scholarly journals Sample preparation and analytical techniques for determination of polyaromatic hydrocarbons in soils

2005 ◽  
Vol 2 (3) ◽  
pp. 275-286 ◽  
Author(s):  
Z. Khan ◽  
J. Troquet ◽  
C. Vachelard
Keyword(s):  
Sample Preparation ◽  
Polyaromatic Hydrocarbons ◽  
Analytical Techniques ◽  
Hydrocarbons In Soils

scholarly journals Analytical and Sample Preparation Techniques for the Determination of Food Colorants in Food Matrices

Foods ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 58 ◽  
Author(s):  
Konstantina Ntrallou ◽  
Helen Gika ◽  
Emmanouil Tsochatzis
Keyword(s):  
Sample Preparation ◽  
Food Industry ◽  
Analytical Techniques ◽  
Food Product ◽  
Food Matrix ◽  
Nutritional Properties ◽  
Food Colorants ◽  
Food Matrices ◽  
Preparation Techniques

Color additives are widely used by the food industry to enhance the appearance, as well as the nutritional properties of a food product. However, some of these substances may pose a potential risk to human health, especially if they are consumed excessively and are regulated, giving great importance to their determination. Several matrix-dependent methods have been developed and applied to determine food colorants, by employing different analytical techniques along with appropriate sample preparation protocols. Major techniques applied for their determination are chromatography with spectophotometricdetectors and spectrophotometry, while sample preparation procedures greatly depend on the food matrix. In this review these methods are presented, covering the advancements of existing methodologies applied over the last decade.

The Determination of Quartz in Perlite by X-ray Diffraction

1989 ◽  
Vol 33 ◽  
pp. 493-497 ◽  
Author(s):  
R. D. Hamilton ◽  
N. G. Peletis
Keyword(s):  
Detection Limit ◽  
Sample Preparation ◽  
Accurate Determination ◽  
Analytical Techniques ◽  
Crystalline Silica ◽  
X Ray Diffraction ◽  
X Ray ◽  
Precision And Accuracy ◽  
Improved Technique

AbstractIARC's designation of crystalline silica as a “probable carcinogen” triggered the requirement to label products containing greater than 0.1 % crystalline silica. For perlite and other materials which may contain crystalline silica in levels close to 0.1% an accurate determination is critical from both legal and marketing considerations.Existing analytical techniques for the determination of crystalline silica at levels of less than 1.0% were found to be inadequate to meet the new requirements. An improved technique based on x-ray diffraction has been developed specifically to analyze perlite for crystalline silica, which occurs largely in the form of quartz, at the 0.1%. level. The technique employs long counting times and improved sample preparation and mounting to increase both precision and accuracy, and to lower the detection limit to less than 0.1%.The technique was tested on a large number of samples from a variety of sources and proven to give excellent results for all types of expanded perlites and perlite ores. The procedures developed are applicable to a wide variety of materials in addition to perlite.

scholarly journals Methodologies and Results Concerning the Determination of Ocs And Pcbs From Fish Meat

2018 ◽  
Vol 75 (2) ◽  
pp. 109
Author(s):  
Ana-Andreea CIOCA ◽  
Olaf HEEMKEN ◽  
Liora Mihaela COLOBATIU ◽  
Marian MIHAIU
Keyword(s):  
Sample Preparation ◽  
Food Chain ◽  
Third World ◽  
Analytical Techniques ◽  
Fish Food ◽  
Chemical Substances ◽  
Fish Meat ◽  
The World ◽  
Preparation Techniques

In the last decade, studies have been focusing on determinations of persistent organic pollutants (POPs), well known for being involved in human chronic diseases. Various approaches and methodologies are used in monitoring these chemical substances in fish food chain. Therefore, their development, functionality and efficiency are vital for consumers’ protection. The aim of this paper is to review recently published analytical techniques for sample preparation in the determination of POP residues such as organochlorine compounds (OCs) and polychlorinated biphenyls (PCBs). Limitations and advantages of sample preparation techniques are discussed and compared so that they can facilitate the decision of future analysts upon adequate protocols in individual laboratories. A list of the most common compounds quantified nowadays is displayed. In addition, results achieved in original papers are used to briefly describe the current situation on different continents, with third world countries undergoing more pollution than the rest of the world.

scholarly journals APLIKASI ANALISIS KIMIA KUANTITATIF UNTUK PEMANTAUAN KADAR OBAT (THEURAPETIC DRUGS MONITORING)

2019 ◽  
Vol 1 (1) ◽  
pp. 6-10
Author(s):  
Ni Made Amelia Ratnata Dewi
Keyword(s):  
Drug Therapy ◽  
Sample Preparation ◽  
Therapeutic Effect ◽  
Analytical Techniques ◽  
Drug Analysis ◽  
Toxic Effects ◽  
Individual Drug ◽  
Clinical Laboratories ◽  
Drug Concentrations

Theurapetic drugs monitoring (TDM) is used to adjust individual drug therapy. TDM purpose is to maximize the therapeutic effect and reduce the side or toxic effects of the drug. In general, TDM includes sample preparation, conducting drug analysis and interpreting the concentration of the drug. The development of analytical techniques resulted in the determination of pharmacokinetic characters by measuring drug concentrations in the blood more easily. Drug analysis can be done by spectrophotometric, chromatographic or immunoassay methods. Immunoassay could provide fast results and easy to use, but this method cannot distinguish between drugs that have similar structures. In addition, immunoassays are not available for all drugs monitored in clinical laboratories, so chromatographic methods such as GC, HPLC, GC/MS, and HPLC / MS can still be applied to TDM.

scholarly journals Benzene, toluene, ethylbenzene, and xylene: Current analytical techniques and approaches for biological monitoring

2020 ◽  
Vol 39 (1) ◽  
pp. 168-187
Author(s):  
Esmaeel Soleimani
Keyword(s):  
Sample Preparation ◽  
Biological Monitoring ◽  
Analytical Methods ◽  
Analytical Techniques ◽  
Urinary Metabolites ◽  
Extraction Methods ◽  
Exhaled Air ◽  
Occupationally Exposed ◽  
Benzene Toluene

Abstract Benzene, toluene, ethylbenzene, and xylene (BTEX) are a group of volatile organic compounds that human exposure to them may result in the development of some diseases, including cancer. Biological monitoring plays an important role in exposure assessment of workers occupationally exposed to chemicals. Several metabolites have been proposed for biological monitoring of individuals who are exposed to BTEX. There are a variety of extraction methods and analytical techniques for the determination of unmetabolized BTEX in exhaled air and their urinary metabolites. The present study aimed to summarize and review the toxicokinetics of BTEX and sample preparation and analytical methods for their measurement. Metabolites of BTEX are discussed to find out reliable ones for biological monitoring of workers exposed to these chemicals. In addition, analytical methods for unmetabolized BTEX in exhaled air and their metabolites were reviewed in order to obtain a comparison between them in term of selectivity, sensitivity, simplicity, time, environmental-friendly and cost. Given the recent trends in sample preparation, including miniaturization, automation, high-throughput performance, and on-line coupling with analytical instrument, it seems that microextraction techniques, especially microextraction by packed sorbents are the methods of choice for the determination of the BTEX metabolites.

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