Therefore, significant research is being devoted to the optimization of analytical methodologies. A great number of studies have been performed on PAHs analysis in marine sediments. Various analytical procedures based on gas chromatographic analyses are reviewed and comparatively discussed in this paper.

scholarly journals Determination of ?iroctone Olamine (Octopirox) in Bulk by UV Spectrophotometric Method

2017 ◽  
Vol 16 (1) ◽  
pp. 37-42
Author(s):  
Lyudmyla M Antypenko ◽  
Vitaliy A Solodovnyk
Keyword(s):  
Spectrophotometric Method ◽  
Limit Of Detection ◽  
Low Cost ◽  
Limit Of Quantification

A simple and low-cost UV-spectrophotometric method has been developed and validated for the quantification of Octopirox in bulk. The linearity was found at 307 ± 1 nm in 10-50 ?g/ml solution of ethanol-water (1:3, v:v) with r2 = 0.99. The limit of detection was found to be 1.18 µg/ml, while the limit of quantification was 3.58 µg/ml. The method was validated for linearity, accuracy, precision, range, ruggedness and robustness.Dhaka Univ. J. Pharm. Sci. 16(1): 37-42, 2017 (June)

scholarly journals Validation of a UV-spectrophotometric analytical method for determination of LPSF/AC04 from inclusion complex and liposomes

2015 ◽  
Vol 51 (1) ◽  
pp. 183-191
Author(s):  
Rafaela Siqueira Ferraz ◽  
Elisângela Afonso Moura Mendonça ◽  
Jéssica Priscila Avelino Silva ◽  
Isabella Macário Ferro Cavalcanti ◽  
Mariane Cajubá Britto Lira-Nogueira ◽  
...  
Keyword(s):  
Inclusion Complex ◽  
Spectrophotometric Method ◽  
Analytical Method ◽  
Low Cost ◽  
Health Surveillance ◽  
Validation Parameters ◽  
Significant Difference ◽  
Detection And Quantification ◽  
Sensitive Spectrophotometric Method

The aim of this study was to develop and validate a UV spectrophotometric method for determination of LPSF/AC04 from inclusion complex and encapsulated into liposomes. The validation parameters were determined according to the International Conference on Harmonisation (ICH) and National Health Surveillance Agency (ANVISA) guidelines. LPSF/AC04 was determined at 250 nm in methanol by a UV spectrophotometric method, exhibiting linearity in the range from 0.3 to 2 µg.mL−1 (Absorbance=0.18068 x [LPSF/AC04 µg.mL-1] + 0.00348), (r2=0.9995). The limits of detection and quantification were 0.047µg.mL−1 and 0.143µg.mL−1, respectively. The method was accurate, precise, reproducible and robust since all the samples analyzed had coefficient of variation of less than 5% and no statistically significant difference between theoretical and practical concentrations was detected. Thus, a rapid, simple, low cost and sensitive spectrophotometric method was developed and validated for determining the content of inclusion complex and liposomes containing LPSF/AC04.

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